Hi guys, I'm trying to debug a SSD drive that's the backing device for my secondary node.
The primary/secondary are sync'd (protocol C) and everything goes fine until I get to testing fail-over, e.g.on the primary "drbdadm secondary drbd-sr1", and on the secondary "drbdadm primary drbd-sr1". When I do this the secondary locks up for about 5 minutes (SSH session drops) then it starts responding again and I see drbd has now dropped into diskless mode. I'm thinking there might be IO errors occurring with the underlying disk and perhaps drbd is automatically detaching it. Right now I'm running badblocks on the backing device and seeing if it can find any problems. In the meantime I've been trying to figure out how to get more information about IO errors from drbd. My devices are configured with "detach" as recommended ( http://www.drbd.org/users-guide/s-configure-io-error-behavior.html), however, I'm not sure how to find out more information about when this event occurs. Are there any debugging options I can enable that would help me see IO error details that caused a detach? Thanks! Andrew
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