Date: Wed, 11 Jun 2008 13:32:42 -0400 From: Paul <bsdlist@cogeco.ca> To: freebsd-stable@freebsd.org Subject: Areca Raid 6 ARC-1231 Raid 6 Slow LS Listing Performance on large directory Message-ID: <20080611173211.A899C1E9E@fep5.cogeco.net>
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Hello, I have a RAID-6 Partition with the Areca ARC-1231 card on a S5000PAL Intel system with 6 disks as part of the raid volume. The system has been set up as Write-back cache and the raid card has a 2 GIG memory cache on it. It is installed on Freebsd 7.0 STABLE with SCHED_ULE enabled. I have a folder with a lot of small and big files in it that total 3009 files. In the user system we have 2200 users in the password file. 1) When I do a ls -lh on the raid 6 array with 6 disks in the array it takes aver 16 seconds before it starts to display anything on the screen. 2) While running a tar command on another shell, the time goes to 28 seconds for the same list to start showing. 3) When I do a ls (with no other options) it starts to list right away. 4) When I do a ls -ln it displays right away as well pointing to the slowdown being the mapping of the users in the db lookup. I have the same directory with the same number of files on a Raid 5 SCSI partition on Freebsd 4.X and it only takes 2 seconds to start displaying the list with the command ls -lh. Any ideas why it takes so long for this on Freebsd 7.0 stable? The partition this folder is on it /dev/da0s1f with a total size of 1.7T and a usage of 63G Any suggestions or help on this would be greatly appreciated. Thanks, Paul
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