From: "Tore Anderson"
Unfortunately I have found no way to detect if an array is operating in
ALUA or PNR mode and have dm-multipath automatically apply different
device{} sections based on that. I have some nodes that are connected
to both my CX3 and an old CX200 (which doesn't support ALUA), and due to
this I need to use PNR mode on the CX3 too, wich kinda sucks. Time to
get rid of the CX200 I guess.
The comment and code from libmultipath/prioritizers/emc.c
if ( /* Effective initiator type */
sense_buffer[27] != 0x03
/*
* Failover mode should be set to 1 (PNR failover mode)
* or 4 (ALUA failover mode).
*/
|| (((sense_buffer[28] & 0x07) != 0x04) &&
((sense_buffer[28] & 0x07) != 0x06))
/* Arraycommpath should be set to 1 */
|| (sense_buffer[30] & 0x04) != 0x04) {
pp_emc_log(0, "path not correctly configured for failover");
}
doesn't help with the detection part?
- Sebastian
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