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Scanning iSCSI Interconnects
137
However, if the targets do not send an iSCSI async event, you need to manually scan them using the
iscsiadm utility. Before doing so, however, you need to first retrieve the proper --targetname and
the --portal values. If your device model supports only a single logical unit and portal per target,
use iscsiadm to issue a sendtargets command to the host, as in:
iscsiadm -m discovery -t sendtargets -p target_IP:port
3
The output will appear in the following format:
target_IP:port,target_portal_group_tag proper_target_name
For example, on a target with a proper_target_name of
iqn.1992-08.com.netapp:sn.33615311 and a target_IP:port of 10.15.85.19:3260, the
output may appear as:
10.15.84.19:3260,2 iqn.1992-08.com.netapp:sn.33615311
10.15.85.19:3260,3 iqn.1992-08.com.netapp:sn.33615311
In this example, the target has two portals, each using target_ip:ports of 10.15.84.19:3260
and 10.15.85.19:3260.
To see which iface configuration will be used for each session, add the -P 1 option. This option will
print also session information in tree format, as in:
Target: proper_target_name
Portal: target_IP:port,target_portal_group_tag
Iface Name: iface_name
For example, with iscsiadm -m discovery -t sendtargets -p 10.15.85.19:3260 -P 1,
the output may appear as:
Target: iqn.1992-08.com.netapp:sn.33615311
Portal: 10.15.84.19:3260,2
Iface Name: iface2
Portal: 10.15.85.19:3260,3
Iface Name: iface2
This means that the target iqn.1992-08.com.netapp:sn.33615311 will use iface2 as its
iface configuration.
With some device models (e.g. from EMC and Netapp), however, a single target may have multiple
logical units and/or portals. In this case, issue a sendtargets command to the host first to find new
portals on the target. Then, rescan the existing sessions using:
iscsiadm -m session --rescan
You can also rescan a specific session by specifying the session's SID value, as in:
iscsiadm -m session -r SID --rescan
6
6
For information on how to retrieve a session's SID value, refer to Section 21.2.1, “iSCSI API”.
- Red Hat Enterprise Linux 6 1
- Administration Guide 1
- Storage Administration Guide 2
- Enterprise Linux 6 3
- Edition 0 3
- 1. Document Conventions 9
- 1.2. Pull-quote Conventions 10
- 1.3. Notes and Warnings 11
- 2.1. Do You Need Help? 11
- 2.2. We Need Feedback! 12
- Overview 13
- Storage Considerations During 15
- Installation 15
- 2.3. Special Considerations 16
- LVM (Logical Volume Manager) 19
- 3.1. What is LVM2? 20
- 3.2. Using system-config-lvm 20
- 3.2.3. Migrating Extents 25
- 3.3. References 33
- Partitions 35
- 4.2. Creating a Partition 37
- 4.2.3. Add to /etc/fstab 38
- 4.3. Removing a Partition 39
- 4.4. Resizing a Partition 39
- File System Structure 41
- 5.2.1.2. The /boot/ Directory 43
- 5.2.1.3. The /dev/ Directory 43
- 5.2.1.9. The /proc/ Directory 45
- 5.2.1.11. The /srv/ Directory 45
- 5.2.1.12. The /sys/ Directory 45
- 5.2.1.13. The /usr/ Directory 46
- 5.2.1.14. The /var/ Directory 47
- The Ext3 File System 51
- New Mount Option: data_err 52
- More Efficient Storage Use 52
- The Ext4 File System 55
- Global File System 2 59
- The XFS File System 61
- 9.3. XFS Quota Management 63
- Setting Project Limits 64
- end: ino 1 offset 0 67
- mfile end: ino 1 offset 0 67
- Network File System (NFS) 69
- 10.1.1. Required Services 70
- 10.3. autofs 72
- 10.3.2. autofs Configuration 74
- 10.6.2. The exportfs Command 82
- 10.7. Securing NFS 84
- 10.7.2. Host Access in NFSv4 85
- 10.7.3. File Permissions 85
- 10.8. NFS and rpcbind 86
- 10.9. Using NFS over TCP 87
- 10.10. References 88
- FS-Cache 89
- 11.1. Performance Guarantee 90
- 11.2. Setting Up a Cache 90
- 11.3.1. Cache Sharing 91
- 11.5. Statistical Information 93
- 11.6. References 94
- Encrypted File System 95
- 12.2. Additional Information 96
- 13.1. What is RAID? 97
- 13.2. Who Should Use RAID? 97
- 13.3. RAID Types 97
- Software RAID 98
- 13.5. Linux RAID Subsystems 100
- 13.7. Configuring RAID Sets 101
- Swap Space 103
- 14.2.3. Creating a Swap File 104
- 14.3. Removing Swap Space 105
- 14.4. Moving Swap Space 106
- Disk Quotas 107
- 15.2. Managing Disk Quotas 110
- Best method for most systems 111
- 15.3. References 112
- Access Control Lists 113
- 16.3. Setting Default ACLs 114
- 16.4. Retrieving ACLs 114
- 16.7. References 116
- Write Barriers 117
- Disabling Write Caches 118
- Battery-Backed Write Caches 118
- High-End Arrays 119
- 18.2. Userspace Access 122
- 18.3. Standards 122
- 18.4. Stacking I/O Parameters 123
- 0, and minimum_io_size is a 124
- File System tools 125
- Solid-State Disk Deployment 131
- Guidelines 131
- 20.2. Tuning Considerations 132
- Online Storage Management 133
- 21.2. iSCSI 135
- 21.3. Persistent Naming 135
- 21.3.1. WWID 136
- Important 137
- local timeout=20 142
- local done=1 142
- 21.16.1. Fibre Channel 154
- SCSI Error Handler 156
- 21.16.3. iSCSI Root 157
- 21.18. Troubleshooting 158
- 22.1. Virtual Storage 161
- 22.2. DM-Multipath 161
- Appendix A. Revision History 163
- Glossary 165
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Electrolux IF53X manuals
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