<br><br><div class="gmail_quote">On Tue, May 31, 2011 at 5:49 PM, Greg Clifton <span dir="ltr"><<a href="mailto:gccfof5@gmail.com">gccfof5@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Obviously, if any of the remaining RAID member disks had a non-recoverable read, the swap would be hosed, but I was just thinking that if it was marginally readable and the disc had to make several read attempts to get a good read, the time required for that process could cause a time out, even though the data could be recovered with DD or such.</blockquote>
<div><br>That sounds plausible. Send itto Mythbusters! <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div></div><div class="h5">
<div>
<br><div class="gmail_quote">On Tue, May 31, 2011 at 5:38 PM, Jim Kinney <span dir="ltr"><<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br><br><div class="gmail_quote"><div>On Tue, May 31, 2011 at 4:13 PM, Greg Clifton <span dir="ltr"><<a href="mailto:gccfof5@gmail.com" target="_blank">gccfof5@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I have no direct experience in the matter, but I would expect that there could well be a problem during the rebuild when (not if) there is a block of data that is difficult, but still possible, to read on one of the RAID members. Seems the retries could cause the no swap panic. No?</blockquote>
</div><div><br>definate maybe. The failed drive was out so it was rebuilding off teh remaining 2. A second drive could have lost a block as well. <br></div><div><div></div><div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div>
<br></div><div><font color="#888888">GC</font><div><div></div><div><br><br><div class="gmail_quote">On Tue, May 31, 2011 at 4:00 PM, Jim Kinney <span dir="ltr"><<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br><br><div class="gmail_quote"><div>On Tue, May 31, 2011 at 3:45 PM, Pat Regan <span dir="ltr"><<a href="mailto:thehead@patshead.com" target="_blank">thehead@patshead.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
On Tue, 31 May 2011 15:34:05 -0400<br>
<div>Jim Kinney <<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>> wrote:<br>
<br>
> On Tue, May 31, 2011 at 3:04 PM, Pat Regan <<a href="mailto:thehead@patshead.com" target="_blank">thehead@patshead.com</a>><br>
> wrote:<br>
><br>
> > On Tue, 31 May 2011 14:49:53 -0400<br>
> > Jim Kinney <<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>> wrote:<br>
> ><br>
> > > swap notes: NEVER put swap on a raid5. If you must park swap on a<br>
> > > RAID rig, mirrored partitions are OK. If swap gets hosed, the box<br>
> > > crashes. The RAID5/6 writes for swap are performance killers. Swap<br>
> > > will do it own striping so don't bother doing a raid10. multiple<br>
> > > swap parts on multiple drive spindles is a good thing. Say 8G RAM<br>
> > > and 4 1TB drives, set up a 4G swap on each of the drives.<br>
> ><br>
> > Putting swap on RAID also means that your server won't go down due<br>
> > to a disk failure.<br>
> ><br>
><br>
> Swap on RAID5/6 means during a rebuild the disk IO times out on swap<br>
> retrieval and the kernel panics thinking the swap is down.<br>
<br>
</div>I have never had this happen, although I can only recall one time that<br>
I've ever had swap on a RAID 5. It was a hardware RAID 5 and was the<br>
only disk available.<br>
<br>
Is this only a problem with software RAID? I'd be surprised if it is...<br>
<br>
In your experience with this situation, where exactly is the timeout<br>
happening?<br></blockquote></div><div><br>Saw this fail once a while back. swap on a hardware raid5 that lost a drive. the last line on the screen before the lockup was <br>kernel panic swap error <br>after the dead drive was replaced (hot swap setup) and the system was still running during the recovery.<br>
<br>OK. So maybe the hardware could detect I'm no fan of RAID5 in any form and dislike hardware in most forms and just decided to take a dump because I was standing there.<br></div><div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div><div></div><div><br>
Pat<br>
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</div></div></blockquote></div></div><br><br clear="all"><div><div></div><div><br>-- <br>-- <br>James P. Kinney III<br><br>As long as the general population is passive, apathetic, diverted to
consumerism or hatred of the vulnerable, then the powerful can do as
they please, and those who survive will be left to contemplate the
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<br></blockquote></div></div></div><div><div></div><div><br><br clear="all"><br>-- <br>-- <br>James P. Kinney III<br><br>As long as the general population is passive, apathetic, diverted to
consumerism or hatred of the vulnerable, then the powerful can do as
they please, and those who survive will be left to contemplate the
outcome.<br>- <i><i><i><i>2011 Noam Chomsky</i></i></i></i><br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>-- <br>James P. Kinney III<br><br>As long as the general population is passive, apathetic, diverted to
consumerism or hatred of the vulnerable, then the powerful can do as
they please, and those who survive will be left to contemplate the
outcome.<br>- <i><i><i><i>2011 Noam Chomsky</i></i></i></i><br>