You didn't indicate where in your setup the SSDs would sit. I would suggest you
look at also replicating the ssd contents using drbd and layering bcache on top
of that, so that in the event of failover you don't have the penalty of cold
caches.
HDDs <-- md/raid <-- LVM <-- DRBD <-- bcache |<-- ext4
SSD<-- DRBD <-- bcache |
There was a talk about something similar, but using flashcache
http://www.youtube.com/watch?v=l910kiEuHOM
Berto
Momar, Inc.
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Andrew Martin
Sent: Thursday, February 13, 2014 11:24 AM
To: [email protected]
Subject: [DRBD-user] Considerations for using bcache on top of DRBD
Hello,
I am interested in using an SSD with bcache on top of DRBD for improved read
performance. Data integrity is the primary concern, so writethrough would be
the bcache mode I use. Has there been any testing done with bcache on top of
DRBD? Are there any things in particular I should consider during testing and
deployment?
The entire stack would be:
HDDs <-- md/raid <-- LVM <-- DRBD <-- bcache <-- ext4
Thanks,
Andrew Martin
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