[openib-general] srp initiator device discovery

[Vu Pham]

How many cable did you connect from your host to fabric?

If you have two cables (2 ports of same hca or each port of 
2 hcas) connected then you have two paths to same srp 
target. Each path will see the same number of luns of srp 
target. You can work with dm-multipath/multipath and access 
the luns/devices thru /dev/mapper - this will provide you 
capability of fail-over/fail-back functionality

IBGD's srp target only works with scsi devices. It does not 
work with block devices (hdX, md, lvm volules ...)

-vu

> Hi,
> 
>    I have srp initiator installed with OFED-1.1, and another machine
> with SRP target (IBGOLD). I started the srp daemon to discover the
> target devices, and then ran fdisk -l to see the list. The list (below)
> shows duplicate devices :-
> 
> Disk /dev/sdb: 2199.0 GB, 2199023255552 bytes
> 255 heads, 63 sectors/track, 267349 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
> Disk /dev/sdb doesn't contain a valid partition table
> 
> Disk /dev/sdc: 2199.0 GB, 2199023255552 bytes
> 255 heads, 63 sectors/track, 267349 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> 
> Disk /dev/sdd: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sdd1   *           1          13      104391   83  Linux
> /dev/sdd2              14       60801   488279610   8e  Linux LVM
> 
> Disk /dev/sde: 2199.0 GB, 2199023255552 bytes
> 255 heads, 63 sectors/track, 267349 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
> Disk /dev/sde doesn't contain a valid partition table
> 
> Disk /dev/sdf: 2199.0 GB, 2199023255552 bytes
> 255 heads, 63 sectors/track, 267349 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> 
> Disk /dev/sdg: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sdg1   *           1          13      104391   83  Linux
> /dev/sdg2              14       60801   488279610   8e  Linux LVM
> 
> 
> 
> Doing some tests I found that sdb=sde, sdc=sdf, and sdd=sdg (obvious).
> 
> I also tested the device discovery after creating an md device on the
> target side, and found that the initiator doesn't take into account the
> presence of an md device. Is this the expected behaviour ?
> 
> Thanks for your time!
> 
> Vishal
> 
> 
> _______________________________________________
> openib-general mailing list
> openib-general at openib.org
> http://openib.org/mailman/listinfo/openib-general
> 
> To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
>