Environment
Novell SUSE Linux Enterprise
Server 9 (SLES9)
Novell Open Enterprise Server (Linux based)
Novell Linux Desktop 9 (NLD9)
Compaq/HP Smart Array Controller (cciss driver)
Novell Open Enterprise Server (Linux based)
Novell Linux Desktop 9 (NLD9)
Compaq/HP Smart Array Controller (cciss driver)
Situation
The throughput data for the disks
on the Smart Array Controller reported by iostat ("Blk_read/s", "Blk_wrtn/s", "Blk_read", "Blk_wrtn") and iostat -x ("rsec/s", "wsec/s", "rkB/s", "wkB/s" and "avgrq-sz") are all
reported as 0
(zero).
Resolution
Update the kernel.
This issue is fixed as of kernel 2.6.5-7.286 and a fixed kernel isincluded in SLES9 Service Pack 4 and NLD9 Service Pack 4.
The cciss driver in kernels prior to 2.6.5-7.286 did not contain the cciss-cpq-disk-stats patch which makes the driver update the disk statistics kept by the kernel. iostat relies on these statistics for throughput information.
This issue is fixed as of kernel 2.6.5-7.286 and a fixed kernel isincluded in SLES9 Service Pack 4 and NLD9 Service Pack 4.
The cciss driver in kernels prior to 2.6.5-7.286 did not contain the cciss-cpq-disk-stats patch which makes the driver update the disk statistics kept by the kernel. iostat relies on these statistics for throughput information.