請教幾個關(guān)于DS5000配置及存儲基本概念的問題。

xyk1314521

Host zone 1: HBA_1 is in a zone with DS5000 controller A0.
Host zone 2: HBA_1 is in a zone with DS5000 controller B0.
Host zone 3: HBA_2 is in a zone with DS5000 controller A1.
Host zone 4: HBA_2 is in a zone with DS5000 controller B1.
1，上面這樣的配置，主機每個LUN有4條path。MPIO+SDDPCM應(yīng)該是可以實現(xiàn)load balance的？
2，像以上這種配置，hdisk必須要chdev -l hdisk2 -a reserve_policy=no_reserve -a algorithm=round_robin這樣設(shè)置嗎？使用默認的reserve_policy=single_path，algorithm=failover會有什么問題呢？
3，沒太明白round_robin和load_balance的區(qū)別？
round_robin: Distributes the I/O across all enabled paths. The path priority is determined
by the path priority attribute value. If a path becomes marked failed or disabled, it is no
longer used for sending I/O. The priority of the remaining paths is then recalculated to
determine the percentage of I/O that must be sent down each path. If all paths have the
same value, then the I/O is then equally distributed across all enabled paths.

load_balance: (SDDPCM only) This algorithm is based on the existing load balancing
algorithm, but it also uses the incorporated I/O statistics on each target port to which the
host is connected. You can use this algorithm for SAN configurations where I/O throughput
is unbalanced on the storage targets.

xyk1314521