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Date:      Thu, 16 Aug 2012 16:02:16 -0500
From:      Paul Schmehl <>
Cc:        Steve O'Hara-Smith <>
Subject:   Re: Best file system for a busy webserver
Message-ID:  <46848553A57E8518AD9DCCEB@localhost>
In-Reply-To: <>
References:  <47AFB706686083E99B3A3F3E@localhost> <> <175D3B4E21331C5682EE2148@localhost> <>

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--On August 16, 2012 9:42:30 PM +0100 Steve O'Hara-Smith <> 

>> I don't even know where to begin.  There's about 15G of data on the
>> server.
> 	OK I would say there's no pressing reason to consider ZFS for this
> purpose. You'd save a bit of time in crash recovery with no fsck going on,
> and perhaps the checksum mechanism would give some peace of mind - but
> really in 15GB silent corruption is a very slow process - now if it were
> 15TB ...


>> last pid: 40369;  load averages:  0.01,  0.03,  0.00
>> up 104+09:33:44 13:14:49
>> 137 processes: 1 running, 136 sleeping
>> CPU:  0.7% user,  0.0% nice,  0.1% system,  0.0% interrupt, 99.2% idle
>> Mem: 229M Active, 6108M Inact, 1056M Wired, 15M Cache, 828M Buf, 514M
>> Free Swap: 16G Total, 28K Used, 16G Free
> 	OTOH you have plenty of memory lying around doing nothing much
> (6108M inactive) so you can easily support ZFS if you want to play with
> it's features (the smooth integration of volume management and filesystem
> is rather cool).

It's hard, nowadays, to buy a server that's too small for our needs.  Most 
of them are way overspec'd for what this server does.  Which is a nice 
luxury to have.
> 	It sounds like you have backups or at least some means of restoring
> the site in the event of disaster so that's all good.

Yes, daily, and the servers are always configured in RAID1.

> If there was a
> pressing need to be able to get back up fairly quickly and easily I'd be
> suggesting ZFS in RAID1 with a hot swap bay in which a third disc goes,
> attached as a third mirror, periodically split it off the mirror take
> it off site, and replace it with the one that's been off site.
> 	There's really nothing here that's pushing you in any particular
> direction for a filesystem, at 15GB if performance ever becomes a problem
> a RAID1 of SSDs with UFS would make it fly probably into the hundreds of
> hits per second range.

Thanks for the input, Steve.  I appreciate it.

Paul Schmehl, Senior Infosec Analyst
As if it wasn't already obvious, my opinions
are my own and not those of my employer.
"It is as useless to argue with those who have
renounced the use of reason as to administer
medication to the dead." Thomas Jefferson
"There are some ideas so wrong that only a very
intelligent person could believe in them." George Orwell

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