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Hello all;
I run an 8 x 1TB[7.2k] RAID10 system running Xen. I disabled all Xen VMs and have gotten this as a result.
/dev/cciss/c0d1:
Timing cached reads: 19412 MB ...
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- 07-21-2011 #1Just Joined!
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- Jul 2011
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Hardware RAID10 Performance
Hello all;
I run an 8 x 1TB[7.2k] RAID10 system running Xen. I disabled all Xen VMs and have gotten this as a result.
/dev/cciss/c0d1:
Timing cached reads: 19412 MB in 1.99 seconds = 9759.28 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device
Timing buffered disk reads: 250 MB in 3.00 seconds = 83.30 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device
The cached reads vary from 9.5k-12k whereas the buffered reads vary from 80-150.
Are the buffered reads too slow?
- 07-21-2011 #2Linux Guru
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- I can be found either 40 miles west of Chicago, or in a galaxy far, far away.
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The cached reads (almost 10GB/sec) is coming from memory. The buffered reads (~700mbps) are coming off the disc, and that isn't too shabby. Is that 80-150 bytes per read, or 80-150KB per read?
Sometimes, real fast is almost as good as real time.
Just remember, Semper Gumbi - always be flexible!
- 07-21-2011 #3Just Joined!
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- Jul 2011
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The cached reads are fine. I am basing the 80-150MB/S off the average I've seen. I believe those are megabytes. But I have seen raid10 users get up to 400 MB/S
- 08-03-2011 #4Just Joined!
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- Aug 2011
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If they are 80-150KB then yes I think there is an issue. they should be in MB what I think.
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