[DRBD-user] DRBD 8.4.2: "drbdadm verify" just do not work

Shaun Thomas sthomas at optionshouse.com
Mon Sep 24 15:29:35 CEST 2012

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

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
sthomas at optionshouse.com


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