>-----Original Message-----
>From: Daniel Berteaud [mailto:dani AT firewall-services DOT com]
>Sent: Friday, January 14, 2011 10:02 AM
>To: sorin.srbu AT orgfarm.uu DOT se; General list for user discussion,
>questions and support
>Subject: Re: [BackupPC-users] OT: New backup server with 6TB disk space
>
>Hi, here're my advices:
>
>- First, don't bother with GPT, just create a LVM PV on top of your RAID
>device, then, create a Volume Group, and one big Logical Volume. LVM is
>great for storage management, and I'd strongly encourage its usage for
>such a big hard drive.

How does the LVM do if I need it to be a raid0-array. Does it even care? 
Before I've always added partitions the "old-fashioned way" with 
fstab-entries, you "/dev/md0 /bak" etc.

>> Ext3 has so far with 1.5TB worked fine and had decent performance, if not a
>> speed demon. Xfs isn't supported yet I think in CentOS.
>
>AFAIK XFS is supported on CentOS 5.5 64bits (not on 32 bits)

Oh, that might explain some... I've only looked at 32b CentOS, as that is what 
the current BPC-server runs. Never bothered. Thanks for the heads-up!


>> Ext4 would maybe have been a good choice, but isn't
>> supported in CentOS either if I'm not mistaken.
>
>EXT4 is available as a technology preview in CentOS 5.5, and will be
>fully supported by redhat in rhel 5.6 (available since yesterday, CentOS
>5.6 should follow in about one month).

Yepp, RHEL 5.6 wasn't announced when I wrote that. 8-)


>I personally use ext3 most of the time for BackupPC, with some quite
>large partitions (bigger actually is 4To). It's working great, and is
>very reliable. But for your usage (lots of big files), you may take
>advantage of ext4 extent allocation, so, I'd go for ext4.

I'd say approx 25-30% are huge files, 50% really small files (approx 4-10kB 
each, and millions of them) and the rest in between. Would you still recommend 
ext4 then?

My main problem with ext3 is that deletion of whole folder-structures, with a 
million or so files and folders in them, takes forever to complete. Not that I 
do it very often, but when...

-- 
/Sorin

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