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  #1 (permalink)  
Old 10-28-2007, 06:53 PM
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Join Date: Oct 2007
Location: UK
Posts: 129
Default SysRq : Emergency Sync in kernel.log??

I found these in the log of my VPS (Debian Etch over xen):
---
Oct 27 05:27:10 www kernel: SysRq : Emergency Sync
Oct 27 05:27:10 www kernel: Emergency Sync complete
Oct 27 05:58:43 www kernel: SysRq : Emergency Sync
Oct 27 05:58:43 www kernel: Emergency Sync complete
Oct 27 05:59:39 www kernel: SysRq : Emergency Sync
Oct 27 05:59:39 www kernel: Emergency Sync complete
---
Can anyone shed some light on why these appeared? I am not running sysrqd, so it isn't that. As far as I know, one must be using the console to type the magic key sequences. Does my VPS have a console, and if so, who can use it, and to do what?

NB: The times are GMT+1 (British Summer Time).

Thanks,
Charles
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  #2 (permalink)  
Old 10-31-2007, 05:54 PM
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Join Date: Oct 2007
Location: UK
Posts: 129
Default more emergency syncs

It happened again, two nights running.

These times are GMT (we have 'fallen back')
---
Oct 30 04:00:04 www kernel: SysRq : Emergency Sync
Oct 30 04:00:04 www kernel: Emergency Sync complete
--- and
Oct 31 04:00:03 www kernel: SysRq : Emergency Sync
Oct 31 04:00:03 www kernel: Emergency Sync complete
---

VPSLink admins: do you know what is causing this? Or have a theory? I get very nervous when unexplained "emergency" messages show up in the log. The times imply that a scheduled task is provoking it, but I know of nothing in my system that would cause it.

As noted before, I am running over xen. Any other xen users seeing these messages? They are in kern.log.
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  #3 (permalink)  
Old 10-31-2007, 06:38 PM
Administrator
 
Join Date: Feb 2006
Posts: 773
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CBH,

We'll need a support ticket for this one so we can get onto the right node. I tried tracking down your account via your forum email, but I don't have a matching one in my billing DB.

Thanks!
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  #4 (permalink)  
Old 10-31-2007, 06:47 PM
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Join Date: Oct 2007
Location: UK
Posts: 129
Default

Done.

Yes, my forum email address is different from my account address. Messages from the forum are sent to me at my VPS. In the past, I learned the hard way that discussing a potentially broken system using an account on that system isn't a good idea.
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  #5 (permalink)  
Old 11-01-2007, 05:41 PM
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Join Date: Feb 2006
Posts: 773
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CBH,

Did you create a support ticket on this one? I checked a few times yesterday but didn't see it myself. This is an interesting issue and I want to make sure we get to the bottom of it. Thanks!
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Old 11-01-2007, 05:46 PM
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Join Date: Oct 2007
Location: UK
Posts: 129
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Yes, I did. Number 355705.

It happened again this morning.
---
Nov 1 04:00:04 www kernel: SysRq : Emergency Sync
Nov 1 04:00:04 www kernel: Emergency Sync complete
---

Thanks for checking it out!

Charles
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  #7 (permalink)  
Old 11-01-2007, 08:43 PM
Former Employee
 
Join Date: Feb 2006
Posts: 276
Default

What you're seeing is the result of a script that we run prior to initiating backups on your server. The script runs a sync to ensure that the data we backup is valid.
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  #8 (permalink)  
Old 11-02-2007, 12:05 AM
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Location: UK
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Backups are good.

Thanks for checking.
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