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- Is it advisable to use MS defrag.exe on a RAID 5?
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тАО07-01-2009 10:56 AM
тАО07-01-2009 10:56 AM
Solved! Go to Solution.
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тАО07-01-2009 11:56 AM
тАО07-01-2009 11:56 AM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
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тАО07-01-2009 05:09 PM
тАО07-01-2009 05:09 PM
SolutionThere are some that say that due the very nature of RAID 5, defragging doesn't help much with performance, but I don't see how it can hurt it any.
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тАО07-02-2009 02:12 AM
тАО07-02-2009 02:12 AM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
If you have the battery backup on the P400 it will be reordering operations to minimise head movement, and being SQL there will be little sequential IO anyway.
If you don't have the battery, spend the money on that, which will enable write-back caching.
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тАО07-02-2009 06:10 AM
тАО07-02-2009 06:10 AM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
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тАО07-02-2009 06:16 AM
тАО07-02-2009 06:16 AM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
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тАО07-02-2009 10:31 AM
тАО07-02-2009 10:31 AM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
Now how much improvement will you realize, it is a different story. It can be significant specially if your filesystems are very active in writing (such as deleting files and creating new files all the time)You can draw your own conclusions, install a *filesystem" based io benchmark such as iozone and run a test before and after defragmenting.
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тАО07-02-2009 10:45 AM
тАО07-02-2009 10:45 AM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
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тАО07-02-2009 12:52 PM
тАО07-02-2009 12:52 PM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
Defrag is a good thing, regardless of RAID or JBOD, and has a side benefit of using the filesystem more efficiently (less wasted space).
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тАО07-07-2009 07:07 AM
тАО07-07-2009 07:07 AM
Re: Is it advisable to use MS defrag.exe on a RAID 5?
The backup of the drive with the active database data on it took much longer (I didn't stay around until it was done, so do not know how long it took). It defragged all but one data file.
System performance so far has been good.
Success!
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тАО07-07-2009 07:09 AM
тАО07-07-2009 07:09 AM