[linux-lvm] lvm over raid5 - sizes
Scott Serr
serrs at theserrs.net
Sun Feb 27 23:13:31 UTC 2005
I have alot of ideas going through my head. Here is my situation:
I've had 5 IDEs with 4 partitions each. Each partition is in a RAID5
md:stripped.
md0 = hda5, hdb5, hdc5, hdd5, hde5
md1 = hda6, hdb6, hdc6, hdd6, hde6
md2 = hda7, hdb7, hdc7, hdd7
md3 = hda8, hdb8, hdc8, hdd8
md0-3 are in an LVM2 volume group. This makes it really nice when
expanding or adding another disk because I just pull say md3 out of the
volume group... rebuild md3 bigger and then add it back.
I just upgraded, replacing hde with a bigger disk and while the pvmoves
are taking FOREVER... I thought what is the right size for the RAID5
chunk-size?
I have chunk-size = 128k right now.
The pv extents size is (always?) 4MB.
Am I just shooting myself in the foot by not making my RAID chunk size
atleast 1MB? Can someone give me a reason to increase it?
BTW, I'm using reiserfs with default sizes and my needs are mixed. I
have many couple gig files, but also some "rsyncs" of client machines as
backups/archives.
Thanks for any ideas,
Scott
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