Date: Thu, 28 Apr 2011 16:46:30 +0000 From: Malcolm Waltz <mwaltz@PACIFIC.EDU> To: Daniel O'Connor <doconnor@gsoft.com.au> Cc: freebsd-stable List <freebsd-stable@freebsd.org> Subject: Re: ZFS vs OSX Time Machine Message-ID: <F203966E-E95F-4762-B1EB-908B2667ABC6@pacific.edu> In-Reply-To: <537A8F4F-A302-40F9-92DF-403388D99B4B@gsoft.com.au> References: <537A8F4F-A302-40F9-92DF-403388D99B4B@gsoft.com.au>
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I doubt the issues you are encountering have much to do with ZFS. It sounds like you are using TimeMachine over NFS. Obviously, Apple does not support that configuration: http://www.google.com/search?q=time+machine+nfs+site:apple.com In my opinion, TimeMachine should only be used with block storage. If you use any kind of file-sharing protocol (AFP, SMB/CIFS or NFS), TimeMachine is implemented using a sparse disk image broken into hundreds or thousands of separate files. This is a hack at best. Time machine works very well with locally attached storage, but if you need to use network storage, you might want to try iSCSI: http://thegreyblog.blogspot.com/2010/02/using-zfs-with-apple-time-machine.html http://people.freebsd.org/~rse/iscsi/iscsi.txt On Apr 28, 2011, at 7:03 AM, Daniel O'Connor wrote: > Does anyone else use ZFS to store TM backups? > > I find that whenever my laptop (over wifi!) starts a TM the ZFS machine it's backing up to grinds to a halt.. Other systems streaming stuff over NFS from it also tend to stall.. > > I presume that TM is doing something which causes ZFS some issues but I'm not sure how to find out what the real problem is let alone how to fix it.. > > I am running FreeBSD midget.dons.net.au 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #8 r217094M: Sat Jan 8 11:15:07 CST 2011 darius@midget.dons.net.au:/usr/obj/usr/src/sys/MIDGET amd64 > > It is a 5 disk RAIDZ1 with 1.29Tb free using WD10EADS drives. > > I don't see any SMART errors or ZFS warnings. > > I have the following ZFS related tunables > > vfs.zfs.arc_max="3072M" > vfs.zfs.prefetch_disable="1" > vfs.zfs.txg.timeout=5 > vfs.zfs.cache_flush_disable=1 > > Any help appreciated, thanks :) > > -- > Daniel O'Connor software and network engineer > for Genesis Software - http://www.gsoft.com.au > "The nice thing about standards is that there > are so many of them to choose from." > -- Andrew Tanenbaum > GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C > > > > > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"help
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