Hi,
I'm having some problems accessing the full capacity of iscsi targets greater
than 2TB from my Linux clients.
Background on my setup:
Solaris 10U4 (x64) iSCSI target host (hostname: filestore)
- Dual-core Opeteron CPU
- 2 x 1Gb NICs
- 8 x 500GB SATA drives configured as RAIDZ2 ZFS pool
CentOS 5 (x86_64) iSCSI initiator (Open-iSCSI v. 2.0.742) (hostname: shuttle)
- AMD AM2 CPU
- 1 x 1GB NIC
----
On the Solaris box (filestore):
1. I created my RAIDZ2 pool with ZFS:
zpool create pool raidz2 c0t0d0 c0t1d0 c0t2d0 c0t3d0 c0t4d0 c0t5d0 c0t6d0 c0t7d0
2. Created a zvol:
zfs create -V 2.5T pool/iscsi
3. Shared it via iSCSI:
zfs set shareiscsi=on pool/iscsi
4. iSCSI Target details:
bash-3.00# iscsitadm list target -v
Target: pool/iscsi
iSCSI Name: iqn.1986-03.com.sun:02:68cc2dec-6716-491d-d06a-ea1bbf556eee
Alias: pool/iscsi
Connections: 1
Initiator:
iSCSI Name: iqn.2005-03.com.redhat:01.91f2f51267f
Alias: shuttle
ACL list:
TPGT list:
LUN information:
LUN: 0
GUID: 010000e08144f18200002a0047047538
VID: SUN
PID: SOLARIS
Type: disk
Size: 2.5T
Backing store: /dev/zvol/rdsk/pool/iscsi
Status: online
On my Linux box (shuttle):
1. Start the iscsi daemon
service iscsi start
2. Discover the targets from filestore
iscsiadm -m discovery -t st -p 10.1.0.40
3. Login to the target to present the disk to the OS
iscsiadm -m node -T iqn.1986-03.com.sun:02:68cc2dec-6716-491d-d06a-ea1bbf556eee
-p 10.1.0.40:3260 --login
4. Disk shows up as /dev/sdd within Linux:
SCSI device sdd: 4294967296 512-byte hdwr sectors (2199023 MB)
However, it should be 2.5TB rather than 2TB. I get the following errors when I
login to the target:
sdd : very big device. try to use READ CAPACITY(16).
connection22:0: iscsi: detected conn error (1002)
connection22:0: iscsi: detected conn error (1002)
*snip*
connection22:0: iscsi: detected conn error (1002)
connection22:0: iscsi: detected conn error (1002)
sdd : READ CAPACITY(16) failed.
sdd : status=0, message=00, host=2, driver=00
sdd : use 0xffffffff as device size
SCSI device sdd: 4294967296 512-byte hdwr sectors (2199023 MB)
Anyone have any ideas? I figured I would start here first because the "READ
CAPACITY(16)" error message seems to indicate a potential incompatibility with
the iSCSI target and Linux Open-iSCSI initiator. Let me know if there's any
troubleshooting or diagnostics that I can perform.
Thanks,
mathrock
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