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I have two identical servers. The only difference is that the first one has Maxtor 250G drives and the second one has Seagate 320G drives. OS: CentOS-4.4 (fully patched) CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550Sx-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled On the first server I have decent performance. Nothing spectacular, but good enough. The second one

I have two identical servers. The only difference is that the first one has Maxtor 250G drives and the second one has Seagate 320G drives. OS: CentOS-4.4 (fully patched) CPU: dual Opteron 280 Memory: 16GB Raid card: 3ware 9550Sx-8LP Raid volume: 4-disk Raid 5 with NCQ and Write Cache enabled On the first server I have decent performance. Nothing spectacular, but good enough. The second one

...he Battery. I am using FreeBSD 7.0-Release (tried both 4BSD and ULE) using AMD64 and the 3ware performance for writes is just plain horrible. Something is obviously wrong but I'm not sure what. I've got a 4 disk RAID 10 array. According to 3dm2 the cache is on. I even tried setting The StorSave preference to "Performance" with no real benefit. There seems to be something really wrong with disk performance. Here's the results from bonnie: File './Bonnie.2551', size: 104857600 Writing with putc()...done Rewriting...done Writing intelligently...done Reading with get...

...Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP matrix 20G 30546 6 26301 3 129709 3 135.2 0 before (with 2.6.16) I was at about 42MB for writing and 131MB for reading. Have you got any ideas what I can do more for tuning? I already did: * StorSave: Balanced (I don''t want to set it to Performance, for obvious reasons) * used noirqbalance parameter to prevent "nobody cared" messages related to usb irqs * use xfs (much faster than ext3) * mv /lib/tls /lib/tls.disabled mv /lib/tls64 /lib64/tls.disabled ---> remarkabl...