[CentOS] Re: pvmove speed

[Scott Silva]

on 2/12/2008 9:24 PM Joseph L. Casale spake the following:
>> But I really have a hunch that it is just a lot of I/O wait time due to
>> either metadata maintenance and checkpointing and/or I/O failures, which
>> have very long timeouts before failure is recognized and *then*
>> alternate block assignment and mapping is done.
> 
> One of the original arrays just needs to be rebuilt with more members, there are no errors but I believe you are right about simple I/O wait time.
> 
> Going from sdd to sde:
> 
> # iostat -d -m -x
> Linux 2.6.18-53.1.6.el5 (host)  02/12/2008
> 
> Device:         rrqm/s   wrqm/s   r/s   w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
> sdd               0.74     0.00  1.52 42.72     0.11     1.75    86.41     0.50   11.40   5.75  25.43
> sde               0.00     0.82  0.28  1.04     0.00     0.11   177.52     0.13   98.71  53.55   7.09
> 
> Not very impressive :) Two different SATA II based arrays on an LSI controller, 5% complete in ~7 hours == a week to complete! I ran this command from an ssh session from my workstation (That was clearly a dumb move). Given the robustness of the pvmove command I have gleaned from reading, if the session bales how much time am I likely to lose by restarting? Are the checkpoints frequent?
> 
> Thanks!
> jlc
I know it is too late for this one, but I usually run long running remote 
commands in a screen session just in case I lose the session.

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