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IBM DS3400 Load Balancing

Posted on 2009-03-29
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I have got an IBM DS3400 storage manager with dual controller directly attached to a IBM X series 366 server via FC HBA. The DS3400 has two logical drives and for both of these logical drives the current owner is controller A. I want to implement load balancing so that 1 logical drive's current owner is controller A and the other logical drive current owner is Controller B. Does anyone have any idea/suggestion how to implement load balancing on DS3400?

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Question by:solution786
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VittorioVeresani earned 750 total points
ID: 24052273
hi,
when you create one LV, the storage assign it to ControllerA; the next to CtrlB, next CtrlA...

Assigns, in the sense that CtrlA or B are the preferred.
If LV2 is arrigned to CtrlB (Preferred), and CtrlB fails, you see LV2 managed by CtrlA.

A LVx may be Preferred by CtrlA but, for some motivation, managed by CtrlB.

First ensure that LV1 and LV2 are preferred respectively by CtrlA and B: if it is not so,
declare for LV2 CtrlB as preferred.

But I believe this is not your situation: for my opinion you have as preferred one LV on each Ctrl,
but in this moment, both LVx are managed by CtrlA. Why ?

You have not SAN switch (directly attached) then no switch problem.
Cables all OK ?
Wich OS is used ?
BIOS FC adapter OK ? Which type ? don't load HBA failover option.
MultiPath SW loaded ? done by OS or IBM software ?

Some storage (I don't remeber if 3400 is one of these) have not automatic failback:
Suppose you have 2 LV, 2Ctrl, 2 HBA, and they are balanced.
Detach a cable: LV2 will be served by CtrlA ; re-attach the cable;
If the storage has auto-failback, LV2 will return under CtrlB control.
If it has not, you have to do manually.

bye
vic
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