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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