SQL 2008 timeouts resulting from image backup.

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We are experiencing SQL connection timeouts <>. These appear shortly after Partition locking process on an image backup even when *.mdf and *.ldf files are excluded. Is there a recommendation for preventing this?

Wed, 07/14/2010 - 22:07
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Using build 8398 on Win 2003 Server Std-32bit. SQL error is "SQL Server has encountered 5 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [c:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\db1025_1.ldf] in database [db1025] (5). The OS file handle is 0x00000528. The offset of the latest long I/O is: 0x000001e8307200"

Wed, 07/14/2010 - 22:11
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There are some settings you can adjust under Options | Backup Performance. Maybe bumping some of those lower may help.

-Steve

Thu, 07/15/2010 - 00:28
truwrikodrorowrelupicugojestutroclulachosaswunuhospikigawakijosaswenomaruclojeueclikaspedrubewidebrisubrohutrurifruuagothunugekedrumucisiuobrobrecrupeslapuswosluprothethibakaslechurathikucli
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Hello Jeff and Steve!

Thank you for finding time to open the thread regarding this question, and many thanks to Steve for valuable assistance!

Dear Jeff,  I entirely understand your concern and will do my best to help you.

First of all I'd like to mention that the database anyway needs to be suspended during the full backup for proper integration. Please keep in mind that should you decide not to suspend the DB, it may either fail to backup correctly or will be corrupted after the recovery. The database services should be suspended during the process of creation of snaphot. But normally it doesn't take more than 3-5 seconds.

As a workaround for this case in order to reduce the DB downtime to 3-5 seconds, I'd advise you to use Before/after data capture commands. You can find more details about it in the User's Guide, chapter 6.3.4, p.74. Examples of batch files used can be found here, at the bottom of the page.

I would appreciate if you could keep me posted regarding this case, so that I could provide you with further assistance if required.

Should you need anything else or have any further questions - feel free to contact us at your earliest convenience, we will be happy to help you!

Thank you!

Thu, 07/15/2010 - 06:18
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Do you have an example of a batch command to suspend SQL databases. Should I be using VSS in this instance to shorten the database offline time?

Fri, 07/16/2010 - 17:55
truwrikodrorowrelupicugojestutroclulachosaswunuhospikigawakijosaswenomaruclojeueclikaspedrubewidebrisubrohutrurifruuagothunugekedrumucisiuobrobrecrupeslapuswosluprothethibakaslechurathikucli
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Hello Jeff,

Thank you for replying.

We actually have a dedicated article for this, which has instructions together with ready made batch files for suspending databases. You can take a look at it here.

You can definitely try using VSS first and see how it works for you. The batch files in the article that I mention were developed in order to workaround issues related to VSS usage, or, to suspend databases that do not support VSS.

If you need additional assistance, or have any other questions, please let me know.

Thank you.

Fri, 07/16/2010 - 19:13
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