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ib_srpt: Document InfiniBand partition key choice

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4373 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Bart Van Assche
2012-06-22 11:58:43 +00:00
parent 1a8a37a9da
commit 44df4a03b6
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srpt/README
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@@ -271,6 +271,25 @@ http://www.garloff.de/kurt/linux/#rescan-scsi. An example:
$ rescan-scsi-bus --hosts=${srp_host_id} --channels=0 --ids=0 --luns=0-31
InfiniBand Partitions
---------------------
Just like a VLAN allows to segment traffic on an Ethernet network partitions
allow to segment traffic on an InfiniBand network. Each InfiniBand partition
is identified by a partition key which is a 16-bit number. During fabric
initialization the subnet manager assigns one or more partition keys to
each InfiniBand port. For opensm partitions are defined in
/etc/opensm/partitions.conf. ib_srpt uses the partition with index 0. Which
partition key corresponds to index 0 can be found out by querying sysfs:
$ head /sys/class/infiniband/*/ports/*/pkeys/0
==> /sys/class/infiniband/mlx4_0/ports/1/pkeys/0 <==
0xffff
==> /sys/class/infiniband/mlx4_0/ports/2/pkeys/0 <==
0xffff
High availability
-----------------