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Top Forums UNIX for Advanced & Expert Users Memory fragmentation in a Linux settop box Post 302908893 by Peasant on Friday 11th of July 2014 06:54:13 AM
Old 07-11-2014
I had ZFS ARC 'issues' on Oracle database machines (database using ASM).

Since there is alot of free memory, ZFS eats most of it. Then application start to attack the database causing significant rise of PGA.

Altho the ZFS holds alot of GB, it is slow to release, and the machine starts swapping causing everything to come to a almost halt.

I resolved by lowering ARC cache max to 4 GB on every database machine.
These are LDOMs on Solaris 11.1 T5 Sparc machines.

Regards
Peasant.
 

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zdb(8)							  System Administration Commands						    zdb(8)

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(8), zpool(8), attributes(5) SunOS 5.11 31 Oct 2005 zdb(8)
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