On 09/23/2012 05:18 AM, Markus Müller wrote:
Does anybody see real bennefits of drbd against a solution with nbd
and raid1?
From Florian's blog from back in 2009:
"In this case, you have one disk that is local, and another that is
exported from a remote host using NBD or iSCSI. Those two disks are then
mirrored with software RAID. Now this one is really terrible in terms of
management. Role reversal always requires some custom glue, no support
from cluster manages is available whatsoever, and split brain detection
is poor or non existant. So if you really want to go down that alley
then do — but please don’t call it a high availability cluster."
I personally would like to see any possible issues fixed than cobble
together something like that. As such, we've been avoiding using verify
at all, because in the 8.3.x trees, using it often caused DRBD to hang
and require a full system reboot because the kernel module would become
completely unresponsive. I haven't had any problems with it in 8.4 yet,
but I'm still a little skittish around the command in general.
I've been invalidating hosts I know are bad. I too, would like to see
verify become reliable and useful long term.
--
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-444-8534
[email protected]
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