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Hello,
i have been testing Red Hat Enterprise Virtualization 3 beta with Open-E VSS 6 as a iscsi Storage.
The problem is now, that Red Hat Enterprise Virtualization 3 beta can't attach a Open-E VSS 6 iscsi lun, because there block size is bigger than 512bytes (Red Hat Enterprise Virtualization 3 beta supports only 512bytes LUN's).
My Question is now, how i can create a iscsi 512bytes block size LUN in Open-E VSS 6?
thanks.
Hi. I'm almost 100% that the blocksize is 512. The only location where block size can be changed is for FC targets.
Are you sure that is your issue? Can you provide a dmesg output after you've connected to the iSCSI target?
Thanks for answer.
The problem is that i can't attach the LUN, because there is not a 512bytes block size.
Here is a picture of the failure:
http://imageshack.us/photo/my-images/716/rh3testa.jpg
:-(
i hava a update.
I have not issue when i use the "iet" target or "scst vpd 1.0".
Only i have with "scst vpd 2.0" this block size error.
Why?
I think i have found the bug...
SCST VPD 1.0:
I have attach this to Red Hat Enterprise Linux 6.2:
Platte /dev/sdb: 34.3 GByte, 34292629504 Byte
64 Köpfe, 32 Sektoren/Spur, 32704 Zylinder
Einheiten = Zylinder von 2048 × 512 = 1048576 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Jan 16 16:00:04 localhost kernel: connection10:0: detected conn error (1020)
Jan 16 16:00:04 localhost kernel: scsi13 : iSCSI Initiator over TCP/IP
Jan 16 16:00:04 localhost iscsid: Connection10:0 to [target: iqn.2012-01:dsstest.target6, portal: 10.21.32.200,3260] through [iface: default] is shutdown.
Jan 16 16:00:04 localhost kernel: scsi 13:0:0:0: Direct-Access SCST_BIO CVTjrfRmPxVzoKGe 101 PQ: 0 ANSI: 4
Jan 16 16:00:04 localhost kernel: sd 13:0:0:0: Attached scsi generic sg2 type 0
Jan 16 16:00:04 localhost kernel: sd 13:0:0:0: [sdb] 66977792 512-byte logical blocks: (34.2 GB/31.9 GiB)
Jan 16 16:00:04 localhost kernel: sd 13:0:0:0: [sdb] Write Protect is off
Jan 16 16:00:04 localhost kernel: sd 13:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
Jan 16 16:00:04 localhost kernel: sdb: unknown partition table
Jan 16 16:00:04 localhost kernel: sd 13:0:0:0: [sdb] Attached SCSI disk
Jan 16 16:00:05 localhost iscsid: Connection11:0 to [target: iqn.2012-01:dsstest.target6, portal: 10.21.32.200,3260] through [iface: default] is operational now
SCST VPD 2.0:
I have attach this to Red Hat Enterprise Linux 6.2:
Platte /dev/sdb: 30.8 GByte, 30836523008 Byte
64 Köpfe, 32 Sektoren/Spur, 29408 Zylinder
Einheiten = Zylinder von 2048 × 512 = 1048576 Bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 1048576 bytes
Disk identifier: 0x00000000
Jan 16 16:14:46 localhost kernel: connection14:0: detected conn error (1020)
Jan 16 16:14:46 localhost kernel: scsi17 : iSCSI Initiator over TCP/IP
Jan 16 16:14:47 localhost iscsid: Connection14:0 to [target: iqn.2012-01:dsstest.target3, portal: 10.21.32.200,3260] through [iface: default] is shutdown.
Jan 16 16:14:47 localhost kernel: scsi 17:0:0:0: Direct-Access SCST_BIO 6Wf6W6WPjOV2J27z 200 PQ: 0 ANSI: 5
Jan 16 16:14:47 localhost kernel: sd 17:0:0:0: Attached scsi generic sg2 type 0
Jan 16 16:14:47 localhost kernel: sd 17:0:0:0: [sdb] 60227584 512-byte logical blocks: (30.8 GB/28.7 GiB)
Jan 16 16:14:47 localhost kernel: sd 17:0:0:0: [sdb] 4096-byte physical blocks
Jan 16 16:14:47 localhost kernel: sd 17:0:0:0: [sdb] Write Protect is off
Jan 16 16:14:47 localhost kernel: sd 17:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
Jan 16 16:14:47 localhost kernel: sdb: unknown partition table
Jan 16 16:14:47 localhost kernel: sd 17:0:0:0: [sdb] Attached SCSI disk
Jan 16 16:14:48 localhost iscsid: Connection15:0 to [target: iqn.2012-01:dsstest.target3, portal: 10.21.32.200,3260] through [iface: default] is operational now
This is a interesting Line:
by SCST VPD 1.0:
Sector size (logical/physical): 512 bytes / 512 bytes
by SCST VPD 2.0:
Sector size (logical/physical): 512 bytes / 4096 bytes
I think that the physical sector size of 4096 bytes is the problem, but how i can fix this?
Ahh yes. Go ahead and set it to VPD to 1. You won't loose any functionality or performance.
But what is the difference of SCST VPD 1.0 and SCST VPD 2.0?
When both the same, why SCST VPD 2.0?
the VPD value sets the way the device is identified. VPD=2 is the new way in SCST, VPD=1 is the old way and compatible to IET identities.