sanjay nadkarni (Laptop) wrote:
> Mike Gerdts wrote:
>
>> On Wed, Jul 2, 2008 at 10:08 AM, David Magda <[EMAIL PROTECTED]> wrote:
>>
>>
>>> Quite often swap and dump are the same device, at least in the
>>> installs that I've worked with, and I think the default for Solaris
>>> is that if dump is not explicitly specified it defaults to swap, yes?
>>> Is there any reason why they should be separate?
>>>
>>>
>> Aside from what Kyle just said...
>>
>> If they are separate you can avoid doing savecore if you are never
>> going to read it. For most people, my guess is that savecore just
>> means that they cause a bunch of thrashing during boot (swap/dump is
>> typically on same spindles as /var/crashh), waste some space in
>> /var/crash, and never look at the crash dump. If you come across a
>> time where you actually do want to look at it, you can manually run
>> savecore at some time in the future.
>>
>> Also, last time I looked (and I've not seen anything to suggest it is
>> fixed) proper dependencies do not exist to prevent paging activity
>> after boot from trashing the crash dump in a shared swap+dump device -
>> even when savecore is enabled. It is only by luck that you get
>> anything out of it. Arguably this should be fixed by proper SMF
>> dependencies.
>>
>>
> Really ? Back when I looked at it, dumps were written to the back end of
> the swap device. This would prevent paging from writing on top of a
> valid dump. Furthermore when the system is coming up, savecore was
> run very early to grab core so that paging would not trash the core.
>
>
I'm guessing Mike is suggesting that making the swap device available
for paging should be dependent on savecore having already completed it's
job.
-Kyle
> -Sanjay
>
>
>> --
>> Mike Gerdts
>> http://mgerdts.blogspot.com/
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>>
>
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