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тАО07-09-2010 05:42 AM
тАО07-09-2010 05:42 AM
defrag VM on a san lefthand
i had a server data (windows 2008 R2) host on my san,
yesterday i read in the lefthand documentation that they recommanded not to defrag the file system ?
But for me as it is a data file server if i did'nt defrag it regulary i would have slow down time
what is your opinion ?
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тАО07-09-2010 09:44 AM
тАО07-09-2010 09:44 AM
Re: defrag VM on a san lefthand
defrag is nice for single disks to align the blocks, but in a SAN, with a storage system and multiple disks, the blocks are distributed over many disks/ storages. In an enviroment with many servers, logical drivces and physical disks you can't align the blocks.
Regards,
Patrick
Patrick
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тАО07-09-2010 11:09 AM
тАО07-09-2010 11:09 AM
Re: defrag VM on a san lefthand
Here is some interesting reading:
http://vpivot.com/2010/04/14/windows-guest-defragmentation-take-two
But every environment is different, so the best is if you can try it out.
One warning though: the recommendation not to run defragmentation mostly refers when one is using thin-provisioning or snapshots/smart clones on a volume.
Defragmentation makes volume changes - not good for snapshots - and it can write into previously untouched areas - not good for thin-provisioning.
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тАО07-19-2010 06:31 AM
тАО07-19-2010 06:31 AM
Re: defrag VM on a san lefthand
after reading all those documents, i was not sur for what to do
so, i choice to stop for the moment the defrag and i will search more about.
For information i had a VMWARE VM Windows 2008 R1 on a thin provisionning volume on a san lefhand
nicolas
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тАО09-20-2010 01:33 AM
тАО09-20-2010 01:33 AM
Re: defrag VM on a san lefthand
filesystems were also a lot more primitive back then.
with the advent of raid and then SANs where you have moved to dozens and hundreds of spindles, trying to realign blocks didn't really make sense anymore.
in addition a lot of filesystems now seem to do built in defragmentation.
cheers,
-jason