Device mount time

ralphw · Thu Jul 05, 2012 4:01 pm

How long should a device take to mount after a Starwind server is rebooted?

We have a small setup of 1 Starwind server and 1 VMware server and occassionally the power goes out at our office. I've noticed that when the power comes back on and both servers come back online, the automatic start for the VMs on the VMware server always fails because the Starwind server is taking a very long time mounting the device.

We have a 1TB deduplicated disk device and after a reboot of that server, it takes nearly 20 minutes for that device to become fully mounted and ready for our VMware server to be able to establish an iSCSI connection to it.

Is that normal? Or is something wrong?

Thu Jul 05, 2012 4:58 pm

We need to parse down transaction log to do volume recovery. Upcoming version with pure LSFS (Log-Structured File System) will do it much faster but still you're talking about speeding up a recovery process.

ralphw · Thu Jul 05, 2012 6:00 pm

Ahh okay, that makes sense. So it's basically doing a recovery when that happens. I got it.

Does the same thing happen during a graceful shutdown/reboot? I haven't tested this so I don't know, but I'm curious.

Thu Jul 05, 2012 6:10 pm

Deduplicated device takes some extra time on init b/c it needs to take hashes and virtual -> physical translation maps to RAM. We're speeding up this process every next release however

ralphw wrote:Ahh okay, that makes sense. So it's basically doing a recovery when that happens. I got it.

Does the same thing happen during a graceful shutdown/reboot? I haven't tested this so I don't know, but I'm curious.

ralphw · Thu Jul 05, 2012 6:13 pm

Okay. Thanks for the info and quick responses. You guys are great as always.

Thu Jul 05, 2012 6:23 pm

Doing our best to keep everybody happy