Hi,
I have a fundamental question about WHERE it is best to do partititioning.
Here's a concrete example. I have two 3ware RAID-5 arrays, each made up
of 12 500 GB drives. When presented to Linux, these are /dev/sda and
/dev/sdb -- each 5.5 TB in size.
I want to stripe the two arrays together, so that 24 drives are all
operating as one unit. However, I don't want an 11 TB filesystem. I want
to keep my filesystems down below 6 TB.
It seems I have two choices:
1) partition the 3ware devices to make /dev/sda1, /dev/sda2, /dev/sdb1
and /dev/sdb2. Then I can create TWO md RAID-0 devices -- /dev/sda1 +
/dev/sdb1 = /dev/md1, /dev/sda2 + /dev/sdb2 = /dev/md2
OR
2) create /dev/md1 from the entire 3ware devices -- /dev/sda + /dev/sdb
= /dev/md1 -- and then partition /dev/md1 into two devices.
The question is, are these essentially equivalent alternatives? Is there
any theoretical reason why one choice would be better than the other --
in terms of security, performance, memory usage, etc.
A knowledgeable answer would be appreciated. Thanks in advance.
Andy Liebman
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