iSCSI initiator and Dell PowerVault MD3000i

[Ivan Voras]

Sossi Andrej wrote:
> On 16. 12. 2009 15:57, Miroslav Lachman wrote:
>> Daniel Braniss wrote:
>>>> Hi all,
>>>> I am playing with iscsi_initiator on FreeBSD 7-STABLE and Dell
>>>> PowerVault MD3000i. This is the first time I am testing iSCSI...
>>>>
>>>> [...]
>>>>
>>>> If I setup RAID 5 'Disk Group' consisted of 4x 1TB SATA drives (in
>>>> MD3000i) and then created for example 2 'Virtual Disks', both are
>>>> detected by iscontrol and added to /dev/ as da0 and da1, but da1 spams
>>>> log with messages like this:
>>
>> [...]
> I use MD300i with FreeBSD 7.0 and 7.1 with iscsi-2.2.2. It work fine. 
> But be careful to configure MD3000i. MD3000i assign by default first 
> disk to preferred controller 0, second disk to preferred controller 1, 
> third disk to preferred controller 0, and so on. First, third, fifth... 
> disks is usable from FreeBSD, but second, fourth,... disks result unusable.
> Work around: manually assign all disks to controller 0.

When you say "unusable" do you mean you can't access it at all / it 
errors even if it's the only path (drive) used? It would be normal if 
you have for example two paths to each drive and can't mount the other 
path if one path to the drive is mounted - this is not a usable 
combination. You can use geom_multipath to get multipath failover.