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Disk performance for HP Proliant G5 Server

Posted on 2014-03-24
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For a HP Proliant G5 server with 8 x 146GB 10K RAID-5 disk, how to estimate the MB/s for read & write ? How to estimate the IOPS ?

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Question by:AXISHK
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by:andyalder
ID: 39950892
There are some useful graphs in this whitepaper, the controller is a bit later than the P400 but the values are pretty much the same as it's the disk speed that matters. http://tinyurl.com/m9j7c9m (it explains the RAID 5 write algorithm too).
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by:AXISHK
ID: 39955246
In the article, "
Each physical link can support a maixum bandwidth : 6 GiB/s (600 MiB/s)  when 6 GiB/s SAS drives are attached"

Does it mean 6 GiB/s link can deliver 600 MBytes/s of data, with 6 Gigabit/s of SAS ports ? For MiB/s, is it the same as MB/s ?

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andyalder earned 2000 total points
ID: 39957195
HP have made an error there, it should be a lower case b since they are 6Giga bits per second  lanes (with your older card it's actually 3Gbps. Since it's a storage article they use Gi rather than G to represent gibi or 1073741824, you probably already know from the size you buy disks in that disk makers are pedantic and refer to a gigabyte as being 1000000000 bytes. The maximum bandwidth of the SAS bus is irrelevant though, you can't read the data from the platters anywhere near that speed.
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by:AXISHK
ID: 39957886
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