> 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
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