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IDS Forum

Re: Problems on SUN with chunks being marked down

Posted By: Keith Simmons
Date: Friday, 15 August 2008, at 6:23 a.m.

In Response To: Re: Problems on SUN with chunks being marked down (ALYX CHAVIS)

2008/8/14 ALYX CHAVIS <alyx_chavis@circuitcity.com>:
> It's not a permission's issue and a reboot was not involved either time. That
> was the very first thing I checked anyway just in case. :-(
>
> The disk showed no errors, no waits, no queue lengths, nothing!
>
> Thanks,Alyx
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
Alyx

Just some lateral random thoughts that might help.
As you have several instances on the same box it might be worth
tracking each (and every) dbspace through its chunks to the file
system links (if you use them) and down to the raw disk and the LUN
mappings just to ensure you havn't got any crossed links or are trying
to use the same disk space in more than one instance and that all disk
space sizes are consistant 'up the tree'.
I have done this myself on AIX but with different results !! :-((
I don't see how informix can write beyond the end of a LUN. When a
chunk is created infomrix checks the space is available and writable,
if the LUN has been created at a certain size it will present that
size to the O/S and should not allow writing outside that area (unless
there is something very wrong with the SAN software !!).
The disk speed question makes possible sense. I don't know the check
informix undertakes as it starts, but f it expects all chunks to
respond in a similar time-frame, and one or two are a bit slow (due to
slow disk) I could see how they could be marked as down. As rootdbs
would be the first accessed (and possibly set a standard for all other
responses) you could try putting that on the slowest disk to see if
that helps.

Keith

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