Re: Strange Software RAID Problem

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 Forrest,
Thanks for taking the time to do a real simulation of what would happen.  I have
a backup server in place at a different facility that can take over, but that
would require a DNS change that not all ISP's will obey.

This is a very strange situation, and I have learned that before shipping off a
machine one should always make sure that if a drive is lost everything will
occur as expected.

Thanks again,

  Peter

Quoting "Taylor, ForrestX" <forrestx.taylor@xxxxxxxxx>:

> On Tue, 2003-11-25 at 15:23, list@xxxxxxxxxxxxxxx wrote:
> >    Forrest,
> > Here is the output of fdisk -l
> > 
> > Disk /dev/sda: 36.9 GB, 36969185280 bytes
> > 255 heads, 63 sectors/track, 4494 cylinders
> > Units = cylinders of 16065 * 512 = 8225280 bytes
> > 
> >    Device Boot    Start       End    Blocks   Id  System
> > /dev/sda1   *         1      4047  32507496   fd  Linux raid autodetect
> > /dev/sda2          4048      4366   2562367+  fd  Linux raid autodetect
> > /dev/sda3          4367      4493   1020127+  82  Linux swap
> > 
> > Disk /dev/sdb: 36.9 GB, 36969185280 bytes
> > 255 heads, 63 sectors/track, 4494 cylinders
> > Units = cylinders of 16065 * 512 = 8225280 bytes
> > 
> >    Device Boot    Start       End    Blocks   Id  System
> > /dev/sdb1   *         1      4047  32507496   fd  Linux raid autodetect
> > /dev/sdb2          4048      4366   2562367+  fd  Linux raid autodetect
> > /dev/sdb3          4367      4493   1020127+  82  Linux swap
> > 
> >   I am assuming it is interesting that fdisk -l still picks up /dev/sda,
> yes?
> 
> Yes.  Very interesting...
> 
> 
> >   The server is colocated so it will be a little bit of a hassle getting to
> the
> > machine and getting everything back online again.  It is not the biggest
> deal
> > as there are offsite backups, and the machine is fairly new into service.
> > 
> >   Did you see anything in the RAID config that would indicate to you that
> > swapping in a new drive would fix the problem?
> 
> No, not really.
> 
> > 
> >   Basically, I will have a "limited" amount of time in the facility to
> perform
> > the upgrade, so I would like it to go as seemlessly as possible.  What are
> the
> > steps in restoring the array?
> 
> If it were me, and I had good backups, I would just have someone at the
> colocation facility reboot the machine and watch it boot again, making
> sure that the BIOS saw two disks, and that there were no errors when
> trying to start RAID.  Of course, if you do that, sda may not come back
> up, and you may have to do a recovery.  I am going to do a RAID 1
> installation, and see what happens when I lose a disk.
> 
> Forrest
> 
> 
> 
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