Shadow Copies not growing to use maximum space
Posted on 2011-03-09
I have a 2003 SP2 server that has been in production for quite some time, running smoothly - but recently I've been having a issue with a shadow copy protected volume.
The volume is setup to capture two shadow copies - 7am and 12pm every day. The storage area is set to a maximum of 27877MB (27.224GB). In the past this worked fine.
The problem I'm having is that the Shadow Copies are not growing to use all of the 'Maximum Shadow Copy Storage space'. The 'Used Shadow Copy Storage space' is at 10.962GB - I've seen it go a bit higher, but never over 12GB. As a result, I'm not capturing as many prior versions of the volume as I would like.
There are no errors in the System log. Running 'vssadmin list shadowstorage' confirms that max size is 27GB. Running 'vssadmin list writers' shows all states as 'stable' and no errors. Running 'vssadmin list providers' shows there is only one provider (Microsoft Software Shadow Copy Provider, version 126.96.36.199).
The only change that occurred was this server was recently setup to also use DPM 2010. DPM captures the same volume, but at 2am. This issue started occurring *after* DPM 2010 was set to protect this server. (DPM 2010 is working according to expectation.)
I'd appreciate any ideas about how to narrow down why the 'Maximum Size' setting is seemingly being ignored. Fixing this would double the number of shadow copies I have for this volume.