multipath driver installation

after a hard time, I'm able to boot from ESX 3.5 server with single path, next I'm going to implementing a multipath/fail over. let pull out the whole story first: we have iBM bladecenter s which equipped 2 HS 21 blades(each blade come with 2 HBAs), and 2 SAN switches and one DS 3400 storage which contains 8 SAS drives and 2 controllers. our plan is boot from SAN and go through FC channel to connect DS3400, the topology is: both HBA 0 on blade 1 & 2 go through SAN switch 1 to connect controller A on DS3400, same thing, both HBA 1on blade 1 & 2 go through SAN 2 then connect to controller B on DS3400. in order to install ESX server successful, I disabled SAN 2 and power off blade 2 temporary. when I am done with ESX server installation and loaded it successfuly, I installed VI 3 client on my laptop to access ESX host.
I checked some documents which provided by manufacturers --- iBM/VMware, but I can't find a way to install Multi-Path driver. is there anyone has experiences with this situation.
thanks a lot.
dd2makerAsked:
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BogdanSUACommented:
I have a similar setup using the same IBM blades, switches, and storage.

Here's your problem.

With boot from SAN, you can only have 1 path active for the booting part.  To achieve some level of redundancy, have your first blade boot off of HBA1 and have your other blade boot off HBA2

You can still multipath your VMFS volumes, and no additional software is needed.  You can do that via the VIC.  It happens automatically for you, but vmware uses Most Recently used path first.  I like to use a Fixed policy and multipath my VMFS volumes the way I see fit.
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dd2makerAuthor Commented:
yeah, I don't need to install multi-path driver separately, ESX 3.5 U2 includes that. when I first install ESX, I power off blade 2 and SAN switch 2 manually, after finishing installation and boot into ESX, I re-enable/power on all of them. But something happened today: I did multipath/failure testing by restart/power off different Blades and SAN switches  after I changed multi path policy to Fixed mode, I can't boot into ESX from any one of Blades. by the way, so far we have only 2 blades, if I'm going to re install ESX 3.5, should I power off another blade before installation?  the both blade access same storage, do I have to install dedicated ESX 3.5 instance to each blade?
Thanks.
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dd2makerAuthor Commented:
I just changed out plan which is to separate 2 blades to go to different zone at 2 SAN switches and created more than one logical drive on remote storage and then have blades to boot into their LUN.
right now everything looks good, just enjoying virtual environment (it's my first time to touch VMware)
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