RAID5 how chage chunck size from 64 to 128, 256 ? is it possible ?

RAID5 how chage chunck size from 64 to 128, 256 ? is it possible ?

[Andreas-Sokov]

Hi linux-raid.

RAID5 how chage chunck size from 64 to 128, 256 ?
is it possible ?
Somebody did this ?

-- 
Best regards,
Andreas-Sokov

Re: RAID5 how chage chunck size from 64 to 128, 256 ? is it possible ?

[Justin Piszcz]

When you reate the array its --chunk or -c -- I found 256 KiB to 1024 KiB 
to be optimal.

Justin.

On Sat, 9 Feb 2008, Andreas-Sokov wrote:

> Hi linux-raid.
>
> RAID5 how chage chunck size from 64 to 128, 256 ?
> is it possible ?
> Somebody did this ?
>
> --
> Best regards,
> Andreas-Sokov
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

Re: RAID5 how chage chunck size from 64 to 128, 256 ? is it possible ?

[Janek Kozicki]

Justin Piszcz said:     (by the date of Sat, 9 Feb 2008 04:14:51 -0500 (EST))

> When you reate the array its --chunk or -c -- I found 256 KiB to 1024 KiB 
> to be optimal.

Hello Justin,

what is your typical bonnie++ invocation, to test your configuration?
Which fields are meaningful for you from this benchmark?

Do you use anything else for benchmarks? 
eg: 'zcav /dev/sda > result' ?


I'm asking becuase I want to make some local benchmarks to determine
best chunk size in my HDD setup.

thanks in advance
-- 
Janek Kozicki                                                         |

Re: RAID5 how chage chunck size from 64 to 128, 256 ? is it possible ?

[Justin Piszcz]

On Sat, 9 Feb 2008, Janek Kozicki wrote:

> Justin Piszcz said:     (by the date of Sat, 9 Feb 2008 04:14:51 -0500 (EST))
>
>> When you reate the array its --chunk or -c -- I found 256 KiB to 1024 KiB
>> to be optimal.
>
> Hello Justin,
>
> what is your typical bonnie++ invocation, to test your configuration?
> Which fields are meaningful for you from this benchmark?
>
> Do you use anything else for benchmarks?
> eg: 'zcav /dev/sda > result' ?
>
>
> I'm asking becuase I want to make some local benchmarks to determine
> best chunk size in my HDD setup.
>
> thanks in advance
> --
> Janek Kozicki                                                         |
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

I use the following (3-iterations & average them):

   /usr/bin/time /usr/sbin/bonnie++ -d /x/test -s 16384 -m p34 -n 
16:100000:16:64 > $HOME/test"$i".txt 2>&1

I also use realistic testing as well such as untarring large files (> 
1GiB) etc..

Justin.