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vdev_id: support per-channel slot mappings

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The vdev_id udev helper currently applies slot renumbering rules to
every channel (JBOD) in the system.  This is too inflexible for systems
with non-homogeneous storage topologies.  The "slot" keyword now takes
an optional third parameter which names a channel to which the mapping
will apply.  If the third parameter is omitted then the rule applies to
all channels.  The first-specified rule that can match a slot takes
precedence.  Therefore a channel-specific rule for a given slot should
generally appear before a generic rule for the same slot number.  In
this way a custom slot mapping can be applied to a particular channel
and a default mapping applied to the rest.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2056
This commit is contained in:
Ned Bass
2014-01-13 13:32:41 -08:00
committed by Brian Behlendorf
parent 35d3e32274
commit 09d0b30fd1
3 changed files with 65 additions and 81 deletions
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etc/zfs/vdev_id.conf.sas_direct.example
+14 -11
View File
@@ -8,15 +8,18 @@ channel 85:00.0 0 B
channel 86:00.0 1 C
channel 86:00.0 0 D
# Custom mapping for Channel A
# Linux Mapped
# Slot Slot
slot 1 7
slot 2 10
slot 3 3
slot 4 6
slot 5 2
slot 6 8
slot 7 1
slot 8 4
slot 9 9
slot 10 5
# Slot Slot Channel
slot 1 7 A
slot 2 10 A
slot 3 3 A
slot 4 6 A
# Default mapping for B, C, and D
slot 1 4
slot 2 2
slot 3 1
slot 4 3