iSCSI initiator and Dell PowerVault MD3000i

[Miroslav Lachman]

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...
>>
>> Does anyone have FreeBSD's iSCSI initiator in production / heavy load?
>> Or does somebody have experiences with Dell MD3000i?
>>
>> One thing is "poor performance" ~ 60 - 70MB/s depending on RAID level
>> used. (poor performance compared to plain SATA disk which have 110MB/s -
>> both tested for reading as it is our planned load - multimedia streaming
>> and downloads)
>>
>>
>> The other thing is some problem with compatibility of initiator and Dell
>> MD3000i.
>>
>> 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:

[...]

>> Can somebody advice some tweaks to get better performance and solution
>> of the errors above?
>
> hi Miroslav,
> firstly, in case you haven't yet, get the latest from:
> 	ftp://ftp.cs.huji.ac.il/users/danny/freebsd/iscsi-2.2.3.tar.gz
> the slowness is probably due to the scsi errors, which I need some scsi expert
> (hence the cc to scsi at freebsd.org, hint, hint).
> In the mean time, and if you can/want, you can allow me access to an iscsi
> partition
> so that I can better debug the issue.
> oh, and yes, we use it here.
>
> 	danny

Hi Danny,
thank you for your reply. I will test iSCSI 2.2.3 and if it fails, I 
will give you an access to the machine to let you debug the errors.

Thank you again!

Miroslav Lachman