Re: Small files perform much faster on newly formatted fs?

Eric Sandeen
2011-06-08T21:16:33Z

On 6/8/11 3:52 PM, Eric Sandeen wrote:
> 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.

.... or that one or the other partition on your raid5 is not aligned?

-Eric

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