[ClusterLabs] DRBD or SAN ?

Digimer lists at alteeve.ca
Mon Jul 17 15:11:04 EDT 2017

On 2017-07-17 03:07 PM, Chris Adams wrote:
> Once upon a time, Ian <ian.ninjabadger at gmail.com> said:
>> I think a big advantage compared to native replication is that DRBD offers
>> synchronous replication at the block level as opposed to the transaction
>> level.
> However, just like RAID is not a replacement for backups, DRBD is IMHO
> not a replacement for database replication.  DRBD would just replicate
> database files, so if for example file corruption would be copied from
> host to host.  When something provides a native replication system, it
> is probably better to use that (or at least use it at one level).

You are absolutely correct. However, OP asked about DRBD vs SAN, not
DRBD/SAN versus backup.

Proper continuity planning requires redundancy (DRBD + clustering),
backup and DR as three separate components.

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