Paul Barker wrote:
... reads are fast with little overhead. ... I'm not worried about the high write times as the volumes I have on the array are mainly read.

I am pretty much only going to use my arrays for reading too. I wonder if it would be advantageous to make them read-only.


Just curious if you got any output in dmesg

I don't know how to tell when the messages are displayed...I do see lots of (250ish) of :


APIC error on CPU0: 40(40)

but I don't know what that means.

or /var/log/messages whilst running.

Nothing at all in /var/log/messages

Did you (dare) try running this on the master and slave arrays at the same time ?

I just did this :

cd /mnt/md1/bonnie++/ ; /usr/sbin/bonnie++ -u mwaterman > & bonnie++-2.txt & ; cd /mnt/md2/bonnie++/ ; /usr/sbin/bonnie++ -u mwaterman > & bonnie++-2.txt &

and these are the results :

/dev/md1 - 4xWD800/8/XFS

      ------Sequential Output------ --Sequential Input- --Random-
      -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
 Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
   3G 21862  39 25205   7 11192   3 24639  42 40046   7 248.7   0
      ------Sequential Create------ --------Random Create--------
      -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
   16   729  13 +++++ +++   834  11   805  15 +++++ +++   557   8

/dev/md2 - 4xWD2000/8/XFS

      ------Sequential Output------ --Sequential Input- --Random-
      -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
 Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
   3G 21610  38 27858   8 11986   3 23943  40 36737   7 234.2   0
      ------Sequential Create------ --------Random Create--------
      -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
   16   606   8 +++++ +++   590   9   610  12 +++++ +++   503   7

I assume 'output' is 'write' and 'input' is 'read'? I'm not sure I really understand the numbers. Strange...

Previous results are below.

Thoughts?

Max.

Max Waterman wrote:
>
> /dev/md1 is 4xWD800 PATA RAID5 master array
> ===========================================
>       ------Sequential Output------ --Sequential Input- --Random-
>       -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
>  Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
>    3G 31272  59 34758   8  9009   3 16343  28 19788   3 265.3   1
>       ------Sequential Create------ --------Random Create--------
>       -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
> files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
>    16   506   8 +++++ +++   574   7   530  10 +++++ +++   367   5
>
> /dev/md2 is 4xWD2000 PATA RAID5 slave array
> ===========================================
>       ------Sequential Output------ --Sequential Input- --Random-
>       -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
>  Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
>    3G 44201  78 43174  11 14761   6 38522  67 66666  14 359.4   0
>       ------Sequential Create------ --------Random Create--------
>       -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
> files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
>    16  1098  14 +++++ +++  1131  16  1118  17 +++++ +++  1006  15
>
>
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