10-16-2018
Quote:
Originally Posted by
javanoob
But how do I know if the amount of memory available and allocated to ZFS ARC is sufficient or not ?
Check the cache hit ratio to see how efficient it is. The closer to 100%, the better.
If you can fit all the files you use in RAM (hit rate 100%) and still have room enough for the applications and other consumers RAM usage, go for it and set the ZFS ARC size to be able to host everything.
On the opposite and more likely situation, that's a trade off and you should measure usage, do tests that last a few days or more, see how your RAM is used, see how performance is impacted by giving more memory to the cache or more memory to the applications, and act accordingly.
Last edited by jlliagre; 10-17-2018 at 04:18 AM..
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LEARN ABOUT DEBIAN
arcmsr
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