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| mnaser | <logan->we're doing netboot ramdisk for stateless hypervisors. < that's quite badasss | 01:39 |
|---|---|---|
| mnaser | we could probably do the same honestly, considering we're using rbd only | 01:39 |
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| logan- | mnaser: thanks :D same re: rbd only (for now). i'm looking at building out a locally backed aggregate and its more debatable but still leaning towards stateless os | 04:21 |
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| peterjenkins_ | anyone using Ceph cache tiering? | 12:12 |
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| dmsimard | peterjenkins_: there was a discussion about it fairly recently: http://eavesdrop.openstack.org/irclogs/%23openstack-operators/%23openstack-operators.2016-11-03.log.html#t2016-11-03T11:52:44 | 14:12 |
| peterjenkins_ | Thanks! Very helpful | 14:17 |
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| openstackgerrit | Merged openstack/osops-tools-contrib: Lint the lampstack wordpress role https://review.openstack.org/394047 | 15:46 |
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| mnaser | "Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu N" type of friday | 17:51 |
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| mnaser | has anyone ever had a vm crash an entire compute node (kvm)? | 18:56 |
| mnaser | (consistently) | 18:56 |
| mnaser | it's a windows 2008 r2 vm | 18:56 |
| klindgren__ | consistently no | 18:57 |
| klindgren__ | HV's crash - yes | 18:57 |
| mnaser | klindgren__: we had a compute node crash, it rebooted and we found this in the logs - Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 6 | 18:57 |
| mnaser | a few hours later in the day, it happened again. we evacuated the compute node, a bit later another compute node crashes | 18:57 |
| mnaser | by luck i saw that the state of one of the VMs was "REBOOT", so i suspected it being the issue. when the compute node came back, that VM started up again, stopping it resulted in the HV crashing agian | 18:58 |
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| mnaser | we've locked out the vm to avoid making a bigger mess (nova lock <..>) but i am unsure where to go next :-( | 18:58 |
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| klindgren__ | so one thing in the past - unsure what CPU's you are dealing with | 19:00 |
| klindgren__ | but cstates would cause some system stability issues | 19:01 |
| mnaser | hmm | 19:02 |
| klindgren__ | where their were specific issues on nahelem cpu's that wouldn't correctly wake up from the lower cstates | 19:02 |
| klindgren__ | https://support.citrix.com/article/CTX127395 | 19:02 |
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| mnaser | i remember this mess back in the xenserver days :p | 19:03 |
| mnaser | (we started off with xenserver and moved to kvm) | 19:03 |
| klindgren__ | pretty sure it impacts both equally | 19:03 |
| klindgren__ | IE its a problem with the cpu - not the HV/OS. | 19:03 |
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| klindgren | thats the only thing I can think of. If you pay for support from your distro provider - you might be able to open a ticket with them on what causing the crash | 19:04 |
| klindgren | especially sicne you can esily repo it | 19:04 |
| klindgren | since* easily* | 19:04 |
| mnaser | klindgren: i have vmcore-dmesg and vmcore files which could probably help but we use centos | 19:05 |
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