Which process is writing to disk?
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From: Rehceb Rotkiv on 10 Mar 2007 15:52 (and getting on my nerves with it.. ;) When my system is idle, my SATA hard disk makes a little noise quite exactly every 1st and 3rd second of every 5 seconds. "dstat" reveals that there is indeed a disk write every 5 seconds. Maybe the other noise at the 3rd second is from the moving back of the disk head after the write (?). Anyway, I want to find out the process that is causing the disk activity. Does anyone know of a monitoring tool for this purpose -- or can identify the noise-maker right away? I'm pretty sure it's a system process like pdflush that just needs a little tuning... Thx, Rehceb
From: Laszlo Lebrun on 11 Mar 2007 05:28 Rehceb Rotkiv wrote: > (and getting on my nerves with it.. ;) > > When my system is idle, my SATA hard disk makes a little noise quite > exactly every 1st and 3rd second of every 5 seconds. "dstat" reveals > that there is indeed a disk write every 5 seconds. Maybe the other > noise at the 3rd second is from the moving back of the disk head > after the write (?). It would help, if you mention, which file system you have been using. Probably a journalling one?
From: Rehceb Rotkiv on 11 Mar 2007 09:47 > It would help, if you mention, which file system you have been using. > Probably a journalling one? Yes, sorry, I'm using reiserfs with a 2.6.17 kernel.
From: Snowbat on 12 Mar 2007 12:24 On Sat, 10 Mar 2007 14:52:40 -0600, Rehceb Rotkiv wrote: > SATA > Anyway, I want to find out the process that is causing the disk > activity. Does anyone know of a monitoring tool for this purpose lsof /dev/sdXX I don't see a 'wait around for more input' option but there's always script (writing to a different partition): #!/bin/bash touch lsofdump1.txt while true do lsof /dev/sda7 > lsofdump2.txt diff lsofdump1.txt lsofdump2.txt mv lsofdump2.txt lsofdump1.txt done exit 0 -- -- Posted via a free Usenet account from http://www.teranews.com
From: Unruh on 12 Mar 2007 16:00
Snowbat <snowbat(a)geocities.com> writes: >On Sat, 10 Mar 2007 14:52:40 -0600, Rehceb Rotkiv wrote: >> SATA >> Anyway, I want to find out the process that is causing the disk >> activity. Does anyone know of a monitoring tool for this purpose >lsof /dev/sdXX >I don't see a 'wait around for more input' option but there's always >script (writing to a different partition): >#!/bin/bash >touch lsofdump1.txt >while true >do > lsof /dev/sda7 > lsofdump2.txt > diff lsofdump1.txt lsofdump2.txt > mv lsofdump2.txt lsofdump1.txt >done >exit 0 Or find /var -mtime -1 -ls and look at the mod time on the output of ls. This prints out all files in /var which have changed in the past day and prints out the time which willshow which changed in the past 5 min. It is probably a write. Note that this will not detect reads. Eg, you could have a program ( like postfix) which looks to see if mail has been stored on the disk for later delivery. |