Common Storage

[Saneesh S]

Hi All,

I have two D Class 220 Servers with internal root disk.One is having 2 SCSI cards ; root disk and dat drive are connected to one card internally and one disk station is connected to the same card externally.The other one is having only 1 SCSI card ;root disk and dat drive are connected internally.now the thing is that i have got another disk station that i want to share between both the servers in order implement clustering.that disk station has got two SE ports.if i am connecting 1 server to 1 port and another server to another port the first server is detecting its internal disks ,its'own storage,common storage and internal disks of other server also.is there anyway to terminate the bus.
Yhnx in advance,
Saneesh S

[Mohanasundaram_1]

Hi Saneesh,

Have you modified the SCSI ID on one of these cards. By default both the cards will have SCSI ID 7. This conflict can cause havoc.

Secondly, The inbuilt SCSI controller is not to be used for connecting a storage in an HA environment. You should have a seperate SCSI HBA for connecting this JBOD in HA.

With regards,
Mohan.

[Thayanidhi]

As Mohan said use the add on SCSI card and there should be switch in the SCSI card to enable the terminator. Or refer to the SCSI card documentation. You can terminate both systems SCSI card, so that the physical bus is terminated in both ends.

Regds
TT

[Hein van den Heuvel]

>> have two D Class 220 Servers with internal root disk.One is having 2 SCSI cards ; root disk and dat drive are connected to one card internally and one disk station is connected to the same card externally.

Two cards, or two busses on one card? Or is it perhas a single card with a single bus accessible internally and externally
Doesn't sound right.

>> if i am connecting 1 server to 1 port and another server to another port the first server is detecting its internal disks ,its'own storage,common storage and internal disks of other server also.

Right... they would all be on a single bus.

>> is there anyway to terminate the bus.

With smoke and mirrors in that disk station such that each server and only see it's half on a single bus? No.

Each bus adapter would need a unique address (change one from default 7 to 6) and each system disk would need a unique address (change one from 0 to 1) and the station would need an address different from all.

"got two SE ports". I suspect you are using Single Ended SCSI. Compared to differential this has very restrictive length/speed requirements which would be hard to meet taking internal cabling into account. If it (seems) to work at all in initial tests, it may be unsafe for production use.

You should probably seriously look into additional, dedicated for clustering HBA adapters and FWD connections.

Hope this helps some,
Hein.