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From "Malcolm Crossley (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-7527) XenServer heartbeat-script: make it reboot faster (when fencing)
Date Wed, 15 Oct 2014 13:48:34 GMT


Malcolm Crossley commented on CLOUDSTACK-7527:

Can you at least sync the disks before echoing "b" to /proc/sysrq-trigger

You can do this with a echo s > /proc/sysrq-trigger

Also if you want to capture some state of the host you could trigger a crash instead which
will run the Xenserver crashdump analyser.  This will result in kernel dmesg ring and Xen
dmesg ring being preserved. 

To trigger a crash: echo c > proc/sysrq-trigger

I would not trigger a crashdump by default because it won't be clear that Cloudstack initiated
the crash.

> XenServer heartbeat-script: make it reboot faster (when fencing)
> ----------------------------------------------------------------
>                 Key: CLOUDSTACK-7527
>                 URL:
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: XenServer
>    Affects Versions: 4.3.0, 4.4.0
>            Reporter: Remi Bergsma
>            Assignee: Daan Hoogland
>            Priority: Minor
> I've seen the 'reboot' command hang, even though it has the force option specified (last
line of the script). Wouldn't it be better to invoke it like this:
> echo b > /proc/sysrq-trigger
> Tested it, starts boot sequence immediately.

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