This also raises another point, which is relevant for both cases - same
exact models of hard disks have different number of cylinders, so if a
RAID partition is created on a larger drive it cannot be mirrored to a
smaller drive.
I have a RAID5 with 5 250G drives, but some are 251 GiB (maxtors), some
are 250.059 GiB (seagate)... say, if I started with 5 Seagates, I could
later replace one of them with a Maxtor, but not the other way around, as
the Seagate are just a tiny bit smaller.
cfdisk says :
sdb1 250994,42
sdc1 250056,74
I suggest, when using software raid, to create partitions that are, say,
100 megabytes or even a gigabyte smaller than the size of the drive. You
lose a bit of space, but if you ever need to change one, you won't feel
stupid with a brand new drive that you can't use because it's a few
sectors too short.
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