Date: Tue, 16 Nov 2010 13:23:40 -0600 From: Adam Vande More <amvandemore@gmail.com> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-questions@freebsd.org Subject: Re: Is ZFS ready for prime time? Message-ID: <AANLkTikFAQ0xsEOf=QybLhanO-w7wLEUz1W0pLv=zniU@mail.gmail.com> In-Reply-To: <ibu3fa$n07$1@dough.gmane.org> References: <AANLkTikCnCHF3wa257LejpHdW-%2BSH49_FgwmegwOFS2c@mail.gmail.com> <alpine.BSF.2.00.1011150927020.32766@tensor.gdynia.pl> <AANLkTimTzAoUO-9NqW6vcePU2CMUo-on0x=gOEaU%2BkZu@mail.gmail.com> <alpine.BSF.2.00.1011152032030.78383@tensor.gdynia.pl> <AANLkTi=Nrboc6M=pvhXhotrM%2BZeiG5_ghKnQrGArKL3U@mail.gmail.com> <84607C0F-183F-455A-B37A-B08030C01A9D@boosten.org> <AANLkTineuYhKttwp6ak5onQMJLea_cj8=E7tBj=4wZjN@mail.gmail.com> <ibu3fa$n07$1@dough.gmane.org>
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On Tue, Nov 16, 2010 at 8:11 AM, Ivan Voras <ivoras@freebsd.org> wrote: > Actually, I don't see anything incorrect in the above archive post. > I do. Cherry picking ZFS deficiencies without addressing the proper documented way to work around them or at even acknowledging it's possible to do so is FUD. It's not like traditional RAID doesn't have it's own set of gotcha's and proper usage environment. Dismissing the value of checksumming your data seems foolhardy to say the least. The place where silent data corruption most frequently occurs, in large archive type filesystems, also happens to be one of the prime usage candidates of RAIDZ. > > As for specific problems with ZFS, I'm also pessimistic right now - it's > enough to read the freebsd-fs @ freebsd.org and zfs-discuss @ > opensolaris.org lists to see that there are frequent problems and > outstanding issues. You can almost grep for people losing data on ZFS > weekly. Compare this to the volume of complaints about UFS in both OSes > (almost none). > There are actually very few stories of ZFS/zpool loss on the FreeBSD list(some are misidentifications of issues like this: http://lists.freebsd.org/pipermail/freebsd-fs/2010-September/009417.html), another source I would point you to is http://forums.freebsd.org/. The single recent valid one I can find involves a pool on geli, but I will grant you that it happens at all is quite disconcerting. There have been a lot of other ZFS issues ranging from performance, NFS troubles, quirks on storage controllers not present when using UFS, to other as-yet unexplained oddities. Many of these are corner cases, and I think they have mostly been resolved. If you've happened to encouter one, I'm sure it's left a sour taste though. UFS has it's own set of issues/limitations so regardless of what you pick make sure you're aware of them and take issues to address them before problems occur. -- Adam Vande More
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