Peter Grandi schrieb:
Those are as such not very meaningful. What matters most is
whether the starting physical address of each logical volume
extent is stripe aligned (and whether the filesystem makes use
of that) and then the stripe size of the parity RAID set, not
the chunk sizes in themselves.
I am often surprised by how many people who use parity RAID
don't seem to realize the crucial importance of physical stripe
alignment, but I am getting used to it.
Am I right to assume that stripe alignment matters because of the
read-modify-write cycle needed for unaligned writes? If so, how come a
pure read benchmark (hdparm -t or plain dd) is slower on the LVM device
than on the md device?
Oliver
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