On Fri, 31 Mar 2017 18:55:28 +0200, Morten Reistad wrote:

> In article ,
> Martin Gregorie   wrote:
>>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?
>
> We could, but the sneakernet was a lot faster and more reliable.
>
Understood. The Tandems I was involved with were CHAPS gateways, so we
didn't have a disk backup issue other than mirroring: for recovery the
message backup was the copy on the bank's mainframe for outbound traffic
and the copy on the other gateway for inbound traffic. Either would be
automatically re-sent if required as the network came back up.


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

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