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xen-devel
Re: [Xen-devel] live migration with DRBD devices
> I want to do live migration of domains using DRBD block devices for
> synchronisation between the two Xen hosts with Xen 2.0.7.
>
> I've written a script ( block-drbd ) which binds / unbinds DRBD devices for
> specific domains (with DRBD, only one host can write on a drbd device at
> the same time). This script sets the current host as master (bind) or
> secondary (unbind) in a DRBD "Netword-RAID"
Yep - btw this is fixed with DRBD 8 (still in development), which supports
multiple writers.
How are you handling the sequencing here, though? Move the device to the new
host at *unbind* time from the origin? I'm thinking that the DRBD script
will get run at the destination whilst the origin domain is still running and
using its disk...
> xc_linux_save start 8
> [1130244324.174077] Saving memory pages: iter 1 0%
> Saving memory pages: iter 1 0%Error when writing to state file (5)
> Error when writing to state file (5)
> 2790 [WRN] XFRD> Transfer errors:
> 2790 [WRN] XFRD> state=XFR_STATE err=1
> 2790 [INF] XFRD> Xfr service err=1
>
>
> Does anybody have an idea? I'd appreciate.
Weird... Does this work without your script? Does migration work with a
simpler domain? If you boot a domain from an initrd (removing disk
dependencies), will that migrate correctly?
If it's something weird in the migration-related code, somebody else might
have some further ideas as to what caused this...
Cheers,
Mark
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