scsi priority

[RogerVI]

Hi,

I need to extract one internal disk of one server (this is a rp5430 running HP-UX 11i V1 with lvm mirror) because I need to configure the mirror of lvols of another server more critical.
In the server rp5430, I have the following output from stm:

0                    Bus Adapter (803)         Information Successful
0/0                  PCI Bus Adapter (782)     Information Successful
0/0/0/0              Core PCI 100BT Interface  Information Successful
0/0/1/0              PCI SCSI Interface (10000 Information Successful
0/0/2/0              PCI SCSI Interface (10000 Information Successful
0/0/2/0.6.0          SCSI Disk (HP18.2GST31840 Information Successful
0/0/2/1              PCI SCSI Interface (10000 Information Successful
0/0/2/1.6.0          SCSI Disk (HP18.2GST31840 Information Successful
0/0/4/1              RS-232 Interface (103c104 Information Successful
...


Then, the two disks are 0/0/2/0.6.0 and 0/0/2/1.6.0.
What do you recommend extract, according to the scsi priority ?
Thanks in advance

[Matti_Kurkela · Accepted solution]

Since the disks are on separate SCSI interfaces, and both buses don't seem to have any other devices connected to them, the SCSI priority will not be an issue.

Disk 0/0/2/0.6.0 is attached to SCSI interface 0/0/2/0 and disk 0/0/2/1.6.0 to SCSI interface 0/0/2/1, respectively.

Both interfaces are physically located on the Core I/O card. According to rp5430 documentation, all core I/O SCSI interfaces and the core LAN share a single 250 MB/s PCI bus (hardware path 0/0).

By the way, are you sure this is a rp5430? According to the hardware paths, the SCSI IDs are 6 on both disks. With rp5430's internal hot-plug disk slots, the values are hardwired to each slot, and should be 0 and 2 on each bus, respectively. I think the paths look more like a rp24xx system.

To confirm the system model, please run the "model" command.

To get the most up-to-date information on disks, you might want to run "ioscan -fnCdisk": if the result does not agree with the output of stm, you might want to tell stm to rescan the hardware.

[Torsten.]

This is IMHO a rp7400 (aka N4000) - but these disks are on seperate SCSI busses, so there is no difference in priority.

[RogerVI]

Thanks Matti and Torsten
You are right. I made a mistake. The source server is a rp7400. (i confused because the destination server is a rp5430)
One more question, not directly related to my fisrt question.
The "scsi reset" affect only to scsi interface, or to all pci bus ?

Thanks for your help

[Torsten.]

Such resets occur "per SCSI bus" - in your case it affects only a single disk.

[RogerVI]

Thanks