AACRAID Issue on Dell 2650 RHEL3 update 6

[Santhosh kumar]

All,


Dell 2650 servers running Redhat 3 update 6 w/AACRAID driver are performing
poorly -- High I/O wait, system sluggishness/non-responsiveness with disk
access. This problem can be duplicated with this command dd if=/dev/zero
of=testfile bs=1G count=10.  I have attached the top output below. At
present we are not in position to upgrade the Kernel.


I have tried to resolve this issue by disabling the Hyper threading and
changing the PERC card settings to WRITE_BACK and CACHED_IO from the default
WRITE_THRU and Direct_IO.



*Please help me to reslove this isse ***



Here are my server details.

[root at stpesx12 root]# uname -r

2.4.21-37.ELsmp

[root at stpesx12 root]# dmesg |grep AAC

AAC0: kernel 2.8-0 build 6089

AAC0: monitor 2.8-0 build 6089

AAC0: bios 2.8-0 build 6089

AAC0: serial 727620d3

AAC0: 64 Bit DAC enabled

[root at stpesx12 root]# dmesg |grep aac

Red Hat/Adaptec aacRAID driver (1.1-5[2361])



09:33:51  up  3:12,  3 users,  load average: 0.69, 0.15, 0.05

62 processes: 60 sleeping, 2 running, 0 zombie, 0 stopped

CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle

           total    0.1%    0.0%    7.2%   0.0%     0.3%   *92.2%*    0.0%

           cpu00    0.0%    0.0%    2.1%   0.0%     0.0%   *97.8%*    0.0%

           cpu01    0.0%    0.0%   25.0%   0.0%     1.1%   *73.7%*    0.0%

           cpu02    0.1%    0.0%    1.5%   0.0%     0.2%   *98.0%*    0.0%

           cpu03    0.3%    0.0%    0.1%   0.0%     0.0%   *99.4%*    0.0%

Mem:  5907384k av, 5889296k used,   18088k free,       0k shrd,   22132k
buff

                     81088k actv, 4633196k in_d,   96100k in_c

Swap: 4194296k av,       0k used, 4194296k free                 3180708k
cached



Thanks

Santhosh
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.us.dell.com/pipermail/linux-poweredge/attachments/20071130/5b7b0790/attachment.htm