ds2405 splt on two 5470's

[Adam Hicks]

Is it possilbe to divide the disks in a single 2405 between two Rp5470's? Example; 8 total disks in the 2405, can one of my 5470's access 4 disk, and the other 5470 access the other 4 disk??

[Stefan Stechemesser]

You can do it, but other than on the SCSI enclosures DS230X there is no split bus configuration that would divide the enclosure into two independent parts.
Both L-Classes would have access to all disks in the enclosure and you have to take care that each system only accesses its own disks.
By the way, the only supported configuration is either to directly connect each host only to one of the LCCs or, if you need more redundance, use a hub or a switch. Connecting both L-Classes to both LCCs may work, but not under all circumstances and we do not support it. The use of the 2nd expansion port on the LCC is intended for daisy chaining multiple DS2405s.

best regards

Stefan

[Wim Rombauts]

Yes you can, but as Stefan already told, the configuration is pure software.
So as soon that you have created a volume group on each system and added the correct disks to the volume group on each system, the hard work is over.

[Ted Buis]

DS2405 uses dual ported disks. There are two ports for each FC bus, so you can connect two computers (or daisy chain) each with redundany FC HBAs, one HBA on each computer to each side of the enclosure. This is very nice for setting up a dual node cluster with ServiceGuard and MirrorDisk/UX. You have no single points of failure in the disk subsystem. If you use ServiceGuard, you need to see all the disks, and you can, so this works fine. However, you must be careful as disks are seen from both operating systems, and you shouldn't mount them to both systems at the same time. There is nothing to prevent this from occuring unless you use SG properly.