toasters December 2003

toasters@lists.teaparty.net

68 participants
73 discussions

Large directory performance bug? F760/6.1.2R3/Linux/2.4.20
by Chris Miles 01 Dec '03

01 Dec '03

Hi, we have over 20 webservers running a web application and serving all the data off a Netapp NFS mount. Netapp CPU normally sits at around 20-40% and NFS response is good. Today we hit what appears to have been a bug of some sort. All of a sudden, with no apparent increase in client connections, the F760 CPU went to 80-90% and the load on all the webservers rose sharply (from approx 0.5-1.5 up to 15-20). The site response went down the drain (20+ seconds for a page that normally takes under 1 second). It appeared to be caused by the application doing readdirs (along with other operations: read/write/getattr) on a specific directory, which at that time held about 70,000 files. We fixed the problem by disabling the readdirs within the application and also reducing the number of files in that directory down to about 45,000. We don't know exactly which fix (stopping readdirs or removing the files) did the trick, but after that Netapp CPU dropped back to normal and the webservers were happy and the site responsive again. It appeared that the combination of all the operations on the large directory were causing the NFS clients to hang and the Netapp CPU to max out. Although at the same time, other NFS operations were still performing at a reasonable speed (ie, the whole Netapp was not locked up). Any ideas on a bug or limitation on either the Linux or the Netapp side with regards to large (70,000+ files) directories? Info: Netapp F760C ONTAP 6.1.2R3 Linux 2.4.20 (Redhat) Mount options: rw,hard,intr,vers=3,proto=tcp,rsize=32768,wsize=32768 Cheers, Chris -- Chris Miles http://chrismiles.info/

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Maintenance on a filer with FCP connections...
by Don Hickey 01 Dec '03

01 Dec '03

When rebooting a filer that has SAN connections via FCP what is the "proper" procedure? Should all LUNs be unmounted from their respective systems first? Is a sync all that's required or is that even necessary? We have a few oracle databases on netapp LUNs and I need to upgrade the os and reboot. Just didn't want to shoot myself in the foot. thanks, -- Don

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ndmp DAR veritas FP3
by Jerry 01 Dec '03

01 Dec '03

I was wondering if anyone is using DAR with Veritas which came out in FP3. I am currently upgrading from Maintenance Pack 3 to Feature Pack 3 (and eventually feature pack 5) to get the DAR feature, but I was wondering if anyone had any bad/good experiences to share with DAR and with upgrading veritas to support it. Jerry __________________________________ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/

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toasters December 2003