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01-16-2008, 08:41 AM
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 A1000 read performance Hi, I have an E4500 with a connected A1000 having 9 x 36 GB disks (I believe they're 15000rpm). The load on the system has gone up quite a bit recently and apparently it's because of weak read performance from the A1000 (probably heavy on disk seeks). For my application we practically only perform read operations, so I don't mind weak write performance. We read two types of records, fixed-size 1KB records and variable-length records betweek 100 bytes and perhaps 1MB. The guy who built the file systems configured it to use RAID 0 on 6 disks and RAID 5 on 3 disks. Now since rebuilding the RAID is quite an undertaking, I thought I'd ask your advice first. :-) How would you set up the A1000 for our application? I'm thinking about using RAID 1 to mirror data across two disks to increase read throughput (we can manage with only half the A1000's capacity). Is this a good idea or is there another RAID level which offers even better read performance? The additional redundancy from RAID 1 would be nice, but it is definitiely second to performance. Would it be a good idea to place the two types of records on different file systems? What do you think? Thankful for any help! / Fredrik Andersson      |
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01-16-2008, 08:41 AM
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| Re: A1000 read performance On 18 Jun 2005 02:58:17 -0700 "Fredrik Andersson" <nablaman@gmail.com> wrote: > file systems? > What do you think? > > Thankful for any help! > / Fredrik Andersson > In my experiance, there is not much you can even do, the A1000 is just SLOW. I get better performance out of firewire connected drives then out of a A1000. -- Barbie - Prayers are like junkmail for Jesus I have seen things you lusers would not believe. I've seen Sun monitors on fire off the side of the multimedia lab. I've seen NTU lights glitter in the dark near the Mail Gate. All these things will be lost in time, like the root partition last week. Time to die. |
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