Slow read from PE6850/PERC4/DC

[Baird, Josh]

I have a PE6850 with a PERC 4/DC with two 300GB 10KRPM drives in a RAID1.

 

/dev/mapper/vg01-optlv:

 Timing cached reads:   3312 MB in  2.00 seconds = 1659.00 MB/sec

 Timing buffered disk reads:  150 MB in  3.05 seconds =  49.17 MB/sec

 

49MB/sec (and its sometimes lower) seems a bit too slow.  I am able to get
~150MB/sec on similar hardware (with a PERC5).  This is a RHEL5.3 x64
machine running the Xen kernel on an EXT3 filesystem.  Anybody have any
ideas why it is so slow?


Thanks,

 

Josh

 

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