>>> On Thu, 20 Jul 2006 10:08:22 -0400, Ming Zhang
>>> <mingz@xxxxxxxxxxx> said:
[ ... ]
mingz> hope i never need to run repair,
A ''strategic'' attitude :-).
mingz> but i do need to defrag from time to time.
As to defrag, I reckon that defrag-in-place is a very bad idea,
but I have to admit that contrary evidence exists, and I was
rather surprised to read this:
«> How many people defrag their filesystems using xfs_fsr
> /dev/PARTITION if their fragmentation is > 50% etc? Does
> anyone regularly defrag their production filesystems or
> just defrag their filesystems on a regular basis?
We have several hundred production filesystems defragmented
Even so I think that defragment-by-copy is a much better option.
mingz> [ ... ] we mainly handle large media files like 20-50GB.
mingz> [ ....] hope this does not hold true for a 15x750GB SATA
mingz> raid5. ;)
mingz> [ ... ] say XFS can make use of parallel storage by using
mingz> multiple allocation groups. but XFS need to be built over
mingz> one block device. so if i have 4 smaller raid, i have to
mingz> use LVM to glue them before i create XFS over it right?
Well, I'll just hint that I cannot find euphemisms suitable for
expressing what I think of this setup :-).
mingz> but then u said XFS over LVM or N MD is not good?
It was me saying that [euphemism alert!] I would not recommend a
setup like that without understanding very well the consequences.