> 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


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 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

Reply via email to