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Re: recovering from a disk failure via raid
Steven M. Bellovin(smb%cs.columbia.edu@localhost) said 2008.06.24 11:08:43
> The first choice, of course, is to install a replacement drive. How do
> I initiate the recopy? 'raidctl -R'?
That's what the manpage says. While the reconstruction is going on, run
raidctl -S to tell you when it should be complete.
> (Is it worth just doing that
> without replacing the drive, on the grounds that rewriting a bad sector
> will sometimes cause the drive to switch to a spare?)
Given that you've got the drives in RAID1, you value data integrity. If one
of the drives is starting to show bad sectors, surely it pays to replace it.
> But perhaps it doesn't pay to replace the drive -- it's pretty full,
> and besides, 60GB drives aren't easy to find these days... If I were
> to buy two new drives, what is the best way to set up a RAID1 on the
> new pair? Install one new drive as the sole member of a RAID1 set,
> install everything on it, then replace the old 60GB drive with the
> second and initiate reconstruction?
That seems the safest way of migrating the data, and certainly the way I
would do it.
> --Steve Bellovin, http://www.cs.columbia.edu/~smb
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