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Description of problem: When telling the current block on scsi tape device, it prompted 'Input/output error'. Version-Release number of selected component (if applicable): scsi-target-utils-1.0.24-16.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. Install and setup the scsi target # rpm -q scsi-target-utils || yum -y install scsi-target-utils 2. Disable iptables and selinux. # service iptables stop # setenforce 0 3. Setup the tape target. # service tgtd start # tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.st:tape:sttarget1 # tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL # dd if=/dev/zero of=/root/tape.device bs=1M count=100 # tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --device-type tape --lun 1 -b /root/tape.device # tgtadm --lld iscsi --op show --mode target Target 1: iqn.st:tape:sttarget1 System information: Driver: iscsi State: ready I_T nexus information: LUN information: LUN: 0 Type: controller SCSI ID: IET 00010000 SCSI SN: beaf10 Size: 0 MB, Block size: 1 Online: Yes Removable media: No Prevent removal: No Readonly: No Backing store type: null Backing store path: None Backing store flags: LUN: 1 Type: tape SCSI ID: IET 00010001 SCSI SN: beaf11 Size: 105 MB, Block size: 1 Online: Yes Removable media: Yes Prevent removal: No Readonly: No Backing store type: ssc Backing store path: /root/tape.device Backing store flags: Account information: ACL information: ALL 4. Install and setup the iscsi initiator # rpm -q iscsi-initiator-utils || yum -y install iscsi-initiator-utils # iscsiadm -m discovery -t st -p 127.0.0.1 Starting iscsid: [ OK ] 127.0.0.1:3260,1 iqn.st:tape:sttarget1 # iscsiadm -m node -l Logging in to [iface: default, target: iqn.st:tape:sttarget1, portal: 127.0.0.1,3260] (multiple) Login to [iface: default, target: iqn.st:tape:sttarget1, portal: 127.0.0.1,3260] successful. # rpm -q lsscsi || yum install -y lsscsi # lsscsi | grep -w tape [9:0:0:1] tape IET VIRTUAL-TAPE 0001 /dev/st0 5. Detect the tape device on host and tell the current block on scsi tape device. # lsscsi | grep -w tape # yum install mt* -y # mt -f /dev/st0 tell Actual results: # mt -f /dev/st0 tell /dev/st0: Input/output error Expected results: No error is prompted Additional info: