In the event that one path becomes intermittently disruptive or is experiencing higher latency, shortest_queue will prevent the utilization of that path reducing the effect of the problem path. The shortest_queue policy will bias IOs towards paths that are servicing IO quicker (paths with shorter queues). A newer MPIO policy, shortest_queue, is similar to round robin in that IOs are distributed across all available Active/Optimized paths, however it provides some additional benefits. The Round Robin (RR) policy distributes IOs evenly across all Active/Optimized paths. The MPIO Policy defines how the host distributes IOs across the available paths to the storage. You can now continue adding your subsequent zoned paths and LUN's.Note: There is an IBM issue where the "devrsrv -f -c release -l hdisk1" command fails to clear SCSI-2 reservation see IBM's IV76821 for 6.1 and IV76995 for 7.1. Versions prior to AIX 6.1TL7 will need to clear these reservations using their preferred method.įor AIX 6.1TL7+ (Including 7.1 and 7.2) run the following to clear the reservation from AIX before proceeding:īash-4.3# devrsrv -f -c release -l hdisk2ĭevice is currently Open on this host by a process. It is possible a SCSI Reservation still exists on the Pure array.Hdisk2 Available 05-00-01 PURE MPIO Drive (Fibre) PURE will have replaced the Other FC drive.
#VERITAS VOLUME MANAGER GUI FOR 7.2 INSTALL#
You can then install the PURE ODM definition.Hdisk2 Available 05-00-01 Other FC SCSI Disk Drive You will only have one hdisk to install on to.Zone only one HBA port on AIX to the desired Pure controller port(s).NOTE: If you are configuring AIX with VIOS, please see the IBM VIOS section below for when and where to install the ODM. The maximum filesystem size for JFS2 file system on AIX is 32 TB. AIX Version 5.3 with the 5300-11 Technology Level and Service Pack 7, or later.AIX Version 5.3 with the 5300-12 Technology Level and Service Pack 4, or later.AIX Version 6.1 with the 6100-04 Technology Level, and Service Pack 10, or later.AIX Version 6.1 with the 6100-05 Technology Level, and Service Pack 6, or later.AIX Version 6.1 with the 6100-06 Technology Level, and Service Pack 5, or later.AIX Version 7.1 with Service Pack 3, or later.The shortest-queue option is available as of the following AIX versions:
The shortest_queue algorithm was added in this ODM, but the default remains round_robin. A chdev to shortest_queue is allowed.
Introduces attribute timeout_policy with the default policy to fail_path.Includes the attribute lbp_enabled,(although not visible) necessary for space reclamation in AIX now that they support in the AIX filesystem.Sets the shortest_queue algorithm as the default path selection policy mechanism.Requires AIX 6.1 TL9, AIX 7.1 T元 or AIX 7.2. Change the default value of reset_delay from 2 to 0.This makes it so that if PURE disks exist the ODM can't be removed. Add the 'x' bit to the permissions of the pre_d file.Change the lower value in the range of rw_timeout from 30 to 10.Changes from the previous version 1.0.0.11:
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