Reuben Farrelly wrote:
On 13/01/2006 12:18 a.m., Tejun Heo wrote:
On Thu, Jan 12, 2006 at 09:38:48PM +1300, Reuben Farrelly wrote:
[--snip--]
[start_ordered ] f7e8a708 -> c1b028fc,c1b029a4,c1b02a4c infl=1
[start_ordered ] f74b0e00 0 48869571 8 8 1 1 c1ba9000
[start_ordered ] BIO f74b0e00 48869571 4096
[start_ordered ] ordered=31 in_flight=1
[blk_do_ordered ] start_ordered f7e8a708->00000000
[blk_do_ordered ] seq=02 f74ccd98->f74ccd98
[blk_do_ordered ] seq=02 f74ccd98->f74ccd98
[blk_do_ordered ] seq=02 c1b028fc->00000000
[blk_do_ordered ] seq=02 c1b028fc->00000000
[blk_do_ordered ] seq=02 c1b028fc->00000000
Yeap, this one is the offending one. 0xf74ccd98 got requeued in front
of pre-flush while draining and when it finished it didn't complete
draining thus hanging the queue. It seems like it's some kind of
special request which probably fails and got retried. Are you using
SMART or something which issues special commands to drives?
No SMART, although I should be (rebuilt the system a few months
ago..and must
have missed it).
Are there any other things which could be contributing to this?
<scratches head>
Could this be hdparm or something tweaking the drive write cache
settings, etc?
ric
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