On Wednesday 27 October 2004 05:33, secmgr wrote:[ ... ]
If you want to do that, then you want raid5. If either a concat or stripe set looses a drive, the data will need to be restored.
Are there known methods/techniques to restore data from failed concat or stripe volumes?
Certainly. It's known as "taking a backup", perhaps to a tape drive or some other form of storage. If you don't have a backup, and you lose a disk in a RAID-0 config, you will effectively lose all of the data.
[ ... ]
Does striping require an additional drive too?
No.
Or it is very similar to concat, except for it stores data across all the spindles?
Yes, that's right.
Does it also mean that it is harder to recover stripped volume?
The question isn't well-phrased: you can't recover data from either if you lose a drive.
As for raid5 - it requires an additional drive. Are there any requirements for the drive? E.g. would it work as having 3 x 200GB for stripe + additional 20GB drive that will be used for control blocks?
No. All of the drives need to be the same size. With RAID-5, which drive is used to hold parity data rotates on a stripe-by-stripe basis to balance out the load.
And what happens here if 20GB drive fails - will I be able to rebuild it and continue using raid?
You can rebuild a RAID-5 volume if a single drive fails without losing data.
-- -Chuck
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