XFS: RevServer, web hosts, and you

Andre Garzia andre at andregarzia.com
Tue Jan 22 16:09:32 EST 2013


some features of ZFS (it has more features than this)

1. Checksums in Metadata for Data Integrity - meaning it can detect more
errors and has more integrity than EXT3 that uses block checksums.

2. Copy on write - means that writing to a file is a transaction, or it
happens correctly or it doesn't happen. It can't break because the old data
of the file is retained and can be rolled back if the checksums after
writing fail.

3. Data snapshots - You know that time machine thing that apple fakes using
incremental backups? Well ZFS has snapshots at file system level. You can
configure it to snapshot things every 15 minutes or every hour and you can
roll back time if you need.

4. ZFS has a pool - ZFS volumes are packed together in a zpool and you can
add or remove disks as needed to the pool. You're running short on disk
space? Just add another disk to the machine and add it to the pool, space
magically appears.

4.1 ZFS can create hybrid SSD/HD pools using the SSD as a high speed file
cache for often used stuff and the HD for long term storage.

5. Data scrubbing - ZFS can use the checksum to check all files in the
zpool and if you're using something like RAIDZ to mirror the data, it will
recover errors silently with no admin intervention between the mirrored

These are some basic features that everyone should have on their FS! At
this moment Solaris has the best ZFS support followed by FreeBSD. ZFS is
one of the things that Linux could really use.

On Tue, Jan 22, 2013 at 6:57 PM, Richmond <richmondmathewson at gmail.com>wrote:

> Here's a way naive comment, but:
> what is so special about ZFS compared with, say, EXT3?
> Richmond.
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