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02-26-2006 11:52 PM
02-26-2006 11:52 PM
Disk array performance
I have just installed two identical rp4440 servers connected via SAN to an EMC CX300 Array. I am benchmarking performance and am surprised by what I've seen so far. One server will be for running a Production Sybase database server the other for Test. The CX300 contains 45 73GB 10000RPM disks. I have allocated 32 of the disks to Production in 4 8-disk raid 10 groups. I have attempted to spread the Sybase data evenly across the raid groups. The Test server database is allocated on a 6+1 Raid5 group. (Total databases about 133GB currently.) I carved off 9 luns for production vs. 2 for Test. LV allocations for the two servers are identical with 9 each (same size, same database allocations,all raw). What surprises me is the Test server is outperforming Production. I am running a nightly warehouse build process which runs about 7 hours on our current system and is around 3 hours on the new ones. There is a lot of write activity involved including database logging. I've just started investigating and know you don't have all the details, but at face value can anyone explain the small raid 5 group outperforming the raid 10? (2 hours 20 min. vs 2 hours 50 min.)
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02-27-2006 01:39 AM
02-27-2006 01:39 AM
Re: Disk array performance
1. You probably have a better tuned DB instance on your test environment that's using RAID5.
2. Your datafiles on your test environment are probably better laid out.
2. Your datafiles on your test environment are probably better laid out.
Hakuna Matata.
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