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Re: [Patch][RFC] Support "xm dump" (is Re: [Xen-devel] Re: [Patch] Enabl

To: Tristan Gingold <Tristan.Gingold@xxxxxxxx>, John Levon <levon@xxxxxxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Patch][RFC] Support "xm dump" (is Re: [Xen-devel] Re: [Patch] Enable "sysrq c" handler for domU coredump)
From: Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>
Date: Thu, 03 Aug 2006 21:57:02 +0900
Cc: Muli Ben-Yehuda <muli@xxxxxxxxxx>, Horms <horms@xxxxxxxxxxxx>, Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kouya Shimura <kouya@xxxxxxxxxxxxxx>
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Hi, all

>>   For example panic dump option is used when domU kernel is hungup,
>>   and we want to reboot and make coredump atomatically.
>I'd prefer 'xm crash' (or 'xm panic') and 'xm dump' .
>I'd prefer 'xm dump' *not* to panic by default.  It is too dangerous.
OK. I also think both are necessary.
How about the following specification?

1. xm crash
   This is only for crashing a domain.
   If enable-dump is yes, we can get the domain's core after crash.
   And If we want to atomatically reboot, we should set on_crash='restart'
   in domain configuration.
2. xm dump
   This is for live dumping a domain.
   This implementation is:
     1. pause the domain
     2. dumping the domain
     3. unpause the domain
     4. reboot (if --noreboot option, don't reboot)
     I think we want to reboot when we want to dump.
     So I want to be default reboot.
   BTW, I think the feature to online-dump domain and 
   hypervisor is also necessary.(meaning online is "don't pause")
Best Regards,

Akio Takebe

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