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тАО10-28-2004 12:47 AM
тАО10-28-2004 12:47 AM
I've got a MSL6030 connected to a SAN and a few Windows2003 servers are attached to the SAN as well by means of Emulex Lightpulse PCI Fibre Channel HBA.
The two physical nodes of a MCSC cluster see the same physical drive through another hardware path:
-scsi2:1:2:1C on server 1
-scsi3:1:2:1C on server 2
How do I modify the hadware path on one of the servers so that it is the same on both physical nodes, eg. scsi2:1:2:1C. Is this done somewhere with the tool lputilnt?
For the backup of the virtual servers, the hardware path of the tape drive must be the same on both nodes. Else the backup will fail in case of a failover.
best regards,
Kurt
Solved! Go to Solution.
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тАО10-28-2004 05:56 AM
тАО10-28-2004 05:56 AM
Re: hardware path to SAN attached tape drives
what is the first number after "scsi"? The port number of the adapter?
It looks like the servers are not built symetrically. In that case I am afraid you have to lay your hand on the hardware.
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тАО10-28-2004 06:58 AM
тАО10-28-2004 06:58 AM
Re: hardware path to SAN attached tape drives
The number that differs would be the slot/bus number of the Emulex cards. Can this be changed during the booting of the server, you can go into a BIOS setup program here.
Or must the cards be changed physically in the server. Or are they connected to another SAN swith and must these connections be switched?
We're still in a lab phase, so hardware changes can still be planned without too much unconvenience.
best regards,
Kurt
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тАО10-28-2004 09:02 AM
тАО10-28-2004 09:02 AM
Solutione.g.
both servers has hba's in Slot 2 and 3
Server A's slot 2 is connected to the A fabric and Server B's Slot 2 is connected to the B fabric. Swap the cables and you should be ok. (This looks like what you are seeing, but can't tell without a cabling diagram)
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
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тАО10-28-2004 09:03 AM
тАО10-28-2004 09:03 AM
Re: hardware path to SAN attached tape drives
The main thing I see as a potential problem is that the bus number (SCSI ID on the Emulex card) may also need to be fixed. I'm sure that can also be done within the card config, I just can't say for sure how. With this fixed, you should get a consistent path to the tape drives, and with the bus numbers fixed, these should be the same on both systems.
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тАО10-28-2004 10:06 AM
тАО10-28-2004 10:06 AM
Re: hardware path to SAN attached tape drives
Persistant bindings can also be used to "keep" the config the same across reboots and SAN device additions.
If you only have one library/drive, then it would not matter too much, since only that one drive is available.
I know veritas has a big issue when the bus/scsi id's change on a tape drive. I could see Legato networker having an issue as well. Not sure about DP or other backup products.
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)