toasters

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13520 discussions

Re: kicking an unhappy ssh daemon
by Bennett Todd 29 Jun '11

29 Jun '11

That suggests an idea for the possible cause, to me. Symptom: inbound ssh connections start hanging, and eventually, after a long time, recover. Each new ssh connection requires some high-quality random bits, unguessable absent knowledge that can't be externally observed. Suppose the ssh server is drawing them directly from an entropy pool that is only slowly, gradually refilled by the OS observing things like the rotational latency of spinning drives as that's slightly disturbed by turbulence? I don't know the OS that underlies netapps, so I don't know if that pool can be manually fed from commandline, nor if the ssh server can be redirected to a PRNG itself just seeded by the entropy pool. Or if so how to do it. -Bennett On Jun 29, 2011 1:31 AM, "Stefan Funke" <bundy(a)usage.de> wrote:

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Re: kicking an unhappy ssh daemon
by David N. Blank-Edelman 29 Jun '11

29 Jun '11

Hi Felix- Thanks for your response. On Tuesday, June 28, 2011 at 6:08 PM, Felix Schröder wrote: > To kick out a stalled SSH session just type "ssh root@filer logout telnet" on a *nix machine, then type in the password - That will force the filer to logout any interactive (ssh) session. It works the same way with rsh. I must not have been clear in my message. Both interactive, and non-interactive ssh command the machine are hanging. I can't even do an ssh netapp help, nevermind execute the logout command. The connections never get that far. I should also mention that at the moment, according to netstat, there are no existing ssh connections so there isn't really anything to logout. -- dNb

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Re: kicking an unhappy ssh daemon
by David N. Blank-Edelman 29 Jun '11

29 Jun '11

On Tuesday, June 28, 2011 at 7:48 PM, Felix Schröder wrote: > When a session has become hung, if a serial console session is possible, or > some other means of issuing commands is possible, then the hung connection > may be located in the output of the "netstat -a" command so that the "Swind" > size may be checked: if it is zero, then this problem may be occurring, and > the user may try to close and then re-open the session from the client. Hmm, so my read of this bug is "sometimes sessions in progress hang. If that happens, start another session" which doesn't seem quite like what I am seeing where I can't even start a session at this point. -- dNb

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Issues with Compression?
by Milazzo Giacomo 25 Jun '11

25 Jun '11

Hi all, I've received a couple of alert from field with users using DoT 8.0.1 compression feature on Oracle production environment. Their application hang! NetApp representative here in Italy suggested us to avoid, for the moment, to use compression on Oracle and generally on DB/backup environment... Do you have experience? Positive and not I mean. And, of course, not only on Oracle/DB environment. Thank you in advance,

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one cifs share from two vols ?
by Chaim Rieger 22 Jun '11

22 Jun '11

say i have vol/vol1 and vol/vol2 i want to create a cifs share \\cifs\share1 that shares out /vol/vol1 as \\cifs\share1 and /vol/vol2 as \\cifs\share1\share2 is this possible or would i have to create a second share \\cifs\share1\share2 for the second volume ?

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volume, qtree snapmirror resync question
by Steve Losen 20 Jun '11

20 Jun '11

Hi Toasters, We have recently upgraded to ONTAP 8.0.1 and are migrating to 64 bit aggrs/vols. Quick question: Say I have 32 bit volume A on primary storage being volume snapmirrored to 32 bit volume B on secondary storage. A has one qtree, then entire volume itself. I create 64 bit volume C on secondary storage and use qtree snapmirror to copy /vol/B/- to /vol/C/qtree Is there any way to resync C and A now? Will this work on secondary? snapmirror resync -S primary:/vol/A/- /vol/C/qtree I suppose I must snapmirror break the B, C relationship first. If this will work then we can migrate a lot of our secondary storage to 64 bit without heavily impacting primary storage. Steve Losen scl(a)virginia.edu phone: 434-924-0640 University of Virginia ITC Unix Support

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Truncated SSH ouptut on 8.x?
by A Darren Dunham 07 Jun '11

07 Jun '11

Anyone seen differences with SSH command output on 8.x filers? I've encountered this a few times lately, and as best I can tell it's always been on 8.x machines. It appears to be more likely to happen on the first command to a filer in a while. I'll run something like "ssh <filer> exportfs" and either get a line or two or just a normal prompt returned with no output. Never an error. Then I'll just repeat the last command and get full output. In fact I can repeat it multiple times and never see the error again. There is a KB article that seems similar (https://kb.netapp.com/support/index?page=content&id=2013198), but it's not really the same, affects 7.x, and the variable that is mentioned to resolve doesn't seem appropriate. I don't have a lot of hard data on this, I'm not prepared to open a ticket on just yet. But I'm wondering if others have seen it. Thanks, -- Darren

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RE: Hot remove disk shelves?
by Steiner, Jeffrey 02 Jun '11

02 Jun '11

I've heard that asked before, and the answer was no. The issue was something about internal device maps. The filers build maps of which devices are where on the loops, and that includes the shelf itself as well as the drives. Both controllers are aware of the shelves at all times, even if they aren't actually using disks inside them. The only safe way to remove the shelf is at a time when neither controller is aware of it, and that means when both are off. >-----Original Message----- >From: Borzenkov, Andrey [mailto:andrey.borzenkov@ts.fujitsu.com] >Sent: Thursday, June 02, 2011 4:06 PM >To: Steiner, Jeffrey; Blake Golliher; Steve Losen >Cc: toasters(a)mathworks.com >Subject: RE: Hot remove disk shelves? > >Would it be possible via takeover/giveback? I.e. - takeover node2, >unplug shelf on node2 side then do the same with node1? Would it still >lead to problem mentioned? > > >--- >With best regards > >Andrey Borzenkov >Senior system engineer >Service operations > >-----Original Message----- >From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] >On Behalf Of Steiner, Jeffrey >Sent: Thursday, June 02, 2011 6:45 PM >To: Blake Golliher; Steve Losen >Cc: toasters(a)mathworks.com >Subject: RE: Hot remove disk shelves? > >It may appear to work at first, but you'll have a panic and crash >eventually. It might last a week or two, but you'll eventually have >problems. > >If you move quick and you have your FC/NFS timeouts set right, you can >shut down, decable the shelves, and turn it back on before hosts will >notice. I've done that myself more than a few times. > > >>-----Original Message----- >>From: Blake Golliher [mailto:thelastman@gmail.com] >>Sent: Thursday, June 02, 2011 3:07 PM >>To: Steve Losen >>Cc: toasters(a)mathworks.com >>Subject: Re: Hot remove disk shelves? >> >>I've seen people do this without problems, but I've not had to do it >>yet myself. Having the disks unassigned is a good idea since you'll >>want them unowned when you add them to other heads. If you can afford >>to do it while in takeover mode that probably couldn't hurt. >> >>Let us know how it goes. I'm under the impression this works, but is >>unsupported from netapp eng still. >> >>-Blake >> >>On Thu, Jun 2, 2011 at 6:03 AM, Steve Losen ><scl(a)sasha.acc.virginia.edu> >>wrote: >>> >>> Hello Toasters, >>> >>> We have a FAS3170 HA pair with some SATA disk shelves (AT-FCX) >>> attached to the end of a chain where none of the disks are in use >>> (all are spares, all have ownership assigned). We are running >>> ONTAP 8.0.1. >>> >>> The chain is singly attached to both controllers, i.e., the >>> shelf "A" modules are chained to a single FC adapter on one >>> controller and the shelf "B" modules are chained to a single >>> FC adapter on the other controller. >>> >>> The shelves we want to remove are at the far end of the chain. >>> Essentially we want to undo the result of a hot shelf add without >>> downtime. >>> >>> Is it possible to hot remove these shelves? Would it help to >>> "un-own" the disks first? >>> >>> I suppose this could be done using CF takeover/giveback >>> but that might be too disruptive. >>> >>> Steve Losen scl(a)virginia.edu phone: 434-924-0640 >>> >>> University of Virginia ITC Unix Support >>> >>> >>> >

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Hot remove disk shelves?
by Steve Losen 02 Jun '11

02 Jun '11

Hello Toasters, We have a FAS3170 HA pair with some SATA disk shelves (AT-FCX) attached to the end of a chain where none of the disks are in use (all are spares, all have ownership assigned). We are running ONTAP 8.0.1. The chain is singly attached to both controllers, i.e., the shelf "A" modules are chained to a single FC adapter on one controller and the shelf "B" modules are chained to a single FC adapter on the other controller. The shelves we want to remove are at the far end of the chain. Essentially we want to undo the result of a hot shelf add without downtime. Is it possible to hot remove these shelves? Would it help to "un-own" the disks first? I suppose this could be done using CF takeover/giveback but that might be too disruptive. Steve Losen scl(a)virginia.edu phone: 434-924-0640 University of Virginia ITC Unix Support

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Moving disks to another controller (head)
by Steve Losen 18 May '11

18 May '11

Hi Toasters, I need to physically move some disks/aggregates to another controller. Do you see anything wrong with this procedure? 1) upgrade DOT to the same version on both heads (7.3.3) 2) shut down and power off both heads 3) physically move the disk shelves 4) boot the destination head in maintenance mode and use "disk assign" to take ownership of the moved disks 5) boot the destination head normally 6) aggr online the foreign aggregates I am concerned about step 4 above. Will it work or do I need to boot the source filer in maintenance mode and change the disk ownership to the destination head before moving the disks? In step 5 some of the foreign aggregates will have names that conflict with native aggregates. I presume that when ONTAP boots it will automatically rename the foreign aggrs as necessary. Or must I rename them on the source filer beforehand? I know that some of you do this routinely, so I appreciate any words of advice. Steve Losen scl(a)virginia.edu phone: 434-924-0640 University of Virginia ITC Unix Support

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