On Fri, 31 Mar 2017 16:11:09 +0200, Morten Reistad wrote:

> At a PPOE with the Tandem Guardian we used this three-way mirror to take
> backups. We included the spare in the raid, synced it; then took another
> drive out of the raid, removed it from the cabinet and sent it for
> backup storage. This way we circulated around 20 drives for each of the
> three raids/mirrors on the machine. The backup storage was in the
> disaster recovery site, so we could be online within round 10 minutes by
> booting from the backups, and be synced into a mirrord config within
> around 90 minutes. Drives were a lot smaller then.
>
> Last year I copied this setup for my home office.
>
Looks good. I was never sysadmin for Guardian so never got involved with
its disk management. I take it you didn't have a connection between the
sites or not a lot of bandwidth, or IIRC you could have simply declared
that pairs of disks on the two machines mirrored each other?

At one time I was sysadmin for an IBM S/88 (a badge-engineered Stratus)
which used RAID1 mirroring, with backups done as you describe. The one I
looked after was just a development system with a single mirrored pair,
so the backup disk of the day was just rotated onto a shelf.



--
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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