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UDP vs. TCP
by Charles Bartels 24 Jan '03

24 Jan '03

> We've switched to running NFS v3 over UDP on the F740 (which is the > only GigE we have in production on our NetApps). We haven't had > any performance issues since. This filer is housing DB/2. What are the pros/cons of running UDP as opposed to TCP ? UDP doesn't have the same error correction, ja? Isn't that inherently unstable or dangerous? -Charles Bartels

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Filer setting tcp.wsize to 0 -> NFS timeouts
by Pawel Rogocz 24 Jan '03

24 Jan '03

I have been having NFS performance problems with our F820 / 6.2.1R2 for quite some time now. The filer has a GigE card, but when we start pushing about 10MB/sec ( 50 % CPU load ) we get numerous NFS timeouts from solaris clients mounting the filer via tcp. None of the filer stats (statit et all) show any bottleneck on any of the disks. Looking at network traces from a mirrored port, I see the filer at some point reducing tcp window size to 0, down from its normal value - 26280. Looks like it is running out of juice. Any ideas what might be causing this ? Pawel -

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RE: disappearing CIFS permissions ...
by Waters, G Scott DSTI 24 Jan '03

24 Jan '03

We were running 6.2R2 since it was released and we were seeing the problem occasionally. We recently (in the last week) upgraded to 6.2.2 - it hasn't been in place long enough to say if things have changed. - Scott W. -----Original Message----- From: Nail, Larry [mailto:lnail@ti.com] Sent: Friday, January 24, 2003 11:01 AM To: 'toasters(a)mathworks.com' Subject: RE: disappearing CIFS permissions ... Scott, We had the same set of problems when we were running 5.3.7 on the filers... when we upgraded to 6.x, we stopped seeing those problems. The only problem we did resolve was we had a share name "L&I". When we renamed the share to LnI, it stopped dropping it's permissions. Larry -----Original Message----- From: Waters, G Scott DSTI [mailto:george.scott.waters@us.army.mil] Sent: Friday, January 24, 2003 9:32 AM To: 'toasters(a)mathworks.com' Subject: disappearing CIFS permissions ... Has anyone had any problems with setting CIFS share permissions and then having them disappear?? We have a series of scripts that run at night that manage our users in our NT4 domain. Our users are created and then for each user a home share is created on our filer. Every once in a while we will get a complaint that one of our new users can not access their home share. I check the share and sure enough the permissions are not there. However, when I check the output from our scripts they show that the permissions were set successfully. The user is created in the script by using the NET USER command and the shares are manipulated by the RMTSHARE program from the NT Resource Kit. After the user is created Domain Admins are granted permissions to the SHARE (and those permissions are always there) then the user is granted permissions (and that is where the problem occasionally occurs). It's an annoyance that I can't explain ... and I don't like those. If anyone has any ideas / suggestions / etc, etc ... please let me know. Thanks. - Scott W.

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RE: disappearing CIFS permissions ...
by Waters, G Scott DSTI 24 Jan '03

24 Jan '03

Stacie ... The QTree is NTFS. The script runs on the domain controller and sets share permissions on the filer ... and the problem is *very* intermittent. - Scott W. -----Original Message----- From: sjmontoya [mailto:sjmontoya@micron.com] Sent: Friday, January 24, 2003 11:02 AM To: 'Waters, G Scott DSTI'; 'toasters(a)mathworks.com' Subject: RE: disappearing CIFS permissions ... Scott, What type is assigned to the qtree that is being shared out as CIFS? Where is your script granting the user permissions? On the NetApp itself? Or from NT? I have recently been setting up CIFS shares from qtrees that are "mixed". What I have noticed is that permissions changes made on the UNIX side show up in the NT ACLs and vice versa. I've also noticed that "Special permissions" are given in the case where the user might not be in the NT group that has been given permissions, but is in the UNIX group that owns the file/directory. Stacie Montoya

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RE: disappearing CIFS permissions ...
by Nail, Larry 24 Jan '03

24 Jan '03

Note this was a CIFS only filer in this case. -----Original Message----- From: Nail, Larry Sent: Friday, January 24, 2003 10:01 AM To: 'toasters(a)mathworks.com' Subject: RE: disappearing CIFS permissions ... Scott, We had the same set of problems when we were running 5.3.7 on the filers... when we upgraded to 6.x, we stopped seeing those problems. The only problem we did resolve was we had a share name "L&I". When we renamed the share to LnI, it stopped dropping it's permissions. Larry -----Original Message----- From: Waters, G Scott DSTI [mailto:george.scott.waters@us.army.mil] Sent: Friday, January 24, 2003 9:32 AM To: 'toasters(a)mathworks.com' Subject: disappearing CIFS permissions ... Has anyone had any problems with setting CIFS share permissions and then having them disappear?? We have a series of scripts that run at night that manage our users in our NT4 domain. Our users are created and then for each user a home share is created on our filer. Every once in a while we will get a complaint that one of our new users can not access their home share. I check the share and sure enough the permissions are not there. However, when I check the output from our scripts they show that the permissions were set successfully. The user is created in the script by using the NET USER command and the shares are manipulated by the RMTSHARE program from the NT Resource Kit. After the user is created Domain Admins are granted permissions to the SHARE (and those permissions are always there) then the user is granted permissions (and that is where the problem occasionally occurs). It's an annoyance that I can't explain ... and I don't like those. If anyone has any ideas / suggestions / etc, etc ... please let me know. Thanks. - Scott W.

1 0

RE: disappearing CIFS permissions ...
by sjmontoya 24 Jan '03

24 Jan '03

Scott, What type is assigned to the qtree that is being shared out as CIFS? Where is your script granting the user permissions? On the NetApp itself? Or from NT? I have recently been setting up CIFS shares from qtrees that are "mixed". What I have noticed is that permissions changes made on the UNIX side show up in the NT ACLs and vice versa. I've also noticed that "Special permissions" are given in the case where the user might not be in the NT group that has been given permissions, but is in the UNIX group that owns the file/directory. Stacie Montoya -----Original Message----- From: Waters, G Scott DSTI [mailto:george.scott.waters@us.army.mil] Sent: Friday, January 24, 2003 8:32 AM To: 'toasters(a)mathworks.com' Subject: disappearing CIFS permissions ... Has anyone had any problems with setting CIFS share permissions and then having them disappear?? We have a series of scripts that run at night that manage our users in our NT4 domain. Our users are created and then for each user a home share is created on our filer. Every once in a while we will get a complaint that one of our new users can not access their home share. I check the share and sure enough the permissions are not there. However, when I check the output from our scripts they show that the permissions were set successfully. The user is created in the script by using the NET USER command and the shares are manipulated by the RMTSHARE program from the NT Resource Kit. After the user is created Domain Admins are granted permissions to the SHARE (and those permissions are always there) then the user is granted permissions (and that is where the problem occasionally occurs). It's an annoyance that I can't explain ... and I don't like those. If anyone has any ideas / suggestions / etc, etc ... please let me know. Thanks. - Scott W.

1 0

RE: disappearing CIFS permissions ...
by Nail, Larry 24 Jan '03

24 Jan '03

Scott, We had the same set of problems when we were running 5.3.7 on the filers... when we upgraded to 6.x, we stopped seeing those problems. The only problem we did resolve was we had a share name "L&I". When we renamed the share to LnI, it stopped dropping it's permissions. Larry -----Original Message----- From: Waters, G Scott DSTI [mailto:george.scott.waters@us.army.mil] Sent: Friday, January 24, 2003 9:32 AM To: 'toasters(a)mathworks.com' Subject: disappearing CIFS permissions ... Has anyone had any problems with setting CIFS share permissions and then having them disappear?? We have a series of scripts that run at night that manage our users in our NT4 domain. Our users are created and then for each user a home share is created on our filer. Every once in a while we will get a complaint that one of our new users can not access their home share. I check the share and sure enough the permissions are not there. However, when I check the output from our scripts they show that the permissions were set successfully. The user is created in the script by using the NET USER command and the shares are manipulated by the RMTSHARE program from the NT Resource Kit. After the user is created Domain Admins are granted permissions to the SHARE (and those permissions are always there) then the user is granted permissions (and that is where the problem occasionally occurs). It's an annoyance that I can't explain ... and I don't like those. If anyone has any ideas / suggestions / etc, etc ... please let me know. Thanks. - Scott W.

1 0

disappearing CIFS permissions ...
by Waters, G Scott DSTI 24 Jan '03

24 Jan '03

Has anyone had any problems with setting CIFS share permissions and then having them disappear?? We have a series of scripts that run at night that manage our users in our NT4 domain. Our users are created and then for each user a home share is created on our filer. Every once in a while we will get a complaint that one of our new users can not access their home share. I check the share and sure enough the permissions are not there. However, when I check the output from our scripts they show that the permissions were set successfully. The user is created in the script by using the NET USER command and the shares are manipulated by the RMTSHARE program from the NT Resource Kit. After the user is created Domain Admins are granted permissions to the SHARE (and those permissions are always there) then the user is granted permissions (and that is where the problem occasionally occurs). It's an annoyance that I can't explain ... and I don't like those. If anyone has any ideas / suggestions / etc, etc ... please let me know. Thanks. - Scott W.

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RE: Spare disks and SnapRestore
by Alan McLachlan 24 Jan '03

24 Jan '03

Actually, spares don't count as far as the software limits are concerned. Data Ontap will prevent you adding disks to a live volume if you are hitting the volume or total filer storage limits, but the number of hot spares is only limited by the available id's on the FCAL loop. Tested on Data OnTap 6.2.2 and Data Ontap 6.3 regards, Alan McLachlan Senior Systems Engineer Storage Management Solutions ASI Solutions www.asi.com.au Ph +61 2 6230 1566 Fax +61 2 6230 5343 Mobile +61 428 655644 e-mail amclachlan(a)asi.com.au . -----Original Message----- From: Jacek Nogala [mailto:jacek.nogala@solidex.com.pl] Sent: Thursday, 23 January 2003 9:16 PM To: toasters(a)mathworks.com Cc: Charles Bartels Subject: ODP: Spare disks and SnapRestore > The first is regarding spare disks. I'm going to have a fully loaded F810 soon; > 2 shelves with a total of twenty-one 72GB drives. Since I will have spare slots > in the shelves I was wondering if I can setup the netapp with a 22nd drive as a > hot-spare instead of "wasting" one out of my 21 disk pool. The specs on the F810 > say it maxes out at 1.5 TB raw which I will be hitting with the 21 drives. AFAIK 1.5 TB storage limit includes all installed disks. It means that 22 disk configuration for F810 is definitely not supported by NetApp and it is probably not working (some limits are enforced with Data ONTAP - I am not sure if this as well). > And a much more general question; what does SnapRestore do? > I believe this is a separately licensed option and I haven't > really been able to glean too much from the Netapp website. SnapRestore enables you instant reversion to the selected snapshot state of the whole volume (all Data ONTAPs) or single file (Data ONTAP 6.2 or later). "Instant" means without copying data. Actually only necessary pointers are copied. You have to be aware of the following drawbacks: - It is one-way trip (you are loosing all SnapShot copies that were collected after the SnapShot that you selected for reversion). - SnapRestoring of single file has negative performance impact (this operation causes fragmentation of WAFL file system). I hope this helps. Best regards, Jacek Nogala --------------------------------------------------------------------------- Jacek Nogala __________ Inzynier Konsultant /______/__/ Al. Jerozolimskie 65/79 NetApp Certified Professional (Filer) _\____\___/ 00-697 Warszawa, Poland jacek.nogala(a)solidex.com.pl /______/__/ Tel: +48 (22) 630 66 11 http://www.solidex.com.pl SOLIDEX S.A. Fax: +48 (22) 630 66 13 --------------------------------------------------------------------------- **** ASI Solutions Disclaimer **** The material transmitted may contain confidential and/or privileged material and is intended only for the addressee. If you receive this in error, please notify the sender and destroy any copies of the material immediately. ASI will protect your Privacy according to the 10 Privacy Principles outlined under the new Privacy Act, Dec 2001. This email is also subject to copyright. Any use of or reliance upon this material by persons or entities other than the addressee is prohibited. E-mails may be interfered with, may contain computer viruses or other defects. Under no circumstances do we accept liability for any loss or damage which may result from your receipt of this message or any attachments. **** END OF MESSAGE ****

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Spare disks and SnapRestore
by Charles Bartels 23 Jan '03

23 Jan '03

Hi, I have a couple of questions. The first is regarding spare disks. I'm going to have a fully loaded F810 soon; 2 shelves with a total of twenty-one 72GB drives. Since I will have spare slots in the shelves I was wondering if I can setup the netapp with a 22nd drive as a hot-spare instead of "wasting" one out of my 21 disk pool. The specs on the F810 say it maxes out at 1.5 TB raw which I will be hitting with the 21 drives. And a much more general question; what does SnapRestore do? I believe this is a separately licensed option and I haven't really been able to glean too much from the Netapp website. Thanks. -Charles Bartels

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