04-29-2011
Often, the bootstrap is on a simple disk, and the RAID is dedicated to the application. For software RAID, I wonder if that is a requirement, since you need to boot the software to get it together. Remember that raid5 is not churn-friendly or small-block-random efficient, so many shops put high-churn and small block-random data on mirrors, sometimes striped for more bandwidth. Also, the controller(s) can be a bottleneck. Even with lots of RAM, random operations on large data sets will fill RAM uselessly, and fsync() of RDBMS Commit and other critical files (postfix email) waits for magnetic completion. A shot of SSD might be a great complement. Sometimes, you can shadow the SSD with RAID5 hierarchically, so only the most accessed bits move to SSD. Too much modified data in RAM in a liability!
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LEARN ABOUT DEBIAN
raidfile.conf
RAIDFILE.CONF(5) Box Backup RAIDFILE.CONF(5)
NAME
raidfile.conf - Userland RAID for Box Backup
SYNOPSIS
/etc/box/raidfile.conf
DESCRIPTION
The raidfile.conf is usually generated by raidfile-config(8) but may be manually edited if the store locations move or if more than one
disc set is required.
discX
Specifies a set of discs.
SetNumber
The set number of the RAID disc, referenced by each account.
BlockSize
The block size of the file system (usually 2048). Under BSD with FFS, set this to your file system's fragment size (most likely an
8th of the block size).
Dir0
The first directory in the RAID array.
Dir1
The second directory in the RAID array. If you do not wish to use the built-in RAID functionality, this field should be set to the
same as Dir0. You should not use the built-in RAID if you have a hardware RAID solution or if you're using another type of software
RAID (like md on Linux).
Dir2
The third directory in the RAID array. The same notes that apply to Dir2 also apply to Dir3.
FILES
/etc/box/raidfile.conf
SEE ALSO
raidfile-config(8), bbstored.conf(5)
AUTHORS
Ben Summers
Per Thomsen
James O'Gorman
Box Backup 0.11 10/28/2011 RAIDFILE.CONF(5)