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dmp_pathswitch_blks_shift
The number of contiguous I/O blocks (expressed as an integer power of 2) that are sent along a DMP path to an Active/Active array before switching to the next available path.
The default value of this parameter is set to 10 so that 1024 blocks (1MB) of contiguous I/O are sent over a DMP path before switching. For intelligent disk arrays with internal data caches, better throughput may be obtained by increasing the value of this tunable. For example, for the HDS 9960 A/A array, the optimal value is between 15 and 17 for an I/O activity pattern that consists mostly of sequential reads or writes.
The DMP path that is used for a block is calculated as follows:
path = (block# >> dmp_pathswitch_blks_shift) % number of paths
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只能找到这一个,这两个都是关于veritas DMP的,用的比较少,v1上是dmp_pathsw_bshift,v2上是dmp_pathswitch_blks_shift。 |
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