Matthew Wakeling said,
>> If PFS is interrupted during a disk write, the old file will be used
>> after rebooting. The atomic update system means that the old file isn't
>> deleted, nor the directory pointers changed, until the new file is
>> completely written.
> If a file already exists, and you alter the middle of it, PFS2 does not do
> as you are suggesting. That would be terribly inefficient, and would
> lead to complete and utter fragmentation, unless you are very clever
> about it.
Ah, you're talking about modifying a file in-situ, as opposed to saving
out a new version? I'm not sure how that works with PFS.
> FFS distributes the disk meta-data over the disk far more than PFS3, and
> contains more redundant information.
True, it's also the reason for the massive difference in directory
handling speeds. Keeping the directory data in one place is a little
more susceptible to hardware errors, but it far faster and more
space-efficient.
> This means that if a portion of the
> disk gets blatted, you can cause a lot more damage to a PFS3 partition
> than you can a FFS partition.
Probably true, /if/ you manage to cause physical damage to the disk
while in use.
Neil
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