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Adding a disk to a RAID 5 set

By paulk42 ·
Assuming I have three 9-GB disks in a (hardware) RAID 5 configuration, is it possible to add a fourth and fifth 9-gb disk to increase the total storage capacity? If so, how do you go about doing it?

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Adding a disk to a RAID 5 set

by TimTheToolMan In reply to Adding a disk to a RAID 5 ...

Hi,

Without knowing what your hardware raid controller is capable of - and the documentation will tell you if there are shortcuts... The only sure way is to...

Backup your data.
Add the new disks.
Rebuild the array, repartition and reformat.
Restore the data.

Cheers,
Tim.

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Adding a disk to a RAID 5 set

by paulk42 In reply to Adding a disk to a RAID 5 ...

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Adding a disk to a RAID 5 set

by JimBb In reply to Adding a disk to a RAID 5 ...

I only know about Compaq RAID controllers. The recent ones can do On Line Drive Expansion (check manuals), while your server is running. There will be a performance penalty though, so ideally you would do this off-hours.
The utility (CPQONLIN.NLMfor Novell, a tool in Compaq's menu for NT/2000) allows you to create a second RAID set, or an entirely new array.

The first solution, a second RAID set, has the advantage that even if you add only one disk, it will have RAID 5 as well. The disadvantage is that this requires some shifting of data, and that can take up to 2 hours for one disk.

The second solution, a second array, has the advantage that it takes a minute or so. You spend more time clicking than the utility spends on creating things. The disadvantage is that this new array of one disk can have nothing else but RAID 0, or two disks cannot go higher than RAID 1.

The end result for your OS is the same: a new "disk", that requires partitioning, and then you create anew drive-letter (NT) or volume (Novell).

In any case:
***MAKE A DECENT BACKUP PRIOR TO EXPANDING***

If you have a power failure during the shifting of the data, you are left with nada, zippo, nothing.

Jim

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Adding a disk to a RAID 5 set

by paulk42 In reply to Adding a disk to a RAID 5 ...

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Adding a disk to a RAID 5 set

by paulk42 In reply to Adding a disk to a RAID 5 ...

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