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List:       evms-devel
Subject:    Re: [Evms-devel] Help to recover from interrupted RAID5 shrink
From:       "Michael [Plouj] Ploujnikov" <ploujj () gmail ! com>
Date:       2006-09-17 1:49:46
Message-ID: 18e575130609161849kc2070e2kc0e0cea6d092d3f2 () mail ! gmail ! com
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Gah! I apologize to Mike Tran for replying to him rather than the
mailing list. I haven't noticed that this is what gmail chose to do
with this list's mail.

I actually solved my problem by degrading the array and using the free
spare for backup while I re-arrange the array.

On 9/16/06, Michael [Plouj] Ploujnikov <ploujj@gmail.com> wrote:
> After re-assembling the array, I tried rebooting into my system. It
> seems to have activated all my raid arrays except for md3. Thus I
> couldn't actually boot past the initrd. Then I booted back into the
> Live CD, and now Gentoo's evms_activate does not seg. fault. However,
> evms thinks that md3 is an available object without any volume on it.
>
> Again, I'm not sure how to safely proceed to remove one of the four
> disks from the raid5 array. That would let me store my data on the
> removed disk and play around with the raid arrays...
>
>
> Thanks in advance.
>
> On 9/15/06, Michael [Plouj] Ploujnikov <ploujj@gmail.com> wrote:
> > Ok, I took a risk, and I did this:
> > mdadm --assemble /dev/md3 /dev/hdc3 /dev/sdc3 /dev/sdb3 /dev/sda3
> >
> > It seemed to have re-constructed the array properly (see linked paste)
> >
> > Then I was even able to cleanly mount reiserfs in read only mode (I
> > didn't want to write just yet) (also see the paste)
> >
> > What I noticed is that the array still has 4 functional elements yet
> > and it's size is unchanged, but the partition has been shrunk.
> >
> > I wonder what I can do now to effectively remove hdc disk from the
> > array without loosing data. ( still can't use EVMS directly)
> >
> > various information paste: http://sh.nu/p/3213
> >
> >
> > On 9/15/06, Michael [Plouj] Ploujnikov <ploujj@gmail.com> wrote:
> > > > Resize root filesystem is dangerous.
> > > I couldn't come up with a decent system layout that would let me have
> > > "root" on a separate partition from other data while efficiently
> > > utilizing my disk space (4x160GB hdds). Thankfully, this time, I made
> > > backups before playing around with EVMS.
> > >
> > > By the way, I am 100% sure the system froze because of EVMS.
> > >
> > > > I think the segfault problem had been fixed with the extra patches for
> > > > evms 2.5.5.  I am not familiar with running evms using gentoo live CD.
> > > > Is there a way to load evms binaries from other media after boot?
> > > Yes, I have a network connection when I use the Live CD.
> > >
> > > I tried, but failed to figure out what patches were applied to the
> > > EVMS on the Live CD.
> > >
> > > I tried compiling the patched EVMS engine, but the Live CD doesn't
> > > even have a patch utility. There is no way to install new software
> > > either.
> > >
> > > I am thinking that I should just try to re-assemble the RAID 5 array
> > > using mdadm to try to cause it to resume the shriking process.
> > >
> > > --
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> > >
> >
> >
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>
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