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strange behaviour, Linux and NFS on NTFS qtree
by Dave Holland 11 Jun '08

11 Jun '08

Hello, I'm seeing some strange behaviour with a FAS3040 filer I have on evaluation at the moment. I have an NTFS-style qtree exported by NFS and CIFS. Debian Linux clients see odd behaviour relating to open() and stat64() system calls. This strace output from "vim" captures it in a nutshell: uname({sys="Linux", node="acheron", ...}) = 0 stat64("ffff", 0xbfb4d030) = -1 ENOENT (No such file or directory) stat64("ffff", 0xbfb4d0b0) = -1 ENOENT (No such file or directory) access("ffff", W_OK) = -1 ENOENT (No such file or directory) open("ffff", O_RDONLY) = -1 ENOENT (No such file or directory) readlink("ffff", 0xbfb4c7cc, 1023) = -1 ENOENT (No such file or directory) open(".ffff.swp", O_RDONLY) = -1 ENOENT (No such file or directory) open(".ffff.swp", O_RDWR|O_CREAT|O_EXCL, 0600) = -1 EACCES (Permission denied) stat64(".ffff.swp", {st_mode=S_IFREG|0777, st_size=0, ...}) = 0 Note that the open(O_RDWR...) call fails with EACCES; but the following stat64() call succeeds. The file ffff.swp was created on disk despite the reported failure of the open() call. This behaviour is seen using "vim" to edit files, and causes an error message about the swap file being present (due to the swap file being created even though the open() return value implies it was not). Trying the same "vim" command on a Tru64 NFS client, correct behaviour is seen: the open(O_RDWR...) succeeds and a filehandle is returned. I asked Netapp support and they suggested a mixed-style qtree. But I've read on this list about the last-change-wins problem on permissions and ACLs, and I'd really rather not go there. I've worked through the troubleshooting guide: http://now.netapp.com/NOW/knowledge/docs/olio/guides/ontap_troubleshooting with no luck. Is there anything else I can configure (on the filer or on the clients) to avoid this problem? Thanks for any suggestions! Dave -- ** Dave Holland ** Systems Support -- Infrastructure Management ** ** 01223 496923 ** The Sanger Institute, Hinxton, Cambridge, UK ** -- The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a company registered in England with number 2742969, whose registered office is 215 Euston Road, London, NW1 2BE.

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RE: At which point does high disk utilization impact IO requests?
by Christopher Mende 10 Jun '08

10 Jun '08

Normally if a client is starting to see latency in an app, I use perfstat for a snapshot measurement and consider changes if disk utilization starts creeping up towards 80%. DFM/OM or SNMP-based monitoring tools have been useful in alerting on sustained high disk utilization or volume latency. Christopher Mende Sr Solutions Architect Peak UpTime +1 913 523 4263 ________________________________ From: Hadrian Baron <Hadrian.Baron(a)vegas.com> Sent: Tuesday, June 10, 2008 13:39 To: toasters(a)mathworks.com <toasters(a)mathworks.com> Subject: At which point does high disk utilization impact IO requests? When average disk utilization across all disks in an aggregate becomes high, IO requests are delayed. My question is what should this threshold be? I’ve heard from one performance consultant that 40% disk utilization is where you start seeing latency (this was in regards to a HDS array). The Netapp Storage Performance Management using DFM TR-3525 says 70% is the industry accepted disk utilization threshold. http://www-download.netapp.com/edm/TOT/docs/3525.pdf (page 17) Here is some interesting EMC FUD comparing a 3050 and a CX3-40 which says the Netapp beats the CX3 until disk utilization passes 20% then latency increases dramatically (page 7). http://www.dell.com/downloads/global/products/pvaul/en/netapp_performance_s… (page 7) Every environment is different, so the proper answer is of course – It depends – and you should test for yourself. It depends on whether you can accept 5ms more latency, or 50ms more. It depends on what kind of IO you do. But my question is what *your* threshold is, and how can you automate the monitoring of disk utilization? TIA, Hadrian

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Map CIFS homedir based on share name instead of username?
by Adam McDougall 10 Jun '08

10 Jun '08

Without manually creating a share for each user, is it possible for the filer to use the supplied share name as the connecting user, instead of the username from the credentials? I am trying to mimic the samba behavior where I can connect to \\samba\someuser with ANY credentials, and if those credentials do not work, it prompts me for user/pass. I added our home directory paths in cifs_homedir.cfg and tried different settings for cifs.home_dir_namestyle but they all seem to use the username from the credentials that are connecting, not the requested share name. For example, if I am logged into windows as mcdouga9, I can connect to \\filer\mcdouga9 just fine, but if I connect to \\filer\anothervaliduser, it claims "\\filer\anothervaliduser No network provider accepted the given network path.". I'd rather be prompted for credentials so I can enter the username/password. It does work if I supply the username/pass while connecting. Thanks.

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At which point does high disk utilization impact IO requests?
by Hadrian Baron 10 Jun '08

10 Jun '08

When average disk utilization across all disks in an aggregate becomes high, IO requests are delayed. My question is what should this threshold be? I've heard from one performance consultant that 40% disk utilization is where you start seeing latency (this was in regards to a HDS array). The Netapp Storage Performance Management using DFM TR-3525 says 70% is the industry accepted disk utilization threshold. http://www-download.netapp.com/edm/TOT/docs/3525.pdf (page 17) Here is some interesting EMC FUD comparing a 3050 and a CX3-40 which says the Netapp beats the CX3 until disk utilization passes 20% then latency increases dramatically (page 7). http://www.dell.com/downloads/global/products/pvaul/en/netapp_performance_s… (page 7) Every environment is different, so the proper answer is of course - It depends - and you should test for yourself. It depends on whether you can accept 5ms more latency, or 50ms more. It depends on what kind of IO you do. But my question is what *your* threshold is, and how can you automate the monitoring of disk utilization? TIA, Hadrian

1 0

Rename aggregate :: SnapLock and V-Series
by Kevin Parker 10 Jun '08

10 Jun '08

Hi Folks, Have any of you renamed a SnapLock (enterprise) aggregate? I don't see that renaming the aggr would have any effect or even need to change any data within. These are true aggregates (i.e.: not tradvols) with FlexVols. DOT 7.2.3 and above. Is there anything else to watch out for? What was your experience? Smooth as aggr rename on an otherwise standard aggr? Next question is about renaming a v-series aggregate. Experience? Cheers, Best regards, Kevin Parker

2 1

R: Where to get more tech specs?
by Milazzo Giacomo 06 Jun '08

06 Jun '08

I know! I got this from a guy here and I'm just reading now the data. I share with others that didn't know it http://www.storageperformance.org/results/benchmark_results_all There's some that can help. As others I expect some about FAS6xxx series. Regards Da: Uddhav Regmi [mailto:uddhav.regmi@worldnet.att.net] Inviato: venerdì 6 giugno 2008 15.34 A: Milazzo Giacomo; 'Glenn Walker'; toasters(a)mathworks.com Oggetto: RE: Where to get more tech specs? I wish this would come from somewhere inside Netapp R&D Performance Matrix Dept Hey, but don't worry. We are here to help out if you are not getting right numbers, you know...... just ping us -uddhav From: Milazzo Giacomo [mailto:G.Milazzo@sinergy.it] Sent: Friday, June 06, 2008 9:21 AM To: Uddhav Regmi; Glenn Walker; toasters(a)mathworks.com Subject: R: Where to get more tech specs? And last, since years and years there's always been "secrets" and "nda" on detailed tech specs of computers, appliances or, generally, IT relatad hardware!... Could this be the proof that IT is not science? J After all when I compare two cars I can have exact data from the two vendors... ;-) Da: Uddhav Regmi [mailto:uddhav.regmi@worldnet.att.net] Inviato: venerdì 6 giugno 2008 15.12 A: 'Glenn Walker'; Milazzo Giacomo; toasters(a)mathworks.com Oggetto: RE: Where to get more tech specs? Performance is not something which cannot be compared vis-a-vis with other platform/hardware..... In real life there could be so many variables ........ OnTAP tuning and hardwares can play the role Switching, paths , routing.....can play the role then finally your front end Server Platform, hardware and application can play the role...... All these are very tightly related..... -uddhav From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Glenn Walker Sent: Friday, June 06, 2008 8:46 AM To: Milazzo Giacomo; toasters(a)mathworks.com Subject: RE: Where to get more tech specs? You could look at specfs numbers (there's an organization that publishes this), and you can get the docs you've already seen from your sales team. It's not something that is typically given to customers. Check with your sales team (Channel perhaps?). Glenn ________________________________ From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Milazzo Giacomo Sent: Friday, June 06, 2008 3:02 AM To: toasters(a)mathworks.com Subject: Where to get more tech specs? Hi all Long times ago I was able to obtain from some NetApp guys documentation that regarded detailed tech specs of filer appliances with data on performances such us iops, throughput and so on with also comparison between models both from NetApp and competitor too. The data regarded NAS ans SAN (iSCSI and FCP) aspects. Do you know if there are available docs on new filers? Sometime it happens that customers ask us for comparison charts (i.e. now we could need data for IBM DS8000 storage and FAS3xxx and/or 6xxx filers regarding SAN FCP performances) regards

2 1

snapshot copy
by Mailing Lists 06 Jun '08

06 Jun '08

two filers, have a need to copy the data from source:vol:snap1 to dest:vol what would be the fastest way to do this, mounting and scp is pretty slow for me, is there some sort of mirroring that i can use to accomplish this ? -- eats the blues for breakfast, does unix for rent, plays harp for food, will play the flute for kicks rides for the freedom scrapes for the challenge

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R: Where to get more tech specs?
by Milazzo Giacomo 06 Jun '08

06 Jun '08

And last, since years and years there's always been "secrets" and "nda" on detailed tech specs of computers, appliances or, generally, IT relatad hardware!... Could this be the proof that IT is not science? J After all when I compare two cars I can have exact data from the two vendors... ;-) Da: Uddhav Regmi [mailto:uddhav.regmi@worldnet.att.net] Inviato: venerdì 6 giugno 2008 15.12 A: 'Glenn Walker'; Milazzo Giacomo; toasters(a)mathworks.com Oggetto: RE: Where to get more tech specs? Performance is not something which cannot be compared vis-a-vis with other platform/hardware..... In real life there could be so many variables ........ OnTAP tuning and hardwares can play the role Switching, paths , routing.....can play the role then finally your front end Server Platform, hardware and application can play the role...... All these are very tightly related..... -uddhav From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Glenn Walker Sent: Friday, June 06, 2008 8:46 AM To: Milazzo Giacomo; toasters(a)mathworks.com Subject: RE: Where to get more tech specs? You could look at specfs numbers (there's an organization that publishes this), and you can get the docs you've already seen from your sales team. It's not something that is typically given to customers. Check with your sales team (Channel perhaps?). Glenn ________________________________ From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Milazzo Giacomo Sent: Friday, June 06, 2008 3:02 AM To: toasters(a)mathworks.com Subject: Where to get more tech specs? Hi all Long times ago I was able to obtain from some NetApp guys documentation that regarded detailed tech specs of filer appliances with data on performances such us iops, throughput and so on with also comparison between models both from NetApp and competitor too. The data regarded NAS ans SAN (iSCSI and FCP) aspects. Do you know if there are available docs on new filers? Sometime it happens that customers ask us for comparison charts (i.e. now we could need data for IBM DS8000 storage and FAS3xxx and/or 6xxx filers regarding SAN FCP performances) regards

1 0

R: Where to get more tech specs?
by Milazzo Giacomo 06 Jun '08

06 Jun '08

I perfectly agree and I can add that "numbers alone often are without meaning" J But, if we can ideally think to something that can be compared analyzing numbers, graph and tables can let us have an idea of what we can expect... Just as sample, it's quite obvious that in terms of "fire power" there no story between a DS8xxx and a FAS6xxx (same size and type of disks, same F/C channels and speed, same hosts and apps and so on) but reading at the values we can do more that with no specs at all. My best regards, Da: Uddhav Regmi [mailto:uddhav.regmi@worldnet.att.net] Inviato: venerdì 6 giugno 2008 15.12 A: 'Glenn Walker'; Milazzo Giacomo; toasters(a)mathworks.com Oggetto: RE: Where to get more tech specs? Performance is not something which cannot be compared vis-a-vis with other platform/hardware..... In real life there could be so many variables ........ OnTAP tuning and hardwares can play the role Switching, paths , routing.....can play the role then finally your front end Server Platform, hardware and application can play the role...... All these are very tightly related..... -uddhav From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Glenn Walker Sent: Friday, June 06, 2008 8:46 AM To: Milazzo Giacomo; toasters(a)mathworks.com Subject: RE: Where to get more tech specs? You could look at specfs numbers (there's an organization that publishes this), and you can get the docs you've already seen from your sales team. It's not something that is typically given to customers. Check with your sales team (Channel perhaps?). Glenn ________________________________ From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Milazzo Giacomo Sent: Friday, June 06, 2008 3:02 AM To: toasters(a)mathworks.com Subject: Where to get more tech specs? Hi all Long times ago I was able to obtain from some NetApp guys documentation that regarded detailed tech specs of filer appliances with data on performances such us iops, throughput and so on with also comparison between models both from NetApp and competitor too. The data regarded NAS ans SAN (iSCSI and FCP) aspects. Do you know if there are available docs on new filers? Sometime it happens that customers ask us for comparison charts (i.e. now we could need data for IBM DS8000 storage and FAS3xxx and/or 6xxx filers regarding SAN FCP performances) regards

1 0

Where to get more tech specs?
by Milazzo Giacomo 06 Jun '08

06 Jun '08

Hi all Long times ago I was able to obtain from some NetApp guys documentation that regarded detailed tech specs of filer appliances with data on performances such us iops, throughput and so on with also comparison between models both from NetApp and competitor too. The data regarded NAS ans SAN (iSCSI and FCP) aspects. Do you know if there are available docs on new filers? Sometime it happens that customers ask us for comparison charts (i.e. now we could need data for IBM DS8000 storage and FAS3xxx and/or 6xxx filers regarding SAN FCP performances) regards

2 1

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