Re: Offline defrag

Brick-level backup is infamous for being slow, redundant and troublesome (but white space is not backed up during brick-level backup).

Switch to Store backup and you may get 30GB/h and up transfer rates. After performing successful online backup you can worry about reducing white space (you can only reduce it, but never eliminate). You can reduce it either with the help of ESEUTIL or by moving mailboxes to the other database, whacking .edb+stm, moving mailboxes back. I strongly recommend ESEUTIL approach.

I also would suggest imposing storage limits.

File-system defrag will not make a difference because database access is random by nature, not sequential.

John Smith wrote:
we have roughly about 500 users, the last backup took 58hrs to complete and it didn't backup all the storage groups. we are performing a brick level backup. To give some idea on how our backup works, we backup to disk over night, and in the morning this is staged off to tape. however we have not had a successful backup for couple days because the throughput is sooo slow. sometimes we see multiple backup schedule running because the last backup didn't complete the allocated backup window.

just to make things clear, the total sum of our database are 680gig, our biggest database 210gig with 150gig whitespace ( Ouch ). the rest of the database are between 50-100gig and each database has roughly 12gig of whitespace. Going through the event log and filtering for event id 1221 and adding up all the whitespaces, we can roughly save 230gig of space and reduce the databases of 380gig total.

I can handle the whitespace issue if the backup performance is quicker, but at the moment backup is slower than snail with arthritis.

can I also ask if file system defrag would improve anything, if so, would this require the stores to be dismounted.


"Kirill Palagin" <kpalagin@xxxxxxxxxxxxxxxxx> wrote in message news:ODv0vFZ1GHA.1288@xxxxxxxxxxxxxxxxxxxxxxx
Having 10GB of whitespace in databases this big should is expected and should not be cause for offline defrag.
How many users you have and how long backup takes? Hopefully, you are not doing brick-level backup.


John Smith wrote:
Hi all,

I am new to exchange, we have recently migrated from lotus notes, where users had unquoted mail files. When we have moved to exchange 2003, we have decided to introduce quota with the mail system. so we've created couple mail stores - 8 in total - and moved users about.

since we've moved users about, out database grew from 370gig to 680gig. I have checked the event log and there is a lot 1221 event id, it seems that each mail store has approximately 10gig of free space.

the other thing, our backup has also taking hit, it is extremely slow, it takes forever to backup. the exchange through put for the backup has takes a huge performance hit. I think the backup time interferes with online defrag, I know the obvious thing to do is run the backup another time, but because of the size of the databases being backed it is continuously backing 24/7.

I have heard about eseutil, but alot of people are advising against it, I don't have a recent backup either, I want to fix all this issues before it becomes a nightmare.

please advice.
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