Mark Hahn wrote:
md0 /boot sd[ab]1
md1 / sd[ab]2
md2 /usr sd[ab]3
md3 /var sd[ab]4
...
There are other reasons to use multiple partitions. Having /home as a
separate partition, e.g., allows one to reinstall without copying the data
off to another machine. It also prevents a user from filling up the root
fs, which often has bad consequences. The same goes for partitions for
/tmp and/or /var.
one very serious problem with this approach is that each filesystem
will probably be journaled, which means that it'll spend a lot of time
shuttling the heads between journal and data areas. if you have activity
on /, /usr and /var at the same time, your heads will do little other
than rush madly around. in cases where this can't be avoided (for instance,
using quotas to eliminate the user-fills-partition problem), you can
often improve things markedly by turning on noatime/nodiratime.
Also, depending on the file system, you can set reserved space
percentage for root with tools such as tune2fs.
Tyler.
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