73 lines
3.8 KiB
Plaintext
73 lines
3.8 KiB
Plaintext
# Problem #1: Multiple IB fabrics needing a subnet manager
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#
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# In the event that a machine has more than one IB subnet attached,
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# and that machine is an opensm server, by default, opensm will
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# only attach to one port and will not manage the fabric on the
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# other port. There are two ways to solve this problem:
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#
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# 1) Start opensm on multiple machines and configure it to manage
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# different fabrics on each machine
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# 2) Configure opensm to start multiple instances on a single
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# machine
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#
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# Both solutions to this problem require non-standard configurations.
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# In other words, you would normally have to modify /etc/rdma/opensm.conf
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# and once you do that, the file will no longer be updated for new
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# options when opensm is upgraded. In an effort to allow people to
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# have more than one subnet managed by opensm without having to modify
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# the system default opensm.conf file, we have enabled two methods
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# for modifying the default opensm config items needed to enable
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# multiple fabric management.
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#
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# Method #1: Create multiple opensm.conf files in non-standard locations
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# Copy /etc/rdma/opensm.conf to /etc/rdma/opensm.conf.<number>
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# (do this once for each instance you want started)
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# Edit each copy of the opensm.conf file to reflect the necessary changes
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# for a multiple instance startup. If you need to manage more than
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# one fabric, you will have to change the guid option in each file
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# to specify the guid of the specific port you want opensm attached
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# to.
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#
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# The advantage to method #1 is that, on the off chance you want to do
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# really special custom things on different ports, like have different
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# QoS settings depending on which port you are attached to, you have the
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# freedom to edit any and all settings for each instance without those
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# changes affecting other instances or being lost when opensm upgrades.
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#
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# Method #2: Specify multiple GUIDS variable entries in this file
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# Uncomment the below GUIDS variable and enter each guid you need to attach
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# to into the list. If using this method you need to enter each
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# guid into the list as we won't attach to any default ports, only
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# those specified in the list.
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#
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#GUIDS="0x0002c90300048ca1 0x0002c90300048ca2"
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#
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# The obvious advantage to method #2 is that it's simple and doesn't
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# clutter up your file system, but it is far more limited in what you
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# can do. If you enable method #2, then even if you create the files
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# referenced in method #1, they will be ignored.
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#
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# Problem #2: Activating a backup subnet manager
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#
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# The default priority of opensm is set so that it wants to be the
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# primary subnet manager. This is great when you are only running
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# opensm on one server, but if you want to have a non-primary opensm
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# instance for failover, then you have to manually edit the opensm.conf
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# file like for problem #1. This carries with it all the problems
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# listed above. If you wish to enable opensm as a non-primary manager,
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# then you can uncomment the PRIORITY variable below and set it to
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# some number between 0 and 15, where 15 is the highest priority and
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# the primary manager, with 0 being the lowest backup server. This method
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# will work with the GUIDS option above, and also with the multiple
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# config files in method #1 above. However, only a single priority is
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# supported here. If you wanted more than one priority (say this machine
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# is the primary on the first fabric, and second on the second fabric,
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# while the other opensm server is primary on the second fabric and
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# second on the primary), then the only way to do that is to use method #1
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# above and individually edit the config files. If you edit the config
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# files to set the priority and then also set the priority here, then
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# this setting will override the config files and render that particular
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# edit useless.
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#
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#PRIORITY=15
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