If it's consistently consuming a lot of CPU, doing a "ps auxwww" and checking for blocked state should do it.
On Mon, Jun 27, 2011 at 5:42 PM, Mike Ballon <mike.bal...@gmail.com> wrote: > you've mentioned iostat and vmstat so lets skip those. > > I would start sar and saving running process at the same interval, normal > 5mins. > > I would also take a look at lsof, tracing the pids > > Then there is iotop if you have it. > > -Mike > > On Monday, June 27, 2011, der.hans <pl...@lufthans.com> wrote: > > moin moin, > > > > I've got a machine experiencing a lot of IO wait. > > > > We had power at a datacenter go down last week. Since then IO wait has > > been over 35%. At first we thought it was due to 3ware RAID verify taking > > place due to the crash. That took a few days, then the weekly verify > > started. We stopped that and IO wait stayed high. 8 disks in a RAID 10. > > > > Load avg is also very high, presumably due to the IO wait. > > > > smartctl short tests didn't turn up any issues. > > > > We're not swapping at all. > > > > Disk read and write are fairly low. > > > > Network traffic is down as is the total number of process and the number > > of running processes. No evidence of network errors on the box or at the > > switch. > > > > Not much going on in the logs. We've stopped several reporting processes > > in order to reduce disk access. > > > > On the positive side, entropy has been staying high :). > > > > IO wait is not explicitly disk? It could be network, serial, USB, etc.? > > > > How do I determine what resource is causing the IO wait? Is there a way > to > > track to a specific process? > > > > vmstat, iostat, top and lots of other tools have been great at showing > > that there's overall IO wait ( I've been able to show that almost all > > processors have high wait, one was only at 5% ), but I haven't yet > > determined what and how. > > > > The server is running CentOS in case that matters. > > > > ciao, > > > > der.hans > > -- > > # http://www.LuftHans.com/ http://www.LuftHans.com/Classes/ > > # Hope has two beautiful daughters: Anger and Courage. Anger at the way > > # things are, and Courage to struggle to create things as they should > be. > > # -- St. Augustine > > --------------------------------------------------- > > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > > To subscribe, unsubscribe, or to change your mail settings: > > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > To subscribe, unsubscribe, or to change your mail settings: > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > -- James McPhee jmc...@gmail.com
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