CentOS docs - Jan 2009 - wiki page edit request HowTos/Disk_Optimization

Hi, I have gone thought he painful operation of registering just to edit
one page then I found out i have to also get on this mailing list to get
permission... Why can't the wiki page display that I have no permission
to edit? and also why can't edits be sent to a moderation queue for
approval? Anyways this is my request to edit
http://wiki.centos.org/HowTos/Disk_Optimization page as it has a obvious
error.

I recently became aware of a error on the
http://wiki.centos.org/HowTos/Disk_Optimization page. The stride is
calculated for the one spindle not the group. For that example it is 64K
/ 4K = a stride of 16, also the stride width is not the 4 disks in raid
5 as one is the checksum so it's 3 * stride = width 48, so the command
would be mkfs.ext3 -b 4096 -E stride=16 -E stripe-width=48 -O dir_index
/dev/XXXX

If you would like to see some creditability as to what I can do see
http://crux.nu my alias is Romster i am a contrib maintainer, I
contribute time to #winehq and #lvm I am also working on my own distro
flavor http://shortcircuit.net.au/~romster/hvl.xhtml

Kind regards,
Danny Rawlins

Danny Rawlins wrote:
> Hi, I have gone thought he painful operation of registering just to edit
> one page then I found out i have to also get on this mailing list to get
> permission... Why can't the wiki page display that I have no permission
> to edit? and also why can't edits be sent to a moderation queue for
> approval? 
Something like this is in the works. Problem with a completely open wiki
ist, that we don't have enough people to monitor everything and delete
spam in a timely fashion. Sorry for the inconvenience.
> Anyways this is my request to edit
> http://wiki.centos.org/HowTos/Disk_Optimization page as it has a obvious
> error.
Your Wiki account is DannyRawlins?

Cheers,

Ralph
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
Url :
http://lists.centos.org/pipermail/centos-docs/attachments/20090105/4ab7e08a/attachment.bin

Ralph Angenendt wrote:
> Danny Rawlins wrote:
>   
>> Hi, I have gone thought he painful operation of registering just to
edit
>> one page then I found out i have to also get on this mailing list to
get
>> permission... Why can't the wiki page display that I have no
permission
>> to edit? and also why can't edits be sent to a moderation queue for
>> approval? 
>>     
>
> Something like this is in the works. Problem with a completely open wiki
> ist, that we don't have enough people to monitor everything and delete
> spam in a timely fashion. Sorry for the inconvenience.
>   
Thats OK I was a little confused about it all until I read the
contribute page.
>   
>> Anyways this is my request to edit
>> http://wiki.centos.org/HowTos/Disk_Optimization page as it has a
obvious
>> error.
>>     
>
> Your Wiki account is DannyRawlins?
>   
Ah I forgot to include that, and yes that's me thank you I go and edit
that page shortly. the 'Romster' alias is my IRC nickname (on freenode
of course) maybe I should of been more clear, sorry about
that.
> Cheers,
>
> Ralph
>   
> I sometimes think I spread myself to thin between projects but I like to
pitch in where I can to help others, and I know what it's like to be under
staffed.
>   
Regards,
Danny Rawlins
<Romster>

Not to nitpick toooo much, I had the opportunity to play follow along
with this page and it is still needs help:
"You divide the chunk size by the block size..." BUT then has
"(chunk
size * block size)". The "*" should be "/".

The example for RAID 5 is fine, but the RAID 10 example sentence may be
better after the code example as to not confuse a reader for which of
the 2 options the code is for.

The mkfs.ext3 command exampled is not supported in CentOS 4 or 5 . The
"-E stripe-width=48" is not allowed according the "man
mkfs.ext3".

If examples of performance improvements could be added like:

#sync ; time dd if=/dev/sdc1 of=/dev/null bs=1M count=20480

(default mkfs.ext)
221474836480 bytes (21 GB) copied, 126.272 seconds, 170 MB/s
real    2m6.275s

(stride tweak only)
21474836480 bytes (21 GB) copied, 107.209 seconds, 200 MB/s
real    1m47.212s

Not to nitpick toooo much, I had the opportunity to play follow along
with this page and it is still needs help:
"You divide the chunk size by the block size..." BUT then has
"(chunk
size * block size)". The "*" should be "/".

The example for RAID 5 is fine, but the RAID 10 example sentence may be
better after the code example as to not confuse a reader for which of
the 2 options the code is for.

The mkfs.ext3 command exampled is not supported in CentOS 4 or 5 . The
"-E stripe-width=48" is not allowed according the "man
mkfs.ext3".

If examples of performance improvements could be added like:

#sync ; time dd if=/dev/sdc1 of=/dev/null bs=1M count=20480

(default mkfs.ext)
221474836480 bytes (21 GB) copied, 126.272 seconds, 170 MB/s
real    2m6.275s

(stride tweak only)
21474836480 bytes (21 GB) copied, 107.209 seconds, 200 MB/s
real    1m47.212s


pjwelsh