> On Wed, 2 Sep 2009 19:26:29 -0600, dan <danden...@gmail.com> wrote:
> > This is somewhat dependant on filesystem and IO Scheduler of the OS.
> > Some filesystems excel under IO loads (ZFS) but shrivel and die under
> RAM
> > pressure(ZFS)
>
> strange, was not really my experience...
> before i used backuppc, i used a hand made rsync script on
> a solaris with ZFS and during the backups the machine as dog
> slow and trying to use the ZFS filesystem took seconds
> and even minutes...but still had free ram (about 2GB)
>
> Earlier releases of ZFS did this. I had this same issue until I updated.
I cant remember version numbers but today's ZFS doesnt lock up like this.
Best explanation I found was a bug in the write buffer that used way too
much CPU and locked the process ZFS was using for periods of time. This
seems to have been solved.
> maybe because i had just 2 HDs and for several times i
> manage to fill 100% the ZFS (i found that with 0 bytes
> free, you cant delete anything, just a echo > big_file
> would help there). it was still too new and buggy for sure,
> and i probably stressed too much that poor XFS :)
>
> I also had this issue with ZFS. The solution was to make a small volume
that you could destroy if other volumes got to full. This is a stupid bug
for sure.
> i gave up that ZFS and script after a powerlost and the ZFS
> didnt come online no matter what i did... after 2 days of
> unsuccessful tries, i installed backuppc.
>
> ZFS is a monster and there were a lot of bugs in earlier versions. It has
started to mellow out quite a bit. I wouldnt write it off just yet BUT I am
more interested in the upcoming btrfs. It is a lot simpler code and already
has more people contributing.
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