gistfile1.txt

[15:18:55] Angelo RC: there are a command for showing what process uses most disk write?
[15:19:17] Rob Haswell: not that I know of, I'm afraid
[15:19:56] Rob Haswell: you can use "iostat" to see the current disk IO utilisation
[15:20:01] Angelo RC: yes
[15:20:06] Angelo RC: because i have two server
[15:20:09] Angelo RC: in one
[15:20:14] Angelo RC: root@rcs7 [~]# iostat -m
Linux 2.6.32-279.5.1.el6.x86_64 (rcs7.xdom.it) 	22/08/2012 	_x86_64_	(8 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           7,43    0,15    1,03   12,04    0,00   79,34

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sdb              94,78         0,01         3,49        932     218377
sda             113,94         3,28         0,49     205175      30335
md1               0,01         0,00         0,00          1          0
md2             149,86         0,29         0,49      17950      30331
[15:20:27] Angelo RC: and in other one
[15:20:28] Angelo RC: root@rcs8 [~]# iostat -m
Linux 2.6.32-220.23.1.el6.x86_64 (rcs8.xdom.it) 	22/08/2012 	_x86_64_	(8 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           7,76    0,08    1,44    7,18    0,00   83,54

Device:            tps    MB_read/s    MB_wrtn/s    MB_read    MB_wrtn
sdb              88,28         3,29         0,37   13640439    1545249
sda              85,67         3,27         0,37   13563807    1545316
md3              74,78         0,14         0,25     564461    1019926
md2              32,17         0,01         0,12      43529     501534
md1               0,00         0,00         0,00          1          0
[15:20:36] Angelo RC: if you see  MB_wrtn/s
[15:20:45] Angelo RC: i have 3,49 in one and 0,37 in other  oneù
[15:21:02] Angelo RC: but the server with 0,37 is with 100 account in plus
[15:21:09] Angelo RC: this is very strange
[15:22:37] Rob Haswell: it is strange
[15:22:47] Rob Haswell: I don't know how to go about determining that
[15:23:07] Rob Haswell: ordinarilly I would use dtrace but I would need to recompile your server's kernel with the dtrace module
[15:23:33] Rob Haswell: it's not something I can do without planning and co-ordination
[15:25:53] Angelo RC: thank you rob