XFS: RevServer, web hosts, and you

Richmond richmondmathewson at gmail.com
Tue Jan 22 16:19:18 EST 2013

On 01/22/2013 11:09 PM, Andre Garzia wrote:
> Richmond,
> 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
> stuff.
> 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.

Thanks for answering that fairly comprehensively.

> 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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