backing up /sys
Bob McClure Jr
robertmcclure at earthlink.net
Tue Jun 28 23:39:31 UTC 2005
On Tue, Jun 28, 2005 at 03:12:02PM -0700, Rick Stevens wrote:
> Bob McClure Jr wrote:
> >
> >I'm still deciding whether I want to continue just backing up root,
> >home, etc, var, and usr/local, and restore that on to a freshly
> >installed system, or to make a complete backup from which I can
> >restore to a bare-metal (or possibily minimally installed) system.
>
> Uhm, gee. I back up each filesystem individually with exclusions.
> I do this using two different methods: amanda (to DLT tapes) and using a
> fairly complex "find" command to build ISO images for burning to DVDs.
I have a client that backs up to tape and to alternaing partitions on
a removeable IDE drive (of which he has two that he swaps
occasionally). The latter is set up to be bootable. I thought that
was a little overkill, but I don't any more.
> >You won't be surprised at the reason for my sudden interest in this.
> >Yeah, two disk crashes in the last month.
>
> Wow! Bad hardware, power spikes or the family dog lifting his leg on
> the system?
The first was an antique 8G drive that started whining about a week
before it totally augered in. I replaced it with a disk with FC2 on
it from my file server that I'd replaced with a big 250GB drive, then
backfilled it from backups.
The other was a drive I'd bought three weeks before from a big
electronics bargain house. The box had been opened so the price was
reduced, but it was the only one there of the size and type I wanted.
Needless to say, after returning that drive, I won't be darkening
their door again. The old drive had not yet been recycled, so I put
it back in. That's when I found my backup tapes were fubar. But I
had good incrementals on another machine, so I got most of it back.
I discovered that when I run
mt <any_command>
it returns immediately, but the tape goes on to do the function,
presumably satisfactorily. So my backup script says, in part,
/bin/mt rewind
/bin/mt erase
/bin/mt rewind
/bin/mt reten
echo "backup started at `date`" > $tempfile
if find $dirlist -mount -depth | cpio $cpio_opts > $TAPE 2>>$tempfile
then
.
.
.
So it blows through the mt commands and rolls right in to the cpio
operation, and I presume the tape starts recording mid-stream. I
pulled the contents of the tape to a file, and ran "file <filename>"
and it said "data". The tape is a Travan-4 in an IDE tape drive using
the ide-scsi module. The device is /dev/nst0.
I'm going to run a test tonight, having done the mt steps manually,
and have it go straight to the cpio, and see if I get a recognizable
tape.
> ----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer rstevens at vitalstream.com -
> - VitalStream, Inc. http://www.vitalstream.com -
> - -
> - Do you know how to save five drowning lawyers? No? GOOD! -
> ----------------------------------------------------------------------
Cheers,
--
Bob McClure, Jr. Bobcat Open Systems, Inc.
robertmcclure at earthlink.net http://www.bobcatos.com
God doesn't have (or need) a Plan B.
More information about the Redhat-install-list
mailing list