Small files perform much faster on newly formatted fs?

[Eric Sandeen]

On 6/8/11 7:26 AM, Norbert Veber wrote:
> On Wed, Jun 08, 2011 at 09:11:10AM +0200, Michael Monnerie wrote:
>> On Dienstag, 7. Juni 2011 Norbert Veber wrote:
>>> 20 seconds vs 3+ minutes?!  The only difference I can see is
>>> lazy-count=1 and a larger agcount.  Sunit and swidth were also set
>>> automatically by mkfs this time.
>>
>> Then retry mounting the old fs with sunit= and swidth= parameters. Are 
>> they on the same disks? What are your disks (number, kind)?
> 
> Yes its already mounted this way as I mentioned in my original message:
> /dev/mapper/vg0-shared on /shared type xfs (rw,noatime,sunit=128,swidth=256)
> 
> Both filesystems are on the same MD raid 5 which consists of 3 1 tb WD
> Black hard drive.

The 2 filesystems are at different locations on the disks, so that will make
some difference.

It's probably also possible that your old log is not stripe-aligned.

Not sure what else it might be ...  You did get the units right on your
stripe specification at mount-time, good job! ;)

-Eric


> Thanks,
> 
> Norbert
> 
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