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Adaptec 2810SA extremely fast or extremely slow?
Hi, sorry for bad english..
I've got a Tyan Thunder S2885 and an Adaptec 2810SA, configured as follows: - 5 Maxtor 300gb hard disks on adaptec card - 1 Maxtor 160gb hard disk attached to the motherboard - 3 RAID5 volumes (partitions) on adaptec card - 1 partition 1TB - 1 partition 160 GB - 1 partition 5GB After executing a benchmark test, the results surprised me... All the volumes of the Adaptec card showed the same results: __________________________________________________ __________ READING - sequential reading (large files): 133 MB/s - random reading (large files): 103 MB/s - sequential reading (small files): 59 MB/s - random reading (small files): 54 MB/s __________________________________________________ __________ WRITING - sequential writing (large files): 10 MB/s - random writing (large files): 8 MB/s - sequential writing (small files): 7 MB/s - random writing (small files): 8 MB/s Aren't these results strange for what is said to be an "ideal cost- effective solution for applications where high levels of sustained read and write performance are required, including video streaming, web content, reference data and fixed content storage" ?? What can I do?? I am writing an application that does video acquisition in real time... Thanks a lot, Marco |
#2
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Adaptec 2810SA extremely fast or extremely slow?
In article .com,
Fondazione Distrofici Onlus wrote: _________________________________________________ ___________ WRITING - sequential writing (large files): 10 MB/s - random writing (large files): 8 MB/s - sequential writing (small files): 7 MB/s - random writing (small files): 8 MB/s 10MB/sec for random writes in a raid 5 doesn't sound that far off to me... The ideal situation is very large sequential writes. Check that you have the write cache enabled. Make sure that command queueing is enabled and not set to 1. If your application is very write intensive IMHO you should use RAID 10 rather than 5. Raid 5 just isn't that great for write performance. Aren't these results strange for what is said to be an "ideal cost- effective solution for applications where high levels of sustained read and write performance are required, including video streaming, web content, reference data and fixed content storage" ?? What can I do?? I am writing an application that does video acquisition in real time... Thanks a lot, Marco |
#3
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Adaptec 2810SA extremely fast or extremely slow?
On 6 Set, 17:53, (the wharf rat) wrote:
In article .com, Fondazione Distrofici Onlus wrote: 10MB/sec for random writes in a raid 5 doesn't sound that far off to me... The ideal situation is very large sequential writes. Check that you have the write cache enabled. Make sure that command queueing is enabled and not set to 1. If your application is very write intensive IMHO you should use RAID 10 rather than 5. Raid 5 just isn't that great for write performance. Thank you very much for your answer! I've just changed all my drives and now sequential writing for large files is 90 MB/s. In my opinion there's an incompatibility between Adaptec 2810SA and Maxtor DiamonMax 21 320 GB hard disks. But, please, tell me about "command queueing": where should I see that configuration? In BIOS? Thanks again, Marco. |
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