Date: Sun, 11 May 2008 09:47:00 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: Svein Skogen <svein-listmail@d80.iso100.no> Cc: freebsd-bugs@FreeBSD.org, freebsd-current <freebsd-current@freebsd.org>, pjd@FreeBSD.org Subject: Re: Question regarding mmap on ZFS, or possibly Dovecot Message-ID: <4826A474.7050904@FreeBSD.org> In-Reply-To: <482544DB.2000401@d80.iso100.no> References: <482544DB.2000401@d80.iso100.no>
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Svein Skogen wrote: > I still get massive file corruption when allowing Dovecot to run win > mmap enabled on ZFS/FreeBSD RELENG_7 (as of one week ago), and I have > seen symptoms of corruption with Samba and mmap on ZFS (although I > cannot say with certainty that those samba files were corrupted in the > FreeBSD end, they may have been mangled by my less-than-trustworthy > windows). > > For dovecot+mmap+zfs I get a googlefull of results, same with > samba+mmap+zfs. > > The question remains the same, however. Is this a problem with > samba/dovecot using mmap incorrectly, a problem with ZFS as such, or a > problem with the FreeBSD implementation of ZFS? I'm not asking this to > have someone to point fingers at, but because I want to do some > risk-reducing activities. If the problem is in the applications, > disabling mmap in those applications will be a workaround. If the > problem is with ZFS itself, or with FreeBSD, things start to get > interesting (it would need some global switch to turn mmap off, and I'm > not sure such a thing is practical/possible). I think it's a known but outstanding bug in ZFS + mmap. Kris
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