December 2002
Intermediate to advanced
260 pages
9h 18m
English
Content preview from Managing RAID on LinuxBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The /etc/raidtab File
The current raidtools package requires a
configuration file, which, by default, is named
/etc/raidtab. The
/etc/raidtab file contains a stanza about each
software array connected to the system. (A stanza is a collection of
keywords and variables that describe a single array.) The
configuration is parsed from top to bottom so that previously defined
arrays may be used in subsequent stanzas. This is useful when creating
hybrid arrays like RAID-10, but it also means that the order of the
stanzas in /etc/raidtab is extremely important.
Each stanza begins with a raiddev directive and
continues with other directives from the following list.
raiddevmddeviceThe
raiddevparameter begins the configuration of an array. All subsequent directives are assumed to refer to the most recentraiddevdirective.raiddevtakes the full path to the device block special file as its argument (for example,raiddev/dev/md2). A uniqueraiddevdirective is required for each array.raid-levellevelraid-levelspecifies the mode of the current array. This parameter takes an alphanumeric value (see Table 4-1) that corresponds to kernel RAID levels.Table 4-1. raid-level parametersraidtab entry
Description
linear
Linear concatenation
0
Striping
1
Mirroring
4
Single parity drive
5
Distributed parity
multipath
Multipath I/O
Each
raid-leveldirective defined in /etc/raidtab corresponds to the previously definedraiddeventry. In addition, support for the RAID level you have selected usingraid-levelmust be ...
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