Patrick Bervoets
2015-Jan-30 20:32 UTC
[CentOS] C6 server responding extremely slow on ssh interactive
Op 30-01-15 om 19:40 schreef Gordon Messmer:> On 01/30/2015 01:21 AM, Patrick Bervoets wrote: >> iostat random sample > > "Random" is difficult to evaluate. Is that representative? Are sda, sdb, and sdc typically less than 1% utilized? Or are there large utilization values right after a hang?All the output was in the same scale and during a hang in an other shell.> > > Does the time displayed by "atop" eventually catch up?Not that I know. But I gave up :-)> > Does the problem persist across reboots?Alas, one of the vm's is our production database. My next update/reboot window is next saturday. But I had the problem just before the last reboot (halfway january). But hadn't closely monitored it afterwards. Before - in december - I never experienced it. But it's a server I tend do leave alone, so I'm never very busy on a shell.> > Is this system running ntpd?yes> > Does the problem persist if you turn ntpd off and reboot? > _I'll check that next week.
Gordon Messmer
2015-Jan-30 20:51 UTC
[CentOS] C6 server responding extremely slow on ssh interactive
On 01/30/2015 12:32 PM, Patrick Bervoets wrote:> Before - in december - I never experienced it. But it's a server I tend > do leave alone, so I'm never very busy on a shell.Do you know what kernel you were running at the time? It might be useful to see if reverting to that revision changes the symptoms.
Patrick Bervoets
2015-Jan-30 21:40 UTC
[CentOS] C6 server responding extremely slow on ssh interactive
Op 30-01-15 om 21:51 schreef Gordon Messmer:> On 01/30/2015 12:32 PM, Patrick Bervoets wrote: >> Before - in december - I never experienced it. But it's a server I tend >> do leave alone, so I'm never very busy on a shell. > > Do you know what kernel you were running at the time? It might be useful to see if reverting to that revision changes the symptoms. >IIRC before the problem: kernel.x86_64 0:2.6.32-504.el6 problem occured during kernel.x86_64 0:2.6.32-504.1.3.el6 actual kernel.x86_64 0:2.6.32-504.3.3.el6 But since there is already a new kernel waiting; I'm not sure what to do. I think I'll first upgrade & test. If my maintenance window permits I'll test downgrading (but 3 updates...) BTW I've got 3 other kvm-servers without this behavior (but they are completely different machines so not much to compare)
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