Date: Sun, 02 Jan 2011 06:33:49 -0500 From: Dan Langille <dan@langille.org> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org, Peter Jeremy <peterjeremy@acm.org> Subject: Re: slow ZFS on FreeBSD 8.1 Message-ID: <4D20629D.2030803@langille.org> In-Reply-To: <20101231234747.GA8171@icarus.home.lan> References: <AANLkTinfYync_BG3zV028Or4ZgHe5iQ2tLVd1mn4a0r%2B@mail.gmail.com> <4D1AF388.3080107@infracaninophile.co.uk> <AANLkTim2oV3phJ4bTFL_ENNZYknm7Gjt_3uFdMd1UpYd@mail.gmail.com> <4D1B7431.7070808@infracaninophile.co.uk> <4D1BD8D0.5010402@langille.org> <4D1C4A2D.4020206@infracaninophile.co.uk> <4D1C7929.3040809@langille.org> <20101231233343.GB48579@server.vk2pj.dyndns.org> <20101231234747.GA8171@icarus.home.lan>
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On 12/31/2010 6:47 PM, Jeremy Chadwick wrote: > On Sat, Jan 01, 2011 at 10:33:43AM +1100, Peter Jeremy wrote: >> Based on my experiences at home, I converted my desktop at work to >> pure ZFS. The only issues I've run into have been programs that >> extensively use mmap(2) - which is a known issue with ZFS. > > Is your ZFS root filesystem associated with a pool that's mirrored or > using raidzX? What about mismatched /boot content (ZFS vs. UFS)? What > about booting into single-user mode? > > http://wiki.freebsd.org/ZFSOnRoot indirectly hints at these problems but > doesn't outright admit them (yet should), so I'm curious to know how > people have solved them. Remembering manual "one-offs" for a system > configured this way is not acceptable (read: highly prone to > error/mistake). Is it worth the risk? Most administrators don't have > the tolerance for stuff like that in the middle of a system upgrade or > what not; they should be able to follow exactly what's in the handbook, > to a tee. > > There's a link to www.dan.me.uk at the bottom of the above Wiki page > that outlines "the madness" that's required to configure the setup, all > of which has to be done by hand. I don't know many administrators who > are going to tolerate this when deploying numerous machines, especially > when compounded by the complexities mentioned above. This basically outlines the reason why I do not use ZFS on root. -- Dan Langille - http://langille.org/
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