Joe Thornber said:
> If you are using xfs please be aware that you will need to use the new
> journal log format to avoid misalignment problems (search this list
> for previous posts).
OK, I've read up on the linux-lvm & linux-xfs mailing lists about the
introduction of XFS' version 2 log format on 6/18/02. I'm just a little
slow, and I'm uncertain about how I need to set up the FS to avoid the
misalignment problems Joe mentioned. Feel free to flame me if I should've
posted to linux-xfs, instead.
Will the following work:
mkfs -t xfs /dev/vg0/lv0 -l internal,version=2,sunit=1
If not, does anyone have an example 'mkfs.xfs -l version=2,su=X' command
that would give me a filesystem with the appropriate alignment?
From man mkfs.xfs:
The sunit suboption specifies the alignment to be
used for log writes. The suboption value has to be
specified in 512-byte block units. Use the su sub-
option to specify the log stripe unit size in
bytes. Log writes will be aligned on this bound-
ary, and rounded up to this boundary. This gives
major improvements in performance on some configu-
rations such as software raid5 when the sunit is
specified as the filesystem block size. The equiv-
alent byte value must be a multiple of the filesys-
tem block size. Version 2 logs are automatically
selected if the log su suboption is specified.
With un-striped LVs, should I align my log, or stripe it? And to what
multiple of 512-byte blocks?
Thanks a bunch,
Manuel Gomez
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