Re: No syncing after crash. Is this a software raid bug?

[Kasper Dupont <70006427576745453539@expires.04.sep.2006.kasperd.net>]

> Do you have write-cache enabled on the mirrors?

How do I find out about that?

> Sometimes I have differences between RAID1 mirrors in 2.4, too.

I have not experienced this with 2.4. However the 2.4 and 2.6
machines are not exactly the same hardware. But AFAIR they both
use Promise controllers and Seagate disks.

> Even with clean shutdown or reboot sequences.

Actually I think some of the differences on the swap device have
happened on clean shutdowns.

> However, in my case, it turns out
> that this always affects areas which are "free" on the filesystem layer.

Does the raid layer have any way to know if they are free and
treat them differently?

> that I have md5sums of all my files which don't show up any
> differences when I either copy the non-zero content over the zeros or the
> other way around.

OK. Then it may very well be free areas. (Or perhaps journal)

> Especially I have never experienced such "normal" differences on my swap
> RAID1 mirrors.

So far I have only seen it happen on swap. I thought that might
be because that machine swaps a lot.

(A copy of any replies to my email address will be appreciated).

-- 
Kasper Dupont -- Rigtige mænd skriver deres egne backupprogrammer
#define _(_)"d.%.4s%."_"2s" /* This is my new email address */
char*_="@2kaspner"_()"%03"_("4s%.")"t\n";printf(_+11,_+6,_,6,_+2,_+7,_+6);
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