[DRBD-user] Any recommendations or cautions on using RAID under DRBD?

drbd at bobich.net drbd at bobich.net
Tue Mar 4 15:39:34 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Tue, 4 Mar 2008, Florian Haas wrote:

>>> Which brings up another question; how does DRBD
>>> handle RAID set failures? Obviously, a mirrored drive's failure would be
>>> transparent, but what about in the case of a striped set? Is there a way
>>> to determine that a striped set has failed and is in rebuild, and
>>> trigger DRBD to fail over to the secondary system where no rebuild is
>>> taking place? Maybe a Linux-HA question?
>> DRBD doesn't know and doesn't care if your RAID stripe is degraded or
>> optimal. That's a job for something else. The underlying partition for
>> DRBD is either there or isn't. There is nothing inbetween. If you want to
>> fail over when the local RAID stripe is degraded, then you'll have to put
>> in some external monitoring, possibly integrated with heartbeat. So yes,
>> probably a Linux-HA question.
> Um, not quite. http://www.drbd.org/users-guide/s-handling-disk-errors.html

This is about handling disk errors. I was talking about whether the 
underlying RAID stripe is degraded or optimal.


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