Re: [BackupPC-users] Filesystem?

I'm a big fan of zfs, but the compression won't be a factor since backuppc already compresses the data. My one backuppc box runs FreeBSD with the data on zfs and compression off.

I like managing storage with the zpool and zfs commands much better than md, lvm and ext4.

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-------- Original message --------
From: Sabuj Pattanayek <sabujp AT gmail DOT com>
Date: 12/02/2013 4:42 PM (GMT-06:00)
To: "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
Subject: Re: [BackupPC-users] Filesystem?

I've been doing some ZFS on linux vs XFS benchmarking and I'm seeing that ZFS is performing slightly better than XFS on reads and writes but sucks on deletes. If you're not going to be doing lots of deletes and need the ability to expand (e.g. thinking of using LVM) then ZFS may be a nice alternative to XFS+LVM . ZFS also has built in compression, and so far with my benchmarks (using lzjb) with it turned, random, sequential reads and writes are slightly slower than the vs without compression and still a few seconds faster than XFS (which has no compression).

On Mon, Dec 2, 2013 at 4:35 PM, Carl Cravens <ccravens AT excelii DOT com> wrote:

My experience troubleshooting I/O performance over iSCSI is that Ext4 journaling has a much higher CPU overhead than XFS does. Papers I've read show evidence that "modern" XFS journaling scales better (better performance) than Ext4 as disks grow larger. http://lwn.net/Articles/476263/

As a sysadmin, I like XFS management tools better than I do Ext4's.

On 12/02/2013 01:15 PM, Hans Kraus wrote:
> Am 02.12.2013 16:00, schrieb absolutely_free AT libero DOT it:
>> Hi,
>> I'm using BackupPC 3.2.1-4 (official Debian 7 package).
>> I'm going to configure an external storage (Coraid) in order to backup several
>> server (mostly Linux).
>> What kind of file system do you suggest?
>> Array is 7 TB large (raid6).
>> Thank you very much
>
> Hi,
> I've chosen Ext4, standig before the same problem some months ago. The
> reason behind this decision was that Ext4 seemed the best 'general
> purpose' FS. Maybe one of the developers can shed more light on this.
>
> Regards, Hans
>
>
>
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--
Carl D Cravens (ccravens AT excelii DOT com), Ext 228 (620.327.1228)
Lead System Architect

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