On Fri, December 10, 2010 12:16, Mark Foster wrote: > On 12/10/2010 07:33 AM, J. Epperson wrote: >> Can anyone shed any light on this for me? BTW, the only differences >> I'm aware of on the systems is that the slow system has PERC firmware >> 5A2D BIOS H433 and the fast one has fw 516A and BIOS H418. RAID >> adapter and container settings match across systems, as do e2fstune -l >> settings. No hardware errors showing up in /var/log/messages or dmesg. >> > > I have a hunch you'll want to check the output of blockdev --report > /dev/sda on each system > > It might be a simple as running this on the slower one... blockdev > --setra 32768 /dev/sda >
Thanks for the input. Both look the same: RO RA SSZ BSZ StartSec Size Device rw 256 512 4096 0 143114240 /dev/sda I set to 32768 on both and re-did my dd test, but with pretty much the same results, about a 2.5X difference, compared to the ~4.5X reported by the DBA using cp command. [r...@p1fi prod11idata]# time dd if=/dev/zero of=/u03/tmp/zero bs=4096 count=500000 500000+0 records in 500000+0 records out real 0m16.640s user 0m0.268s sys 0m7.955s [r...@d1fi prod11idata]# time dd if=/dev/zero of=/u03/tmp/zero bs=4096 count=500000 500000+0 records in 500000+0 records out real 0m42.660s user 0m0.302s sys 0m10.947s _______________________________________________ Linux-PowerEdge mailing list Linux-PowerEdge@dell.com https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
