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Symantec Backup Exec takes long to backup, throuput is very low

Posted on 2009-07-09
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Last Modified: 2013-12-01
Hi ,

We have only three servers in our company. All are HP proliant ML150. One of them is having HP storageworks Ultrium 920 backup device. We are doing backup using Symantec backup Exec 11d.
Now, the issue is its takes ages to backup only 450GB of data. 16 to 17 hours. Can you believe it?
I have no idea why it is too slow.
Could someone please help me with this. I can provide more details if anyone willing to help me.

Thanks,
Pankaj
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Question by:tca_ee
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Expert Comment

by:NeilDBlackburn
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what sort of data is being backed up? is it backing up exchange and sql as well ?
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by:tca_ee
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Its backing up exchange, SQl, file server, FTP server(which runs lot of auto schedule processes) ... etc...
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Expert Comment

by:NeilDBlackburn
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you could try  browsing through the job history/log and see which agent is taking all of the time to back up. it should give you the time each section started and finished backing up. this should give you a starting point
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by:tca_ee
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yes there is one specific server which takes more that 9 hours to backup. This server is running most of our core applications and processes though the data on the server is not that large.
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by:NeilDBlackburn
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is it just backing up data on that server or does is that the exchange or sql box?
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by:tca_ee
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Servers:

Server1 - Anti virus server, SQL, Sharepoint, File and print
Server2 - DHCP, DNS, Backup EXec, Exchange
Server3 - SQL, IBIRS, TIMS, etc (Core applications)

i hope this makes sense :-)

Servers 3 takes around 9 to 10 hours atlease while other 2 take only comparatively very low time.
I can send you details Job history if you want.
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Expert Comment

by:NeilDBlackburn
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the reason i was asking what it was backing up was i had an exchange box doing a similar thing recently, i will look at the job log if you wish
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by:tca_ee
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Can you send me your email address as I am not able to attach that job history report here...

Thanks,
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Expert Comment

by:Datedman
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Server three has a gigabit NIC?  

Try copying a file between server 3 and the BE server, see what throughput is on that.
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by:Datedman
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(a large file [g])
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by:tca_ee
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Yes server 3 has got gigabit adapter HP NC7781
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by:Datedman
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Please copy a file over and see if you get gigabit speeds.
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by:tca_ee
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I did, it took 4minutes 15 seconds to copy 2.02GB of data from server 3 to BE server
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by:Datedman
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Okay that's not great but the link speed isn't the issue.  BTW there's a nice little program called DUMeter (http://www.dumeter.com/) that has a nice bandwidth graph, you could monitor bandwidth during the backup as well as CPU on Server 3 and probably get some clues.
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by:tca_ee
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Thanks for your help Datedman however do you sprad some lights what could be the reason for low throuput as other servers have no isse with throuput.
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Datedman earned 250 total points
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I'm guessing your CPU is overloaded during backup?  It's unlikely anyone can just say "oh, it must be <whatever>" with something like this so trying to help troubleshoot. :)  However NeilDBlackburn may have more to say since he has a recently solved similar problem. :)
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by:NeilDBlackburn
NeilDBlackburn earned 250 total points
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is sql running any scheduled tasks at the same time as the backup is running?
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Author Comment

by:tca_ee
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Yes it is.
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by:Datedman
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There goes the CPU. :)
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by:tca_ee
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so you mean to say SQL shceduled processes are causing this delay? There are only 3 or 4 processes running on SQL for few minutes. I was not accepting them to cuase any issue, do they?
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by:NeilDBlackburn
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that may well be your problem then, can you temporarily  stop the scheduled tasks and try the backup, as datedman says it sounds like you are seriously overloading your CPU during the backup

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Expert Comment

by:Datedman
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They only run a few minutes?

I'd watch the server during backup, check CPU use or maybe something disk-intensive is happening?
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by:NeilDBlackburn
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does your AV software run a daily scan? if it does is it during the backup window?
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Author Comment

by:tca_ee
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humm, All right I will watch the server and CPU usage for couple of days and will let you know guys. I believe I just need to monitor server3 which is taking while to backup, am i right?

Thanks for your help.
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Expert Comment

by:Datedman
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Actually you might want to try running that portion of the backup during other hours and see what's going on then?  
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by:stol12
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I have a fileserver with over 3 milion files that takes over 6 hours to backup to a disk in Backup Exec. This is actually caused by the amount of files being backuped. Has nothing to do with network bandwith, it the amount of files that is the problem. I divided my backup in three jobs, they now run in parallel and this cut the backup time almost 50%.

Could you check the backup log and see how many files have been backuped during the 9 hours ?
Do you use Backup Exec SQL agnets to backup the database ?
How about compression ? are you using hardware and software ?

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Author Comment

by:tca_ee
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You are right we are having lot of files on that server... ofcourse they are not that big (1 MB/file) but they are heaps enough , I will let you know how many files on that server
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Author Comment

by:tca_ee
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here you go...
-------------------------------------------------------------------------
Backed up 206706 files in 9866 directories.
Processed 242897676036 bytes in  10 hours,  3 minutes, and  20 seconds.
Throughput rate: 384 MB/min
--------------------------------------------------------------------------
Family Name: "Media created 7/08/2009 5:00:03 PM"
Backup of "\\iap1.tca.local\E: DATA1"
Backup set #3 on storage media #1
Backup set description: ""
Backup Method: Full - Back Up Files - Reset Archive Bit
Backup started on 7/08/2009 at 6:33:16 PM.
Backup completed on 8/08/2009 at 4:36:36 AM.
---------------------------------------------------------------------------------------

Yes we do use Backup Exec SQL agents to backup the database.
We use Hardware compression (if available , otherwise none).

I am interested in how do you run parallel backup and how do you divide backup in three diff jobs. Do you use two separete hardware to run parallel job.

Thanks for your help and looking into this issue




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