Right now on our Exchange 2003 systems we generate around 13 gigs in the logs. When we setup exchange 2010 should I doubled that amount for the log files drive?
I know that Exchange 2010 stores data in the mailbox database differently than 2003 and 2007. However, I am not sure how that impacts the size of the transaction logs.
I would monitor your current Exchange incremental backups since they only include trans logs. Go back at look at the largest amount of data backed up in a single night. Take that size of data (per database) and multiply by 7. That will give you enough storage to handle restoring all the transaction logs for a week in case you are in a disaster recovery situation. I am assuming you do nightly incrementals and weekly fulls.
Unfortunately, I do not know the size impact of Exchange 2010 transaction logs versus Exchange 2003. However, I will try to find something out.
There is no simple way to answer that question. Simply installing Exchange 2010 'should' not break anything. However, making 2010 work is another conversation.
An upgrade from 2003 to 2010 requires lots and lots and lots of planning. After that, do some more planning.
Since you started the thread with concerns about disk space, remember that single storage is forever gone in 2010. A 1MB message including an attachment sent to 100 recipients just consumed 100MB even if they are in the same database. The rule of thumb is you will immediately increase space by 20% when mailboxes are moved. There is some compression in 2010 but only for messages formatted in HTML and plain text so be sure your users are not using rich text formatting.
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