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Re: [PLUG] How to break a software RAID mirror?
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In my instance what would be the specific command to fail sbd
I have never used the mdadm tool..
thanks
dan
On Thu, 2007-08-30 at 13:37 -0400, David Coulson wrote:
> Rather than unplug the disk, it's easier just to fail it using mdadm
> and tell the array that it is gone.
>
> That said, the array will bitch that it's missing a disk - You can't
> run RAID-1 with only a single disk.
>
> Not really sure what is trying to be accomplished here, other than
> using sdb for something else - it's not as if there isn't a load of
> unused disk space available.
>
> Brian Stempin wrote:
> > The only raid0 set that I see is /dev/md1. I don't see that volume
> > mounted anywhere. Everything else is a raid0, so those volumes are
> > nothing to worry about. For the sake of testing, I would recommend
> > shutting down the machine, unplugging sdb, and rebooting. If
> > everything seems to be in order (ie, there's no uses for /deb/md1
> > that I'm unable to see), then you should be good! Then, it's just a
> > matter of reconfiguring the raid to not complain that sdb isn't
> > present.
> >
> > On 8/30/07, Dan Roberts <Daniel.G.Roberts@sanofi-aventis.com>
> > wrote:
> >
> > Hello All
> > Thanks for the help!
> > I am running fedora core>>
> > [droberts@kayak /proc]$ uname -a ;
> > Linux kayak 2.6.12-1.1381_FC3smp #1 SMP Fri Oct 21 04:03:26
> > EDT 2005
> > i686 i686 i386 GNU/Linux
> >
> > cat /proc/mdstat
> >
> > Personalities : [raid0] [raid1]
> > md4 : active raid1 sdb2[1] sda2[0]
> > 25599488 blocks [2/2] [UU]
> >
> > md2 : active raid1 sdb3[1] sda3[0]
> > 5116608 blocks [2/2] [UU]
> >
> > md3 : active raid1 sdb5[1] sda5[0]
> > 5116544 blocks [2/2] [UU]
> >
> > md1 : active raid0 sdb6[1] sda6[0]
> > 8192896 blocks 64k chunks
> >
> > md5 : active raid1 sdb7[1] sda7[0]
> > 29704064 blocks [2/2] [UU]
> >
> > md0 : active raid1 sdb1[1] sda1[0]
> > 2048192 blocks [2/2] [UU]
> >
> > unused devices: <none>
> > [droberts@kayak /proc]$
> >
> > So it seems that I am running a mix oF RAID0 and RAID1 on
> > these two disk
> > RAIDED sets..
> >
> >
> > The following is how they are mounted on my system when in
> > use..
> > Filesystem Size Used Avail Use% Mounted on
> > /dev/md0 2.0G 374M 1.5G 21% /
> > /dev/md5 28G 33M 27G 1% /home2
> > none 1004M 0 1004M 0% /dev/shm
> > /dev/md3 4.9G 34M 4.6G 1% /tmp
> > /dev/md4 25G 3.2G 20G 15% /usr
> > /dev/md2 4.9G 190M 4.4G 5% /var
> > /dev/sdc2 20G 9.8G 8.6G 54% /mnt
> >
> >
> > What would you recommend I do at this point to detach sda
> > from sdb so
> > that I could use disk #2 while still having data preserved
> > on disk#1?
> > Remeber that I can still boot my system on disk#3 which
> > isn't RAIDED to
> > anyone..
> > Thanks for any advice!
> > Dan
> >
> >
> >
> > ___________________________________________________________________________
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> > -- http://www.phillylinux.org
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> >
> >
> > ____________________________________________________________________
> >
> > ___________________________________________________________________________
> > Philadelphia Linux Users Group -- http://www.phillylinux.org
> > Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
> > General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
> >
> ___________________________________________________________________________
> Philadelphia Linux Users Group -- http://www.phillylinux.org
> Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
> General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
___________________________________________________________________________
Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
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