We have an Xraid that is filling up on one side (1-7). The second
raid (8-14) has limited use. Is there any way to concatenate the
8-14 raid with the 1-7 raid without loosing data?
For example:
Move the data from 8-14 to 1-7.
Expand the raid to become 1-14.
and the trick is not to loose the data from the original 1-7.
The raid tool has the capability to expand a raid, but it looks like
it is for one side only. Expanding 1-4 to include 5-7.
Yours Truly,
Jeff
Xserve RAID cannot build RAID sets across controllers, which is why
you can't use all 14 drives in a single hardware RAID set. However,
you can use Disk Utility to make a software RAID set, which would
basically allow you to use both LUNs as a single, combined pool of
storage. Typically, I would recommend RAID0 in this scenario, as it
evenly stripes the data between the LUNs, leading to improved
performance during I/O operations.
If you don't have a temporary location to offset that data, however,
you could use a concatenated disk set instead. The advantage here is
that concatenated disks can have additional member disks added to them
live. My concern is that I am unsure if adding a disk to a
concatenated set is a destructive process. So, the "safe" way to do it
would be something like getting all data from the right LUN (8-14)
onto the left LUN (1-7) temporarily. Then go into Disk Utility and
create a new software RAID set, specifying concatenated disks as the
type and adding just the right LUN to it. At this point, you'd copy
the data from the left LUN onto the new RAID set. Finally, you add the
left LUN to the RAID set, resulting in a concatenated volume
containing both LUNs.
--
Jason Deraleau (email@hidden)
IT Professional (ACSA, MCSE, Linux+ SME)
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