Hello,
I have found conflicting info on the internet and in the archives and
would like to clarify something.
I have a software raid 5 array created using raidtools2 on a 2.4.2x
kernel on debain stable, currently the array consists of 3 active 120GB
IDE drives and one spare drive, so my raidtab file appears like this:
raiddev /dev/md0
raid-level 5
persistent-superblock 1
chunk-size 256
nr-raid-disks 3
nr-spare-disks 1
device /dev/hde1
raid-disk 0
device /dev/hdg1
raid-disk 1
device /dev/hdi1
raid-disk 2
device /dev/hdk1
spare-disk 0
I need to increase the size of the array, can I just change hdk1 to
raid-disk 3 and then run
Raidhotadd /dev/hdk1 /dev/md0
On one web site I found it says that this works as it re-builds the data
across all available drives stripping the data and parity across the
entire available array in the same way that it would if I was re-adding
a drive that had been marked as failed and kicked out of the array. This
would see logical to me as surely all the required data & parity must be
there to allow it to rebuild the array when you do add a failed drive
back in normally.
But elsewhere in this lists archives I found a post that said that at
creation time the raid 5 array is fixed to a set size and number of
disks and that trying to add to this will result in the destruction of
the array.
What is true? Is there a tool to add drives to the array, or do I have
to copy everything off, make a new array and then copy it all back?
Help appreciated as always.
Rolf
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
