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*SOLVED* sync in VE context [message #13028]

Thu, 17 May 2007 20:23

rickb
Messages: 368
Registered: October 2006

Senior Member

Hello openvz gurus,

I do not think this has been asked before. What happens when sync is run from inside a VE context? are the fs buffers specific to the ve context updated to the disk or the entire server's buffers?

Rick

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[Updated on: Mon, 21 May 2007 06:25] by Moderator

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Re: sync in VE context [message #13042 is a reply to message #13028]

Fri, 18 May 2007 07:25

Vasily Tarasov
Messages: 1345
Registered: January 2006

Senior Member

Hello Rick,

entire server's buffers are synced.

Vasily.

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Re: sync in VE context [message #13070 is a reply to message #13042]

Fri, 18 May 2007 12:40

rickb
Messages: 368
Registered: October 2006

Senior Member

Vasily, thanks for the clarification. Is this by design?

I feel sync in the VE context should not flush the HNs entire disk buffers to disk, as the VE is making a decision it should not be involved in. I feel under a specific scenario, a resource dos attack could result in a ve continually calling sync.

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Common Terms I post with: http://wiki.openvz.org/Category:Definitions

UBC. Learn it, love it, live it: http://wiki.openvz.org/Proc/user_beancounters

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Re: sync in VE context [message #13074 is a reply to message #13070]

Fri, 18 May 2007 13:48

Vasily Tarasov
Messages: 1345
Registered: January 2006

Senior Member

It is a big deal to create safe per-VE syncing. But don't be afraid DOS attack: since 2.6.28-028test023 kernel we have ioprio feature, that grants all VE equal time to work with disk drives.

Vasily.

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