Re: xfs performance problem

Benjamin Schindler
2011-04-27T08:04:41Z

Hi

On 04/27/2011 09:55 AM, Michael Weissenbacher wrote:
> schrieb Stan Hoeppner:
>> Benjamin Schindler put forth on 4/26/2011 2:44 PM:
>>> Hi
>> Also, slap yourself in the forehead at least 3 times for running your
>> root filesystem on RAID 0. That's akin to riding a motorcycle, naked,
>> in a blizzard, down a steep, winding, ice covered mountain road with no
>> guard rails and a 3000 ft drop. ;)
>>
> If you are really adventurous and don't care about the data on your root
> fs use the following mount options:
> logbsize=256k,delaylog,nobarrier
>
> Personally i would only enable "nobarrier" on Server-Class hardware with
> Battery Backup and proper UPS. But since you are using RAID-0 i suppose
> you really don't care that much about the data on your root fs.

Or stop using raid-0 all together. The performance gain is more than
offset by the barriers and it seems using xfs on just a single disk
would improve performance a lot more than using raid-0 (with disk
failure risk) + risk of corruption due to disabled barriers... or am I
missing something?

>
> Note that both logbsize and delaylog will only have effect on your root
> fs if added to grub.conf (real_rootflags=) since remounting won't
> activate them. Use "cat /proc/mounts" to see if these options were
> really enabled.
>
> hth,
> Michael
>
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