[ale] High IOwait

[Danny Cox]

On Thu, 2007-01-18 at 11:37 -0800, ale at jeffx.com wrote:

> Hello all,
> I have a Dell 2650 with a RAID1 drive connected to a Dell PowerEdge
> Expandable RAID controller 3/Di on a SuSE Enterprise Linux 9.3 server
> running 2.6.5-7.283-bigsmp #1 SMP Wed Nov 29 16:55:53 UTC 2006 i686 i686
> i386 GNU/Linux.
> 
> The system is hanging during or after file writes.  If I do something like:
> dd if=/dev/zero of=/home/jefft/file1 bs=512 count=864000 the system will
> eventually hang and come back.  Using sar, iostat, top, I can watch iowait
> percentage climb and climb until it hangs.  Then, when I can gain access
> again, it drops slowly.  The iowait percentage goes up even after the dd
> has completed.
> 
> There is no error messages in dmesg, messages or anyplace else.  Is there
> some mechanism for tuning this?  Any help would be greatly appreciated.


    I don't know about tuning this, but what filesystem is being used?



> PS: I posted this yesterday and it didn't go through.  If you get two
> copies.  I am sorry.


    This is the only one I've seen....

-- 
Daniel S. Cox
Internet Commerce Corporation
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