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add new HDD on an existig RAID 0
- Thread starter ashlyjay
- Start date
ArizonaGeek
IS-IT--Management
Are you asking to add a third hard drive to an existing RAID 0 or take a hard drive out and replace it?
You should be able to turn the machine off and replace a hard drive and the PC should rebuild the RAID. As long as the drive is the same size or bigger, if bigger it will shrink to the size of the drive in the RAID.
Nothing is 100% so make sure you have a good back up before doing anything.
Cheers
Rob
The answer is always "PEBKAC!
You should be able to turn the machine off and replace a hard drive and the PC should rebuild the RAID. As long as the drive is the same size or bigger, if bigger it will shrink to the size of the drive in the RAID.
Nothing is 100% so make sure you have a good back up before doing anything.
Cheers
Rob
The answer is always "PEBKAC!
Johnthephoneguy
Technical User
I didnt think you could simply replace a HD in raid 0 configuration? Thats the downfall to Raid 0, if 1 drive fails you lose all data.
Raid 0 is between 2 disks ONLY you CANNOT add a third disk to a raid 0. the only way to increase the size of a Raid 0 is to use to larger disks.
However, you can go with a Raid 5. Which is a collection of 3 or more disks. 1 disk contains parity information (security against losing data). what this does is if one of your disks fails the disk containing the parity information will rebuild the raid. the storage capacity of the raid 5 will be the total of all disks used MINUS one disk (one disk is used for parity info, the rest are your storage)
Or you can use a Raid 0+1. (sometimes referred to as a raid 10 or 1+0) A raid 1 is a mirror for security purposes, the raid 1 writes EXACTLY the same info as on the raid 0 so you have an automatic backup. this way if your raid 0 fails you can replace the bad drive in the raid 0 and image the raid 1 to the repaired raid 0. this option requires a MINIMUM of 4 drives of the same size, and again the only way to increase storage capacity is to use larger drives.
JohnThePhoneGuy
"If I can't fix it, it's not broke!
Raid 0 is between 2 disks ONLY you CANNOT add a third disk to a raid 0. the only way to increase the size of a Raid 0 is to use to larger disks.
However, you can go with a Raid 5. Which is a collection of 3 or more disks. 1 disk contains parity information (security against losing data). what this does is if one of your disks fails the disk containing the parity information will rebuild the raid. the storage capacity of the raid 5 will be the total of all disks used MINUS one disk (one disk is used for parity info, the rest are your storage)
Or you can use a Raid 0+1. (sometimes referred to as a raid 10 or 1+0) A raid 1 is a mirror for security purposes, the raid 1 writes EXACTLY the same info as on the raid 0 so you have an automatic backup. this way if your raid 0 fails you can replace the bad drive in the raid 0 and image the raid 1 to the repaired raid 0. this option requires a MINIMUM of 4 drives of the same size, and again the only way to increase storage capacity is to use larger drives.
JohnThePhoneGuy
"If I can't fix it, it's not broke!
Johnthephoneguy said:
John,
You cannot add a third disk to an existing 2-disk array, but if you're starting from scratch and building a RAID 0 array you can have as many disks as you'd like:
You CAN add a third disk to a RAID 0 array, but not simply by connecting a third disk. You could clone the existing 2-drive array to another (4th) disk, then format and rebuild the array from scratch in RAID BIOS, then clone the 4th disk back to the 3-disk RAID 0 array (whew!).
I think Rob was thinking about RAID 1 when he said:
Rob said:
This is not true for RAID 0...any disk missing or failing will damage the array beyond recovery.
Tony
Users helping Users...
ArizonaGeek
IS-IT--Management
wahnula said:
Very true. For some reason I had it in my head RAID 1. Guess that's what I get for trying to answer questions while working.
Sorry...
Cheers
Rob
The answer is always "PEBKAC!
Same for RAID 5 and 6. RAID 6, you need 4 drives, RAID5 you need 3 drives, but you can have a fourth as a hot spare, allowing the failure of 2 drives (which is what ADG RAID6 is). If you are going to add a third drive to an array, you should make it a RAID5 array, if your hardware/software supports it. That is striping like RAID0 but with parity, so you can lose a drive and still be good.
Burt
Burt
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