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13515 discussions

Re: can't see ~snapshot directory
by sirbruce＠ix.netcom.com 06 Nov '98

06 Nov '98

On 11/06/98 13:26:41 you wrote: >|> As I pointed out before, simply mounting .snapshot as it's own filesystem >|> on the client will resolve this problem. > > No it won't. > > The .snapshot will still be there and will still suffer this problem >when someone uses it. I'm not sure I follow you. If they use it from the seperate mountpoint, there won't be a problem. If they try to refer to the .snapshot in their own directory, sure, they'll still have the problem, but 1. They wouldn't know to look there if you told them to get it from /snapshot (for example), and 2. If they went ahead and used it anyway, they'd know what they were doing. > And it would leave me with another issue - how to setup automount >maps to do the actual mounts in some consistent way. Well, simply don't use automounter. It's evil anyway. (This is a religious war, though, so let's not get into it on this list.) Bruce

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Re: can't see ~snapshot directory
by sirbruce＠ix.netcom.com 06 Nov '98

06 Nov '98

On 11/06/98 11:50:43 you wrote: > Also, one thing that I would like to see changed (if it makes sense) >is for the NetApp servers to return different inodes for snapshot >entries (OR in teh snapshot number at the top-end?). The reason for >this is that some versions (egL GNU) of diff seem to check fs/inode >info, and if they find they are the same they don't bother to do any >diff'ing.... As I pointed out before, simply mounting .snapshot as it's own filesystem on the client will resolve this problem. Bruce

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Re: SMTP MIB (was Re: raid scrubbing and hot spares)
by mds＠ns.gbnet.net 06 Nov '98

06 Nov '98

I have to say I found it easier (marginally) to use the basic MRTG distribution and copy-in the useful bits from the NOW package - largely because it'd been prepared and tailored a leetle too much in NetApp 8) I, for example, wanted/needed to run it all on an SGI box, and the precompiled SPARC binaries weren't very useful in this instance (read HP/IBM/Linux/etc. if more apt). I'll have to do the same thing over again when I get the latest MIB. I'd kill to get my hands on the proper SNMP tools where I work, as it is I have to work far too hard to work out what variables do what to get even basic info out of any MIB. But that's just a general complaint about SNMP on my part. 8) MRTG is useful, but it's also very limited. I want to do some graphs which tie together the main characteristics of filer (network use, CPU, NVRAM-cache-flushes, cache-age, NFS-ops, CIFS-ops) on the same graphs - try to do that with just two variables. (Yes some of those are desirable but not currently reported - to the observant who spotted my imagination running away with my fingers). I also wanted to be able to graph all the per-client stats. But the problem we found there was that the filer only kept a table of 256 such stats, or at least that's all the we could get through SNMP. Per-volume, per-client stats, now that'd be interesting. Per-volume stats would be interesting. Per-disk stats, would be interesting, if slightly un-immediately-useful. Exposing more of the error- and performance-reporting from the disks would be fascinating too. You could graph that data over time to see if there's a disk that's being hot-spotted for some reason, or which is throwing up more low-level, otherwise hidden errors, or which is responding in a below-par relative to its siblings. You could move data around or pre-emptively maintain problems with such information. As the number of clients and disk increase, getting these stats might make the difference between running a silky-smooth operation with the filer or having disks blow randomly in quick succession in just the most critical sections of the filer, serving the most demanding clients - without even knowing such a relationship pertained. That's my Xmas wishlist on the topic. I'll be praying Santa listens to this one though.

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Re: SMTP MIB (was Re: raid scrubbing and hot spares)
by Elena Samsonova 06 Nov '98

06 Nov '98

Thompson, Tim wrote: > > > > The tools are at http://now.netapp.com/download/tools/filer-mrtg/ > > Yes, I know that, we use those tools and a lot more. > > What other tools do you find useful? (We're always interested > in finding out what people are using.) We wrote our own. We pull and parse the web interface pages of the NetCache Appliance, and I am currently writing one for parsing sysstat output from the filers (and perhaps NetCaches too). Regards Elena ---------------------------------------------------------------- Elena Samsonova e-mail: E.Samsonova(a)wxs.nl World Access / Planet Internet phone: +31 33 45 40 417 PO Box 2529, 3800 GB Amersfoort fax: +31 33 45 40 401 The Netherlands ----------------------------------------------------------------

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Re: hard link .snapshot files
by mds＠ns.gbnet.net 06 Nov '98

06 Nov '98

Actually this issue - of wanting to bring files from a snapshot back into the current filesystem, without raising the occupancy of the disks any more - is something that has crossed my mind before. There are times, for example, when it'd be nice to just bring back a large directory-tree into current use from a snapshot, perhaps/probably toasting anything in the current filesystem image that would name-clash but not having to freshly copy the data into new free blocks on the filer - perhaps because you are close to filling the filer already. Now if it's the total contents of the filer in question then you could take the filer down and use the requisite admin commands (perhaps with the help of the NetApp support folk) to use an older snapshot as your current filesystem image. 'Rolling back to a named consistency point' would be something akin to the NetApp way of putting it. However, I've often thought it'd be darned useful to say: 'take everything from this directory down from that snapshot and graft it coherently into place in the current filesystem here, but leave everything else as it is currently'. This is probably a great deal to ask and couldn't be done with normal filesystem operations, CIFS/NFS notwithstanding. However, as an option available to an admin I think it would be stunningly useful to some folk. This would take some cunning WAFL wizardry to accomplish I think, but it's not beyond the bounds of credibility. > As I'm sure you've already discovered, you can't create a hard link to a > file in a snapshot. The reason is that snapshots are read-only, but it is > necessary to increment the number of links in the linked-to inode. You can > use a symbolic link, of course, but it would point to whatever was at that > location. To prevent the snapshot from being recycled, you could do a "snap > rename" of hourly.0 or whatever to something else. > > Mark > > -----Original Message----- > From: Jim Harm <harm1(a)llnl.gov> > To: toasters(a)mathworks.com <toasters(a)mathworks.com> > Date: Thursday, November 05, 1998 8:56 AM > Subject: hard link .snapshot files > > > >We have the need to occasionally recover a LARGE file and we would like to > >recover it quickly without making the massive increase in space usage that > >would result if we merely copied the file from .snapshot to the old > directory. > > > >Can we build a hard link from the old directory to the > >.snapshot/hourly.#/Large.file and how will that be protected with the next > >snapshot? > > > >I don't want to screw anything up. Our users ARE rocket scientists. > > > >}}}===============>> LLNL > >James E. Harm (Jim); jharm(a)llnl.gov > >(925) 422-4018 Page: 423-7705x57152 > > > > > > >

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FW: ndmpcopy port for HP/UX
by Melvin, Grant 06 Nov '98

06 Nov '98

Hi, NDMPcopy for HP-UX clients available on NOW: http://now.netapp.com/tools/ [index pages] http://now.netapp.com/download/tools/ndmpcopy/ [tool page] [Thanks to Paul Albers & Doug Mendoza] Cheers, Grant

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Re: hard link .snapshot files
by Mark Muhlestein 05 Nov '98

05 Nov '98

As I'm sure you've already discovered, you can't create a hard link to a file in a snapshot. The reason is that snapshots are read-only, but it is necessary to increment the number of links in the linked-to inode. You can use a symbolic link, of course, but it would point to whatever was at that location. To prevent the snapshot from being recycled, you could do a "snap rename" of hourly.0 or whatever to something else. Mark -----Original Message----- From: Jim Harm <harm1(a)llnl.gov> To: toasters(a)mathworks.com <toasters(a)mathworks.com> Date: Thursday, November 05, 1998 8:56 AM Subject: hard link .snapshot files >We have the need to occasionally recover a LARGE file and we would like to >recover it quickly without making the massive increase in space usage that >would result if we merely copied the file from .snapshot to the old directory. > >Can we build a hard link from the old directory to the >.snapshot/hourly.#/Large.file and how will that be protected with the next >snapshot? > >I don't want to screw anything up. Our users ARE rocket scientists. > >}}}===============>> LLNL >James E. Harm (Jim); jharm(a)llnl.gov >(925) 422-4018 Page: 423-7705x57152 > > >

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Re: can't see ~snapshot directory
by Tom Reingold 05 Nov '98

05 Nov '98

On Thu, 05 Nov 1998 08:01:57 CST, David Drum <david(a)more.net> wrote: > I find it disgusting that NetApp caters to Microsoft's ineptitude. Let's be fair. snapshots are strange. They are links to files, but they appear to be duplicates. We had to provide our unix users with a new "du" command so it wouldn't traverse snapshots. How could Microsoft have foreseen this problem and written their apps accordingly? -- Tom Reingold tommy(a)bell-labs.com http://www.bell-labs.com/~tommy The problem with this world is that there's too much apathy. But I don't really care.

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Re: can't see ~snapshot directory
by Tom Reingold 05 Nov '98

05 Nov '98

On Thu, 05 Nov 1998 11:05:26 PST, "Chad H. Tudor" <chtudor(a)stanford.edu> wrote: > : find . -name .snapshot -prune -o -print > > While this is really helpful; the find would not be for me, as I do > understand how find operates and more importantly I understand the command > man 'splat'. What I do have is a shop full of folks who do not and it > would be easier if I could point them to a specific biniary. I betcha it would be trivial to take the source code for gnu find and put in a rule never to traverse a directory by a given name. -- Tom Reingold tommy(a)bell-labs.com http://www.bell-labs.com/~tommy Bell Labs, the Research and Development unit of Lucent Technologies Murray Hill, NJ, 07974-0636 US

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Re: can't see ~snapshot directory
by Tom Reingold 05 Nov '98

05 Nov '98

On Thu, 05 Nov 1998 09:54:20 PST, "Chad H. Tudor" <chtudor(a)stanford.edu> wrote: > :Let's be fair. snapshots are strange. They are links to files, but > :they appear to be duplicates. We had to provide our unix users with > :a new "du" command so it wouldn't traverse snapshots. > > This raises another question. > > Would there be a find laying about that ignores same? find . -name .snapshot -prune -o -print

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Re: can't see ~snapshot directory
by David Drum 05 Nov '98

05 Nov '98

Quoth Mark Muhlestein: > Huh? This change only affects CIFS clients. *ouch* I guess I missed that in the original poster's email. Sorry. Regards, David K. Drum david(a)more.net -- It's hard to be bored when you're as stupid as a line. [1] Reality has a tendency to be so uncomfortably real. [2] When you proceed deliberately, mistakes don't cascade, they instruct. [3] What you notice becomes your life. [4] [1] Vernor Vinge [2] Neil Peart [3] Stewart Brand [4] Michael Chitwood

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Re: can't see ~snapshot directory
by Tom Reingold 05 Nov '98

05 Nov '98

On Thu, 05 Nov 1998 11:21:38 CST, David Drum <david(a)more.net> wrote: > I will admit that file system theory is not that different from UNIX > to PC. Therefore you are correct. My question then is: Why is this > only a problem now? How were UNIX users able to manage with one default > behavior all this time? Why can't the CIFS users just RTFM and configure > the NetApp so that it works the way they need? NetApp is thumbing its > nose at the installed base of (UNIX) users, who will now have to restore > the old default configuration. Just my Microsoft rant of the day. We mount each user's home directory as /home/whatever, so it does actually cause a problem (with things such as du). That is to say it's a problem for both PC and UNIX users. You could argue that the solution should be on the client side, but until that comes, it's nice that the server offers us an option. But you can't argue that Windows is more broken than UNIX in this case.

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Re: Dual home fiber
by Gilbert Smith 05 Nov '98

05 Nov '98

At 10:13 AM 11/5/98 +0000, Algar, Christopher [PAI01:8881:EXCH] wrote: >Greetings. > >I'm having a bit of difficulty configuring a F760 with two fiber cards on >different sub nets. >It's been running fine with ifconfig f3 `hostname`-f3 netmask 255.255.240.0 >I've tried adding a similar line to etc/rc for f1 explicitly stating the IP >address instead of hostname, installing the additional card in slot 1 and >rebooting. Also tried installing the card with no changes to rc and >rebooting. >The result is the same, the system panics and fails to boot. > >Can anyone help? I would try floppy boot using option (no /etc/rc, I think #2 from the menu). Then run command, "sysconfig -v" and examine the output. Do you see both cards listed in the sysconfig output and are the two cards identical? Now run command "setup" and answer the questions. Setup will keep a backup copy of all your /etc/?? config files like (/etc/rc, /etc/exports, /etc/hosts, etc.). But setup should choose the appropriate mediatype and build the correct rc file for your hardware. There is a mediatype argument to the ifconfig command. The panic messge you receive might help. Hope this helps, Gil

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Re: can't see ~snapshot directory
by sirbruce＠ix.netcom.com 05 Nov '98

05 Nov '98

On 11/05/98 11:39:35 you wrote: > > >On Thu, 05 Nov 1998 08:01:57 CST, > David Drum <david(a)more.net> wrote: > >> I find it disgusting that NetApp caters to Microsoft's ineptitude. > >Let's be fair. snapshots are strange. They are links to files, but >they appear to be duplicates. We had to provide our unix users with >a new "du" command so it wouldn't traverse snapshots. > >How could Microsoft have foreseen this problem and written their apps >accordingly? The real problem, IMHO, is that the snapshots should be treated as their own seperate partition, and be mounted as such, rather than inserting .snapshot directories. Of course, this does make it a little more difficult to explain to the user where to go to get their files, and with NFS it necessitates lots of new mounts. You could just turn the snaps off and mount it seperately and test this yourself; I think it will work. It also avoids the problem of copying the old file over it's newer copy with the same inode (in UNIX). Bruce

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Nifty symlink trick
by Stephen C. Losen 05 Nov '98

05 Nov '98

This may be old news, but I discovered it while playing around with a F630 running 5.0.2. The netapp filer itself follows symlinks. I guess that shouldn't be a surprise, but, technically, I don't think that a filer has to follow symlinks. In NFS, the CLIENT follows the symlink, not the server. The server simply passes to the client the contents of the symlink. So one could design a filer that does not itself follow symlinks and it would still be a correct NFS server. (CIFS is another story.) Our F630 has two volumes: /vol/vol0 (the root volume) and /vol/vol1, which NFS clients mount on /h2. Just for fun, I created this symlink in /vol/vol0 /vol/vol0/h2 -> /vol/vol1 So now on the netapp, /h2 -> /vol/vol1 I discovered I can now use /h2 in config files wherever I would ordinarily use /vol/vol1. In /etc/exports I have successfully exported /vol/vol1 like this: /h2 access=foo.bar.EDU And this command works on NFS clients for mounting: mount home2.Virginia.EDU:/h2 /h2 And it also works in the quotas file. /h2/users/loginid user@/h2 100M 100K Note that this trick only works where /vol/vol1 would be appropriate. For example I still have to use "quota on vol1", but I can change the volume name from vol1 to h2, to fix that up. (and then change my symlink to /vol/vol0/h2 -> /vol/h2) An advantage to using this trick occurs to me. If you change a volume name, you may be forced to change quite a few config files. If you use a symlink in the config files, you can rename a volume and then just change the link. Also, pathnames on clients, such as /h2/foo/bar will also work on the server. So then you don't have to always translate paths in your head from "client-style" to "server-style" when running a command on the server, such as "quota report /h2/foo/bar" Disclaimer: I don't know if Network Appliance will guarantee this behavior in future releases. Steve Losen scl(a)virginia.edu phone: 804-924-0640 University of Virginia ITC Unix Support

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RE: Changed DLT 4000 for DLT 7000 - how to get new storage densit y?
by Thomson, Michael (UK, GIS ISM Group for R&D) 05 Nov '98

05 Nov '98

Apologies to you all, but this was not a problem at all. I must have examined a tape that hadn't been written to. Last nights backups behaved as expected, writing at the full density capability of the drive. <sheepish grin> Mike -- \\|||// Minds are like parachutes; (@ @) They only work when open. *---oOO-(_)-OOo------------------------------------* * Michael Thomson Email: mt53590(a)ggr.co.uk * * Unix Specialist Internal: 782 2369 * * Glaxo Wellcome External: 01438 762 369 * * Stevenage, UK Fax: 01438 762 461 * * .oooO Oooo. Mobile: 0498 725 047 * *--( )---( )-----------------------------------* \ ( ) / (Quote: Sir James Dewar) \_) (_/ > ---------- > From: Thomson, Michael (UK, GIS ISM Group for R&D) > Sent: 05 November 1998 11:49 > To: 'support(a)netapp.com' > Cc: 'toasters(a)mathworks.com' > Subject: Changed DLT 4000 for DLT 7000 - how to get new storage > density? > > Hi there. > > Last weekend we upgraded our DLT4700 (single DLT4000, 7 slots) for a > Brece-Hill Q2.15 (two DLT 7000, 15 slots). > We're reusing the CompacTape IV cartridges, but the new drives seem to > recognise the old tapes as being written by a DLT4000, and don't use the > higher density that the DLT7000 is capable of. > > Is there an easy way to re-initialise the tapes that'll allow us to use > the maximum storage capacity? > > Details follow: > > First we check the status of the drive: > > Checking pre-dump status with: rsh -n <filer> mt -f nrst0a status > Tape drive: Digital DLT7000 > Status: ready, write enabled > Format: 85937 bpi 70 GB (w/comp) > fileno = 0 blockno = 0 resid = 0 > > This implies that it'll use the high density we're after... > > Then we do the dump > > rsh -n <filer> dump 0ufbB urst0a,urst0a,urst0a,nrst0a 63 30000000 / > > (Yes, I know the block count is low - we're trying to fix the problems > without causing any EOT fun & games) > > Now after the dump is done, we load the tape into the drive, which reports > > A: Idle C 20.00G > > This says to me that the tape is still recorded at the DLT4000 density, > albeit with compression. > > Any suggestions? > > Cheers, > Mike > -- > \\|||// Minds are like parachutes; > (@ @) They only work when open. > *---oOO-(_)-OOo------------------------------------* > * Michael Thomson Email: mt53590(a)ggr.co.uk * > * Unix Specialist Internal: 782 2369 * > * Glaxo Wellcome External: 01438 762 369 * > * Stevenage, UK Fax: 01438 762 461 * > * .oooO Oooo. Mobile: 0498 725 047 * > *--( )---( )-----------------------------------* > \ ( ) / (Quote: Sir James Dewar) > \_) (_/ > >

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Changed DLT 4000 for DLT 7000 - how to get new storage density?
by Thomson, Michael (UK, GIS ISM Group for R&D) 05 Nov '98

05 Nov '98

Hi there. Last weekend we upgraded our DLT4700 (single DLT4000, 7 slots) for a Brece-Hill Q2.15 (two DLT 7000, 15 slots). We're reusing the CompacTape IV cartridges, but the new drives seem to recognise the old tapes as being written by a DLT4000, and don't use the higher density that the DLT7000 is capable of. Is there an easy way to re-initialise the tapes that'll allow us to use the maximum storage capacity? Details follow: First we check the status of the drive: Checking pre-dump status with: rsh -n <filer> mt -f nrst0a status Tape drive: Digital DLT7000 Status: ready, write enabled Format: 85937 bpi 70 GB (w/comp) fileno = 0 blockno = 0 resid = 0 This implies that it'll use the high density we're after... Then we do the dump rsh -n <filer> dump 0ufbB urst0a,urst0a,urst0a,nrst0a 63 30000000 / (Yes, I know the block count is low - we're trying to fix the problems without causing any EOT fun & games) Now after the dump is done, we load the tape into the drive, which reports A: Idle C 20.00G This says to me that the tape is still recorded at the DLT4000 density, albeit with compression. Any suggestions? Cheers, Mike -- \\|||// Minds are like parachutes; (@ @) They only work when open. *---oOO-(_)-OOo------------------------------------* * Michael Thomson Email: mt53590(a)ggr.co.uk * * Unix Specialist Internal: 782 2369 * * Glaxo Wellcome External: 01438 762 369 * * Stevenage, UK Fax: 01438 762 461 * * .oooO Oooo. Mobile: 0498 725 047 * *--( )---( )-----------------------------------* \ ( ) / (Quote: Sir James Dewar) \_) (_/

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Dual home fiber
by Algar, Christopher [PAI01:8881:EXCH] 05 Nov '98

05 Nov '98

Greetings. I'm having a bit of difficulty configuring a F760 with two fiber cards on different sub nets. It's been running fine with ifconfig f3 `hostname`-f3 netmask 255.255.240.0 I've tried adding a similar line to etc/rc for f1 explicitly stating the IP address instead of hostname, installing the additional card in slot 1 and rebooting. Also tried installing the card with no changes to rc and rebooting. The result is the same, the system panics and fails to boot. Can anyone help? Regards, Chris Algar UNIX support (amongst other things) Nortel Optoelectronics Paignton UK

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raid scrubbing and hot spares
by Dave Cole 05 Nov '98

05 Nov '98

We have a number of f230's here that seem to have either stopped doing their raid scrubbing or isn't bothering to report it any more. while the /etc/rc file doesn't explicitly ask to turn on scrubbing, doing an 'rsh netapp1 options' returns this: raidtimeout 24 raid.reconstruct_speed 4 raid.scrub.enable on which seems pretty typical. Only 2 out of our 7 operating netapps are actually logging this: Sun Oct 18 01:00:00 EDT [raid_scrub_admin]: Beginning disk scrubbing... Sun Oct 18 02:47:16 EDT [raid_scrub_admin]: Scrub found 0 parity inconsistencies Sun Oct 18 02:47:16 EDT [raid_scrub_admin]: Scrub found 0 media errors Sun Oct 18 02:47:16 EDT [raid_scrub_admin]: Disk scrubbing finished... Of the two that are logging, one is an f210 running ONTAP 4.2a, the other is an f210 running ONTAP 5.1.2 The ones not logging are 4 x f230's, 1 x f220. On a related note, we happen to know that one of our hot spares on one of the f210's is showing a read error. It was discovered during the install. I'm not entirely sure if I have logs of the discovery. But along that line, are there any tests or scrubs done or are they assumed to be healthy? ---------------------------------------------------------------- Dave Cole (DC1110) | dacole(a)netcom.ca Systems Administrator |* dacole(a)rik.net * | office/~dacole/ Netcom Canada |* www.rik.net/~dacole/ * 905 King Street West, Toronto, M6K 3G9 | phone - 416.341.5801 Toronto, Ontario, Canada, Earth, Sol | fax - 416.341.5725

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RE: can't see ~snapshot directory
by Allison, Bridget 05 Nov '98

05 Nov '98

Firstly, yes, there's a fix - see the man page extract: cifs.show_snapshot By default this option is FALSE. The snapshot directory ~snapshot is no longer shown at the root of a share. This is a change in behavior from previous versions. Setting this to TRUE will restore the old behavior. On Windows NT 4 or Windows 95 clients, the user can access snapshots by entering \\filer\share\.snapshot (or ~snapshot or ~snapsht) in the Start->Run menu. Snapshots can also be accessed lower in the share by providing a path to a lower directory. Snapshots can be accessed through DOS on any system by changing to the ~snapsht directory. We changed the default due to problems with NT backup software handling snapshots badly. > We use NFS and CIFS on our toasters. Since upgrading to 5.1.2, our > PC clients no longer see the ~snapshot directories. (This is the > .snapshot directory on unix clients.) > > Is there a fix? This is disconcerting. Or should I say broken?

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can't see ~snapshot directory
by Tom Reingold 04 Nov '98

04 Nov '98

We use NFS and CIFS on our toasters. Since upgrading to 5.1.2, our PC clients no longer see the ~snapshot directories. (This is the .snapshot directory on unix clients.) Is there a fix? This is disconcerting. Or should I say broken?

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Re: Quota initialization speed on F230
by mds＠ns.gbnet.net 03 Nov '98

03 Nov '98

Sounds bad - does this pertain to 5.1.2 or 5.1.2D1?

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Quota initialization speed on F230
by Brian Tao 03 Nov '98

03 Nov '98

Is it just me, or is quota initialization on an F230 running 5.1.2 excruciatingly slow? I don't remember our other F230's being this slow at redoing tree quotas with 4.2a, especially when the filer is basically empty (only the /etc directory is populated). It's been 15 minutes since a "quota on", and the filer only reports 39% done. I'm sure it was faster in 4.2a. # rsh toast quota vol0: quotas are initializing (39% done). # rsh toast df Filesystem kbytes used avail capacity Mounted on /vol/vol0/ 33007568 1212560 31795008 4% /vol/vol0/ /vol/vol0/.snapshot 11002520 0 11002520 0% /vol/vol0/.snapshot # rsh toast df -i Filesystem iused ifree %iused Mounted on /vol/vol0/ 1161 8709169 0% /vol/vol0/ # rsh toast sysstat 1 CPU NFS CIFS HTTP Net kB/s Disk kB/s Tape kB/s Cache in out read write read write age 37% 0 0 0 0 0 1211 0 0 0 6 72% 0 0 0 1 0 76 0 0 0 6 22% 0 0 0 0 0 244 0 0 0 6 30% 0 0 0 1 0 1234 0 0 0 6 79% 0 0 0 2 0 56 0 0 0 6 ^C -- Brian Tao (BT300, taob(a)risc.org) "Though this be madness, yet there is method in't"

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Changing which volume is the root volume W/O losing data?
by Larry Rosenman-CyberRamp System Administration 02 Nov '98

02 Nov '98

Is it possible on 5.1D14 to change which of 2 volumes is the root volume of a F520-110? I have a filer that has 14 disks (100GB), and 2 volumes: 30gb Mail 70gb News. Mail is the current root volume. I want to make the news volume the root volume, but not lose the data on news. I then want to destroy mail (it's moving to a new filer), and add it's disks to the news volume. How would I go about this? Thanks! LER -- Larry Rosenman, Sr. System Administrator, CyberRamp Internet Services E-Mail: ler(a)cyberramp.net, http://www.cyberramp.net Voice: (214) 343-3333/(817) 461-8484 (Metro)/Fax: (214) 343-3727 Tech Support: (214) 340-2020/(817) 226-2020 (Metro) 7AM-Midnight, 7 Days U.S. Mail: 11350 Hillguard Rd, Dallas, TX 75243-8311

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Re: SMTP MIB (was Re: raid scrubbing and hot spares)
by mds＠ns.gbnet.net 29 Oct '98

29 Oct '98

Has anyone thought of adding a counter for the number of NVRAM flushes for a given rolling period? My understanding is that one of the issues in achieving excellent performance on writes is avoiding, or dealing with, back-to-back consistency points. It strikes me that a simple metric based on the number of NVRAM flushes-to-disk over the last 60-seconds, updated every 5 seconds say, would give people a handle on whether there's a bottleneck happening there. It might be even more interesting to keep track of in the clustered-filer environment.

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