Explore Your ZFS Adaptic Replacement Cache (ARC)


 
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Old 01-29-2009
Explore Your ZFS Adaptic Replacement Cache (ARC)

This blog explains output from the arc_summary tool, which is a kstat-based PERL application written by Ben Rockwood. The tool runs calculations and presents a report of ZFS ARC to help you interpret ARC data more appropriately. Also provides a link to the arc_summary tool.

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ARCMSR(4)						   BSD Kernel Interfaces Manual 						 ARCMSR(4)

NAME
arcmsr -- Areca SATA II RAID Controller driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device pci device scbus device da device arcmsr Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): arcmsr_load="YES" DESCRIPTION
The arcmsr driver provides support for the Areca ARC-11xx and ARC-12xx series of SATA II RAID controllers. These controllers feature RAID-0, 1, 3, 5, 6, and 10 and JBOD acceleration for up to 16 SATA drives. Raid level and stripe level migration, online capacity expansion, hot insertion/removal, automatic failover and rebuild, and SMART are also supported. Access to the arrays is provided via the SCSI CAM /dev/da? device nodes. A management interface is also present via the /dev/arcmsr? device node. Management tools for i386 and amd64 are available from Areca. HARDWARE
The arcmsr driver supports the following cards: o ARC-1110 o ARC-1120 o ARC-1130 o ARC-1160 o ARC-1170 o ARC-1180 o ARC-1110ML o ARC-1120ML o ARC-1130ML o ARC-1160ML o ARC-1210 o ARC-1220 o ARC-1230 o ARC-1260 o ARC-1280 o ARC-1210ML o ARC-1220ML o ARC-1231ML o ARC-1261ML o ARC-1280ML FILES
/dev/da? Array block device /dev/arcmsr? Management interface SEE ALSO
da(4), scbus(4) HISTORY
The arcmsr driver first appeared in FreeBSD 5.4. AUTHORS
The driver was written by Erich Chen <erich@areca.com.tw>. BUGS
The driver has been tested on i386 and amd64. It likely requires additional work to function on big-endian architectures. BSD
March 28, 2008 BSD