On Sat, 2020-05-16 at 08:21 +1000, Cameron Simpson wrote:
> On 15May2020 11:53, Patrick O'Callaghan <pocallaghan@xxxxxxxxx> wrote:
> > I recently had to throw out an old NAS I've been using for over 10
> > years. However I rescued the 2 HDDs and got a dual-slot USB SATA
> > docking station for them. To my astonishment Fedora recognised them
> > immediately as a RAID1 array (formatted with XFS) without me doing
> > anything.
>
> Excellent. So it was running Linux inside.
Yes, an old Debian.
> > However gsmartcontrol reports that one of the HDDs has internal errors.
> > Would it be best to correct these using mdadm (assuming they can be
> > corrected), and if so, how? Or should I do an offline copy with the
> > docking station's "clone" button?
>
> Can you copy the filesystem to another drive? I can't speak to repairing
> a drive, but from outside the RAID1 you should just be able to copy the
> data off. The md stuff does a regular block scan (weekly? something like
> that) which will find out if blocks are bad.
I'm not too worried about the data (I have other backups). I was really
more interested in trying to get the drive working again without having
to replace it. It may be a fool's errand but if I can exercise the
drive's internal bad blocks mechanism it could be recoverable. The
number of failing sectors seems to be quite low.
> > Are there any general recommendations for monitoring these beasties? I
> > don't want to change anything for the time being and will be using the
> > thing mainly for backup, but I see there is such a thing as mdmon which
> > isn't currently running. Should it be? I have no previous experience
> > with md devices.
>
> I run my "chkmdstat" script on a regular cron (eg 5 minutes - something
> frequent). It is silent when there are no problems.
>
> #!/bin/sh -u
> #
> # Simple check and report failed metadevices from /proc/mdstat.
> # - Cameron Simpson <cs@xxxxxxxxxx> 27jun2005
> #
>
> if [ $# -gt 0 ] && [ "x$1" = x-q ]
> then
> shift
> exec sed -n '/^[^ ]/{
> h
> b test
> }
> H
> :test
> /^ *[0-9][0-9]* blocks \[[0-9][0-9]*\/[0-9][0-9]*\] \[.*_.*\]$/{
> x
> p
> }' /proc/mdstat
> fi
>
> out=`"$0" -q` || exit 1
> [ -n "$out" ] && printf '%s\n' "$out"
> [ -z "$out" ]
I'll take a look at that, thanks.
poc
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