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?

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?

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

If they are 80-150KB then yes I think there is an issue. they should be in MB what I think.