Date: Sat, 28 Jan 2012 00:23:37 -0800 From: Ravi Pokala <rp_freebsd@mac.com> To: freebsd-geom@freebsd.org Subject: Bootable RAID10 on 9.0-RELEASE Message-ID: <CB48F088.AB1D7%rp_freebsd@mac.com>
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Hi folks,
I'm putting together a server, and I want to balance performance and
reliability by putting everything on a four-disk RAID10 array.
+----------+ +----------+ +----------+ +----------+
| da0 | | da1 | | da2 | | da3 |
| | | | | | | |
| | | | | | | |
| | | | | | | |
| | | | | | | |
+----------+ +----------+ +----------+ +----------+
Based on past experience with creating mirrored roots on older versions
(but with the added complexity of the stripes), I would expect the
procedure to look something like this, but I would like confirmation
and/or corrections:
1) Install the base system on a spare drive:
+-----------------------------------+
| dad0p1 freebsd-boot loader |
+-----------------------------------+
| dad0p2 freebsd-ufs / |
+-----------------------------------+
| dad0p3 freebsd-swap swap |
+-----------------------------------+
| dad0p4 freebsd-ufs /var |
+-----------------------------------+
| dad0p5 freebsd-ufs /usr |
+-----------------------------------+
2) Boot said drive to single-user mode.
3) Use `geom part' to create appropriately sized partitions on each of the
drives for the RAID.
+----------+ +----------+ +----------+ +----------+
| da0p1 | | da1p1 | | da2p1 | | da3p1 |
+----------+ +----------+ +----------+ +----------+
| ... | | ... | | ... | | ... |
+----------+ +----------+ +----------+ +----------+
| da0pN | | da1pN | | da2pN | | da3pN |
+----------+ +----------+ +----------+ +----------+
4) Load the mirror driver:
geom mirror load
5) Create the mirrors:
geom mirror label [-b load?] gm0p1 /dev/da0p1 /dev/da1p1
...
geom mirror label [-b load?] gm0pN /dev/da0pN /dev/da1pN
geom mirror label [-b load?] gm1p1 /dev/da2p1 /dev/da3p1
...
geom mirror label [-b load?] gm1pN /dev/da2pN /dev/da3pN
+--------------------------+ +--------------------------+
| +----------+ | | +----------+ |
| gm0p1 | da0p1 |\ | | gm1p1 | da2p1 |\ |
| +----------+ \ | | +----------+ \ |
| ... | ... |\|\ | | ... | ... |\|\ |
| +----------+ \ + | | +----------+ \ + |
| gm0pN | da0pN |\|\| | | gm1pN | da2pN |\|\| |
| +----------+ \ + | | +----------+ \ + |
| \ \|\| | | \ \|\| |
| \~~~~~~~~~~~\ + | | \~~~~~~~~~~~\ + |
| \ da1pN \| | | \ da3pN \| |
| +-----------+ | | +-----------+ |
+--------------------------+ +--------------------------+
6) Load the stripe driver:
geom stripe load
7) Create the stripes:
geom stripe label gs0p1 /dev/mirror/gm0p1 /dev/gm1p1
...
geom stripe label gs0pN /dev/mirror/gm0pN /dev/gm1pN
+--------------------------------------+
| +----------+ +----------+ |
| gs0p1 | gm0p1 | | gm1p1 | |
| +----------+ +----------+ |
+--------------------------------------+
| +----------+ +----------+ |
| ... | ... | | ... | |
| +----------+ +----------+ |
+--------------------------------------+
| +----------+ +----------+ |
| gs0pN | gm0pN | | gm1pN | |
| +----------+ +----------+ |
+--------------------------------------+
8) Create filesystems on the stripes:
newfs -J -U /dev/stripe/gs0p1
...
newfs -J -U /dev/stripe/gs0pN
9) Remount / and /boot to read-write, edit /etc/fstab to change all
references to /dev/dad0 to /dev/stripe/gs0, edit /boot.loader.conf to add
the loading of the mirror and stripe modules at boot, and change back to
read-only.
10) Copy all files from dad0pN to gs0pN.
11) Reboot
12) Victory!
Somehow, I suspect I'm wrong. In fact, I really hope I'm wrong - RAID10 is
such a common configuration, I expect there must be an easier way.
Thanks,
rp
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