Date: Sat, 10 May 2008 08:46:51 +0200 From: Svein Skogen <svein-listmail@d80.iso100.no> To: freebsd-bugs@FreeBSD.org, freebsd-current <freebsd-current@freebsd.org> Subject: Question regarding mmap on ZFS, or possibly Dovecot Message-ID: <482544DB.2000401@d80.iso100.no>
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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). The system running my ZFS is an Athlon64 running amd64 kernel, 4gb ram, and a raidZ of 3 500gb samsung disks (on an nForce430 chipset) //Svein
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