For the sake of completeness we need to validate everything works
well not just on IDE or SCSI drives. But we need to verify a
zpool configured on top of the Linux virtual block devices.
These scripts simply that testing process, and have shown that
while everything is good on top of a ram disk. Right now the
code base panics the kernel when layered on top of either an
md or dm style device. For the moment don't do that.
To simplify creation and management of test configurations the
dragon and x4550 configureis have been integrated with udev. Our
current best guess as to how we'll actually manage the disks in
these systems is with a udev mapping scheme. The current leading
scheme is to map each drive to a simpe <CHANNEL><RANK> id. In
this mapping each CHANNEL is represented by the letters a-z, and
the RANK is represented by the numbers 1-n. A CHANNEL should
identify a group of RANKS which are all attached to a single
controller, each RANK represents a disk. This provides a nice
mechanism to locate a specific drive given a known hardware
configuration. Various hardware vendors use a similar scheme.
A nice side effect of these changes is it allowed me to make
the raid0/raid10/raidz/raidz2 setup functions generic. This
makes adding new test configs easy, you just need to create
a udev rules file for your test config which conforms to the
naming scheme.
The current test rig consists of two 60 disk dragon drawers in configured
in 4-x15 mode. Each drawer has 4 SAS connections to my node for a total
of 8 SAS connections spread over 4 dual-port LSI SAS adapters. The
configures are as follows:
- raid0: All 120 drives in a single pool.
- raidz: 15 RAIDZ groups of 7+1.
- raidz2: 15 RAIDZ2 groups of 6+2.
This change extends the existing in-tree test infrastructure such
that it can also be run as part of a the installed package. This
simplifies testing on multiple systems and is generally all around
useful. The scripts may still be run in-tree and will use the
in-tree build products as long as .script-config exists.
SLES10 ships util-linux-2.12r-35.30 which does not support the -f option
to losetup. To avoid this problem the unused_loop_device() function was
added which attempts to find an unused loop device by checking each
/dev/loop* device with losetup to see if it is configured.
Brian Behlendorf