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martin_nz
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Microsoft Exchange 2010 and replications, backups

Post by martin_nz » Apr 06, 2015 10:05 pm

Hello

I have noticed that over the past couple of weekends my Microsoft Exchange 2010 replication job and backup jobs have increased in the amount of data that is changing and is, therefore, transferred. Normally my replication jobs take less than 10 minutes for an incremental but i notice that the first few jobs on Sunday mornings are taking nearly an hour to run (my replications run from 6am till 7pm 7 days a week) and then they come right and go back to the expected amount of data to be transferred and taking 10 minutes or so for the replication job to run. There is obviously something running on the Exchange server before or during the replication jobs that is causing it to increase in the amount of data to be transferred. Likewise, the backup jobs i have running to two separate places also increase in time.

I've checked the system and application logs on the Exchange 2010 server and theres nothing unusual there.

Has anyone encountered something similar to this?

Shestakov
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Re: Microsoft Exchange 2010 and replications, backups

Post by Shestakov » Apr 06, 2015 11:18 pm

Hello Martin,
Among possible reasons are weekly defragmentation/deduplication processes, antivirus scanning or some weekly Exchange activity which can cause additional changes in data blocks, meaning bigger backup/replication size.
Do you have any of the described activities?
Thanks!

martin_nz
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Re: Microsoft Exchange 2010 and replications, backups

Post by martin_nz » Apr 07, 2015 2:31 am

I do have a scheduled antivirus scan that kicks off on Sunday morning at 2:30am. Would this be enough to change the data blocks? I don't have any weekly defrag or dedup processes in place and I only have the default Exchange activities running.

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Re: Microsoft Exchange 2010 and replications, backups

Post by veremin » Apr 07, 2015 9:48 am

Just for the testing purpose you might want to disable the said scan temporarily and see whether it makes a difference. Thanks.

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Re: Microsoft Exchange 2010 and replications, backups

Post by Shestakov » Apr 07, 2015 10:02 am

Martin, yes, that can be the reason. Since Veeam B&R is an image-based backup solution, it works with blocks, so a change of a file`s timestamp causes copying of the whole block.
What backup method do you use for the backup job, do you make active full backups?
Thanks.

martin_nz
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Re: Microsoft Exchange 2010 and replications, backups

Post by martin_nz » Apr 08, 2015 2:12 am

I don't use active full backups for my original backup job and I use reverse incremental backup jobs as this goes to tape.

martin_nz
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Re: Microsoft Exchange 2010 and replications, backups

Post by martin_nz » Apr 08, 2015 2:16 am

I have disabled my scanning job to see how it goes

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Re: Microsoft Exchange 2010 and replications, backups

Post by itlv2015 » Apr 08, 2015 3:04 am

I'm curious if disabling the AV fixes this issue - If AV is the root cause you could always schedule your full scans right before your full backup every month.

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Re: Microsoft Exchange 2010 and replications, backups

Post by veremin » Apr 08, 2015 8:59 am

Yep, it's not specific to AV, we typically recommend to schedule regular activity that produces a lot of changed blocks to take place right before active full backup.

And if the OP confirms the AV is a root cause, the natural choice will be to schedule it before full backup.

Thanks.

martin_nz
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Re: Microsoft Exchange 2010 and replications, backups

Post by martin_nz » Apr 08, 2015 9:12 am

What do you mean by active full backup?

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Re: Microsoft Exchange 2010 and replications, backups

Post by veremin » Apr 08, 2015 9:43 am

I was talking about backup job that has periodic active full backup scheduled. Thanks.

martin_nz
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Re: Microsoft Exchange 2010 and replications, backups

Post by martin_nz » Apr 15, 2015 5:37 am

Hi All
AN update on this issue - I am still having the long replication time on Sunday mornings even after disabling AV scanning.

Any other ideas?

veremin
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Re: Microsoft Exchange 2010 and replications, backups

Post by veremin » Apr 15, 2015 9:05 am

You might want to open a ticket with our support team and let them identify whether some regular side activities or just Exchange tasks contribute to the increased amount of replication data. Thanks.

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