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Thread: Hard Drives in Raid question

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    Hard Drives in Raid question

    Im planning on running a raid 1 setup when i do my next upgrade. I currently have a 250GB western digital drive (model number WD2500KS) would i be able to run it with a new WD250 drive or do they need to be completely identical?

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    Re: Hard Drives in Raid question

    You should be able to pair any 2 drives of the same size.

    Remember that RAID 1 does protect you from a disk failure but not a data error of controller failure so use it as part of your back up strategy not as the whole back up strategy.

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    Re: Hard Drives in Raid question

    its more for increased read speeds than it is for backup as it will be an OS drive. Is that the best raid mode to use?

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    Re: Hard Drives in Raid question

    Raid 1 (mirror) doesn't improve the speeds as all it is doing is cloning 1 disc to another in case 1 fails.

    If you want increased speeds, then RAID 0 (stripe) is going to have to be the one you should be looking at

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    Re: Hard Drives in Raid question

    As Lee said for increased performance you would be looking at RAID 0 (striping). This RAID configuration has no fault tolerance so you would need to back up.

    Wikipedia has a good article on RAID:
    http://en.wikipedia.org/wiki/Redunda...ependent_disks

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    Re: Hard Drives in Raid question

    The bad thing about Raid 0 is if one of the HD's fails, the whole raid fails and you will lose all the data on both HD's. On the other size you get the speed increase. I have a 4 HD Raid 0 set up (which I backup every night) with 2 old 250GB western digital drive (WD2500KS) and 2 of the newer 250GB western digital drives and its working great
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    Re: Hard Drives in Raid question

    Quote Originally Posted by Lee @ SCAN View Post
    Raid 1 (mirror) doesn't improve the speeds as all it is doing is cloning 1 disc to another in case 1 fails.

    If you want increased speeds, then RAID 0 (stripe) is going to have to be the one you should be looking at
    Correct for all home RAID setups. I think on some newer enterprise class controllers, they load balance between the 2 disks for reading now.
    I've not looked into it, but on our HP servers, there is no RAID 1 available - only RAID 0+1 even for 2 disks. I suspect it divides the initial disk into stripes then mirrors it then it can read from alternate stripes simultaneously. I haven't tested that so can;t say for sure if it does do that though.
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