IBM DS6000 Series ユーザーズマニュアル

DS6000 Series: Concepts and Architecture

As explained in the previous chapters, there are several options on how to create logical 
volumes. You can select an extent pool that is owned by one server. There could be just one 
extent pool per server or you could have several. The ranks of extent pools could come from 
arrays on different loops or from the same loop. Figure 4-12 on page 81 shows an optimal 
distribution of four logical volumes within a DS6000. Of course you could have more extent 
pools and ranks, but when you want to distribute your data for optimal performance, you 
should make sure that you spread it across the two servers and across the two loops and 
across several ranks.

If you use some kind of a logical volume manager (like LVM on AIX) on your host, you can 
create a host logical volume from several DS6000 logical volumes (LUNs). You can select 
LUNs from different DS6000 servers and loops as shown in Figure 4-12. By striping your host 
logical volume across the LUNs, you will get the best performance for this LVM volume.

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