in solaris zfs cache many things, you should have more ram
if you setup 18gb swap , imho, ram should be high than 4gb
regards

Sent from my iPad

On Jun 25, 2012, at 5:58, tpc...@mklab.ph.rhul.ac.uk wrote:

>> 
>> 2012-06-14 19:11, tpc...@mklab.ph.rhul.ac.uk wrote:
>>>> 
>>>> In message <201206141413.q5eedvzq017...@mklab.ph.rhul.ac.uk>, 
>>>> tpc...@mklab.ph.r
>>>> hul.ac.uk writes:
>>>>> Memory: 2048M phys mem, 32M free mem, 16G total swap, 16G free swap
>>>> My WAG is that your "zpool history" is hanging due to lack of
>>>> RAM.
>>> 
>>> Interesting.  In the problem state the system is usually quite responsive, 
>>> eg. not memory trashing.  Under Linux which I'm more
>>> familiar with the 'used memory' = 'total memory - 'free memory', refers to 
>>> physical memory being used for data caching by
>>> the kernel which is still available for processes to allocate as needed 
>>> together with memory allocated to processes, as opposed to
>>> only physical memory already allocated and therefore really 'used'.  Does 
>>> this mean something different under Solaris ?
>> 
>> Well, it is roughly similar. In Solaris there is a general notion
> 
> [snipped]
> 
> Dear Jim,
>        Thanks for the detailed explanation of ZFS memory usage.  Special 
> thanks also to John D Groenveld for the initial suggestion of a lack of RAM
> problem.  Since up-ing the RAM from 2GB to 4GB the machine has sailed though 
> the last two Sunday mornings w/o problem.  I was interested to
> subsequently discover the Solaris command 'echo ::memstat | mdb -k' which 
> reveals just how much memory ZFS can use.
> 
> Best regards
> Tom.
> 
> --
> Tom Crane, Dept. Physics, Royal Holloway, University of London, Egham Hill,
> Egham, Surrey, TW20 0EX, England.
> Email:  T.Crane@rhul dot ac dot uk
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss@opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
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