rj schrieb:
Hi,
How does MD RAID0 layer support disks with different sizes?
All PARTITIONS to create a RAID0 device should be the same size, else
the smallest is the one that counts.
If you have 250GB+500GB+750GB:
Create RAID0 with threee drive using the space from 0-250 GB, then a
RAID1 with the space from 251 to 500, and the last one just normal (or
linear). You can combine them with LVM.
You _could_ create 6 partitions with 250 GB and create a RAID0 across
all of them, but that will hurt the performance a lot.
Best for all in one RAID is possible with "linear" = JBOD.
1. Does it take the size of smallest disk and do the striping
accordingly? This way there would be wastage of space in bigger
disks.
Or
2. Does it stripe across all the space of disks? This way, if striping
is not possible for a disk because it has exhausted the space,
striping will continue or remaining devices (although with
compromising performance for these stripes because they have one disk
less).
What approach md chooses? Also, what approach is taken for RAID5 in such cases?
md does not choose on it's own, you set it up. When using disks like the
example above: RAID 5 across the spave of 0-250 GB.
Thanks in advance.
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