How much did your Exchange 2010 mailbox store size increase by?
I'm planning out what disks I'm going to need to create on our VMWare setup for Exchange 2010 at the moment; bearing in mind we have to eager-zero thick format the VMDKs I don't want to be putting 100s of GB of unused space on there so looking more closely at current usage.
As it stands we have on-premise Exchange for staff and Live@Edu for students... mail store isn't that big, 28GB for one database and 20GB for the other. Thing is I'm expecting this to grow when upgrading to 2010 due to the lack of single instance storage; question is how much to expect! Currently the physical server has 320GB storage for databases, with around 170GB free.
I know our users store quite a lot of attachments and I'd imagine there's quite a few multiple copies of attachments around so with that in mind I'm wondering if to create a VMDK per database, one for OS drive and one for logs. Not sure whether to go with 50GB or 100GB... certainly the latter gives much more room for expansion moving fowards. As for the log drive... 50GB?
This is for around 100 active users (there's about 300 accounts but some are used a lot more than others)
I guess to some extent having the server on VMWare does make the disk sizing less of a worry as I should be able to extend the storage VMDK in future if required but would prefer to not have to do anything like that if I can help it :)
Would be interested to hear from experiences of those who have moved from 2007 - 2010 and how your mailbox database sizes changed during the upgrade (and indeed how quickly they're growing since!)