Jan Engelhardt wrote
On Jul 22 2007 00:43, Lars Ellenberg wrote:
Think of it as RAID1 over TCP.
And what does it do better than raid1-over-NBD? (Which is already N-disk,
and, logically, seems to support cluster filesystems)
I don't know about DRDB, but NBD doesn't handle network disconnections
at all (well, almost).
So basically, disconnect a NBD-connected system for a while (switch,
cabling problem, operator error etc.), and you need lots of effort,
perhaps restarts, to get the things to a functioning state (devices
offlined, kicked out etc.).
I wouldn't call such raid-over-NBD setup reliable.
A better question would be: what does it do better than raid1-over-iSCSI?
iSCSI can recover from disconnections very well when configured
properly; but when a disconnection is in place, most of the system will
just "hang/freeze" (that is, from the user perspective - the system will
be waiting for the I/O to complete, until the systems are connected again).
A brief reading of "official DRBD FAQ" didn't give me an answer to that
problem.
--
Tomasz Chmielewski
http://wpkg.org
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