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Slow Full backup in SQL SERVER 2008 R2 Expand / Collapse
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Posted Sunday, December 9, 2012 9:29 PM
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Hi every one,

We have database(4.6TB) in SQL SERVER 2008 R2.On weekly bases we take full backup from this database.It used to take 7-8 hours for the full backup.but now It is running for 21 hours and still it is not completed.How can I check what is the problem?


Thanks
Post #1394441
Posted Sunday, December 9, 2012 11:06 PM


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Do you take tape backup? What are the wait types your backup session is hanging on? Check with your backup team to verify the backup throughput (mb/secs).
Post #1394461
Posted Monday, December 10, 2012 3:38 AM


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Aspet Golestanian Namagerdi (12/9/2012)
.It used to take 7-8 hours for the full backup.but now It is running for 21 hours and still it is not completed.How can I check what is the problem?

Check the whether database have grown in recent past ?
Are you using same disk/storage?
I/O utlization? but for this you need to have some historical data for this


-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done
Post #1394521
Posted Monday, December 10, 2012 7:52 AM
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Here is the waittypes:
waittime lastwaittype
58608032 ASYNC_IO_COMPLETION
51 BACKUPIO
0 BACKUPBUFFER
Post #1394633
Posted Monday, December 10, 2012 7:53 AM
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and I am using disk for backup operation.
Post #1394634
Posted Monday, December 10, 2012 8:28 AM


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local disk or NAS\SAN based disk?

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Post #1394651
Posted Monday, December 10, 2012 8:30 AM
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It's SAN bases disk(mount point)
Post #1394653
Posted Wednesday, December 12, 2012 12:05 AM
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Check the throughput of the SAN system as well as configuration of HBA queue depth.
See the virtual file stats if there are high IO read and Write stall( sys.dm_virtual_file_stats).
Capture IO, Memory and CPU counters
Check Memory Related Perfmon Counters
SQLServer: Memory Manager\Memory Grants Pending (Consistent higher value than 0-2)
SQLServer: Memory Manager\Memory Grants Outstanding (Consistent higher value, Benchmark)
SQLServer: Buffer Manager\Buffer Hit Cache Ratio (Higher is better, greater than 90% for usually smooth running system)
SQLServer: Buffer Manager\Page Life Expectancy (Consistent lower value than 300 seconds)
Memory: Available Mbytes (Information only)
Memory: Page Faults/sec (Benchmark only)
Memory: Pages/sec (Benchmark only)


Checking Disk Related Perfmon Counters
Average Disk sec/Read (Consistent higher value than 4-8 millisecond is not good)
Average Disk sec/Write (Consistent higher value than 4-8 millisecond is not good)
Average Disk Read/Write Queue Length (Consistent higher value than benchmark is not good)


Regards,
Ramasankar,
MCTS,MCITP Sql server 2008.

Post #1395456
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