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Full Discussion: ZFS : Can arc size value exceed Physical RAM ?
Operating Systems Solaris ZFS : Can arc size value exceed Physical RAM ? Post 302713443 by DGPickett on Wednesday 10th of October 2012 04:59:57 PM
Old 10-10-2012
Before VM, free memory was gold, but in VM it is an accident of exiting programs. RAM may be unfreed but instantly available, mapped but unmodified relative to the backing disk. You need more RAM if you cannot tune the apps and data to run with what you have fast enough. VM apps with dynamic libs share RAM, for instance. A reduces variety of apps on a system releases memory. If the apps on a specific server work on a subset of all data, that reduces RAM churn.
 

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LEARN ABOUT OPENSOLARIS

zdb

zdb(1M) 						  System Administration Commands						   zdb(1M)

NAME

       zdb - ZFS debugger

SYNOPSIS

       zdb pool

DESCRIPTION

       The  zdb command is used by support engineers to diagnose failures and gather statistics. Since the ZFS file system is always consistent on
       disk and is self-repairing, zdb should only be run under the direction by a support engineer.

       If no arguments are specified, zdb, performs basic consistency checks on  the  pool  and  associated  datasets,	and  report  any  problems
       detected.

       Any options supported by this command are internal to Sun and subject to change at any time.

EXIT STATUS

       The following exit values are returned:

       0    The pool is consistent.

       1    An error was detected.

       2    Invalid command line options were specified.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWzfsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       zfs(1M), zpool(1M), attributes(5)

SunOS 5.11							    31 Oct 2005 							   zdb(1M)
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