Date: Fri, 17 Aug 2007 13:03:06 -0700 (PDT) From: "N. Harrington" <drumslayer2@yahoo.com> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: freebsd-fs@freebsd.org Subject: Re: Gjournal reporting 1/2 the speed of non journaled? What is the status of Gjournal? Message-ID: <236419.62551.qm@web34506.mail.mud.yahoo.com> In-Reply-To: <20070817154139.GA1089@garage.freebsd.pl>
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--- Pawel Jakub Dawidek <pjd@FreeBSD.org> wrote: > On Thu, Aug 16, 2007 at 06:02:09PM -0700, N. > Harrington wrote: > > With ZFS, I have not seen much new going on with > > gjournal. I am curious what the status of gjournal > and > > if it will likely be included with 6.3 (whenever > that > > is due) > > That was the plan, but I'm not yet sure if I'll find > time to do it. I hope so. It seems like everything is there. > > Also, as of late, I have been using it with > > 6.2-STABLE via the patches and I seem to be > getting > > 1/2 the transfer speeds compared to non journaled > > disks. It seems like this is recent as previous > tests > > showed it as quite fast. > > > > Any suggestions on why this could be happening > > greatly appreciated. > > > > tested via > > dd if=/dev/zero of=./testfile bs=16 count=16384 > > Gjournal is ~two times faster than UFS+SU for many > small, random and > parallel writes (such as running few 'tar x' > processes), but is two > times slower than UFS+SU for one sequential write > stream, as there is no > much that can be optimized there. Is there a test that I could try? I would swear that using the same test in the past, it showed as faster. > > With disks getting larger and larger, why is it > > taking so long for a journaled filesystem to be > > standard on BSD? > > We have ZFS now, we don't need journaled file > system:) I guess I need to learn now about ZFS. As far as I know it is not available in 6 yet and it is for raid, not for journaling or a filesystem itself. It would seem silly to have to resort to using zfs just so I can have a disk/mount that won't not require days to fsck (9 times out of 10) if there should be a problem. gjournaling has been the only thing that has kept FreeBSD used at my company for file storage. I have many many active TB's with it. Much of it in 500G slices, which I was thinking of increasing to 1TB slices. I could never do that with UFS with any sanity or hope of having a job after the day long fsck. I certainly could never justify why we should not switch to Linux to prevent it otherwise. I am so grateful you did gjournaling. If I thought we could afford it, we would pay to make sure its included in 6.3. Nicole > -- > Pawel Jakub Dawidek > http://www.wheel.pl > pjd@FreeBSD.org > http://www.FreeBSD.org > FreeBSD committer Am I Evil? > Yes, I Am! >
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