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02-05-2008 05:21 PM

Filesystem Realities
 
Alex Howells:
> Anyone advising you to deploy
> XFS in a production environment without
> UPS on 'critical' data is a fool.

Who, me? Not like I haven't asked for 'em. Or advised that strawman
case.

I don't know about "fool," but sometimes even a fool gets lucky...I knew
squat about XFS, it was just the next thing to try when ext3 ate my
data...

> Just my two cents, of course, and lets get back on topic? :)

Sure but....may I piss on your two-cent epithet first?

I personally run XFS all day long *synced from an ext2 ramdisk* so hey,
double fool points for me...but I haven't lost 10min of work since...I'm
very familiar with 'sync' too, no problem flushing at your comfort
level.

If power crashes, my disk doesn't crash with it, just RAM. My main
issue is not having disks spinning when power fails. Basically my disks
almost never spin - swapoff, RAMdisk, nice tmpfs use.

A database is another thing. It has multiusers, transaction integrity,
throughput, yada yada. I'm not sure any fs is good 'nuf except ZFS.
But I would probably use RAID for dbs nowadays. The point is, if you
have a Biga-bytes database, design and tune, or *you will hurt no matter
which fs you're using.*

The file system wars blame the wrong targets...the real problems are the
legacy *nix holdovers like /var/logs and the sort of server mentality
that goes with them. I love Firefox, but have you ever looked at the
crazy insane backup behavior? It's unreal - they imitate server cron
jons. Pretty ugly performance hits. You maybe thought your bookmarks
were "private" but nooooo. They live in ten different places. And of
course "profile" management is a sore spot. Because in the legacy
server mentality, disks don't move around.

I fstablish craptastic legacy server stuff like /var/logs in tmpfs -
where no disks spin. A server *is* another story. They need disk logs;
but not desktops. I mean it's absurd. We have L1 cache, L2 cache, L3
cache, gigahertz and megabytes, which all goes to waste because *nix
wants to write /var/logs...the absolute worst single performance killer
being disk access. So yeah, forgive me if I'm too fond of RAM.

Even Linus himself finally woke up recently about atime option..."hey
guys, what a ridiculous self-defeating behavior!" or words to that
effect. It only took 15 years, too...

There is a lot of room for improvement in Linux...sort of at the "wow
that was dumb" level...

Well bye 'til beta time, then...
--

davecode@nospammail.net

--
http://www.fastmail.fm - Or how I learned to stop worrying and
love email again

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