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Do you defrag your Raid setup? - Page 2

post #11 of 30
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Quote:
Originally Posted by Mastacator
If windows won't know and doesn't care, then wouldn't it put the files back together when defragmenting, instead of striped across? Still seen as one disk just not striped, so it would be like JBOD instead of raid 0.
I think what he is saying is that Windows only detects 1 logical drive, and the raid controller does the rest.


Quote:
Originally Posted by pauldovi
Contract WD tech support and see what they have to say...
Come on now, that would be way too easy
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post #12 of 30
Quote:
Originally Posted by sccr64472
No, because when the array is created, Windows thinks that the sequential addresses are alternating between the drives. Do you see what I'm saying? If address location 0000 is on the first drive, 0001 is on the second,etc.
So it will defragment the smaller files on each drive that make up the big file broken up by the controller for the raid, and just put them in the right sequence, but not reassembly the file as though it were on a non striped disk array?
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post #13 of 30
Quote:
Originally Posted by Lando95
I think what he is saying is that Windows only detects 1 logical drive, and the raid controller does the rest.
Thats more of what I was thinking, windows sees it as one drive, but the controller reads/writes the data, so it does its job and splits up the file per drive. So defragmenting the controller reads the file "parts", assembles them to a single file, then breaks it back up to be written appropriatly to the raid.
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post #14 of 30
Quote:
Originally Posted by Mastacator
So it will defragment the smaller files on each drive that make up the big file broken up by the controller for the raid, and just put them in the right sequence, but not reassembly the file as though it were on a non striped disk array?
Windows only needs to be able to read/write data, period. It could careless whether that data is on a sata drive, an IDE drive, an optical drive, a striped array, ram,etc. On a striped array, the addresses are split to be physically alternating between the 2 drives (or more in a matrix) and is controlled by the Raid controller. Windows has no idea where the data is coming from and doesn't care. Look at pagefile, windows doesn't care if it's your hard drive or ram that holds the data, it just asks for data to be retrieved and for data to be written. If you defragmented your hard drive, it will attempt to defragment it the exact same way it attempted to write it initially...by sequential addressing.
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post #15 of 30
I defrag my raid array all the time with no ill effects at all. I wish I still had the sites I was researching raid on but the sites basically said that defragging a stripped array is very necessary due to the set cluster size causing some files to be fragged to maintain cluster size. Im at work right now but tonight when i get off ill look for the link to post it to read.
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post #16 of 30
Quote:
Originally Posted by sccr64472
Windows only needs to be able to read/write data, period. It could careless whether that data is on a sata drive, an IDE drive, an optical drive, a striped array, ram,etc. On a striped array, the addresses are split to be physically alternating between the 2 drives (or more in a matrix) and is controlled by the Raid controller. Windows has no idea where the data is coming from and doesn't care. Look at pagefile, windows doesn't care if it's your hard drive or ram that holds the data, it just asks for data to be retrieved and for data to be written. If you defragmented your hard drive, it will attempt to defragment it the exact same way it attempted to write it initially...by sequential addressing.
DING<DING<DING....we have a winner. Windows just sends the files back and forth. The raid controller tells the data where to go. I defrag my HDD's all the time just like there was no raid.
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post #17 of 30
Thread Starter 
Good deal guys, thanks for the info!!
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post #18 of 30
I am suprized that there is not sofware ot already that supports the defraging to both hard drives to make it more profitable...
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post #19 of 30
Quote:
Originally Posted by Strider_2001
I am suprized that there is not sofware ot already that supports the defraging to both hard drives to make it more profitable...
RE that, no software-based program can do that because it will always read it as 1 physical drive no matter what you do...


@ Lando, I ran some ATTO and speed tests that saw my top seek and random read speeds when I first installed and formatted the array, several months later I re-ran them and saw a drop in performance, not that much, but a little bit off the top. I don't know if this could be due to more programs installed or not, perhaps due to defragging.
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post #20 of 30
Defrag on a weekly basis with raid 0 never had a problem for two years
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