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Open Fabrics Enterprise Distribution (OFED)
iSER initiator in OFED 1.4 Release Notes
December 2008
* Background
iSER allows iSCSI to be layered over RDMA transports (including
InfiniBand and iWARP (RNIC)).
The OpenFabrics iSER initiator implementation is interoperable with
open-iscsi (http://www.open-iscsi.org/). It provides an alternative
transport to iscsi_tcp in the open-iscsi framework. The iSER transport
exposes a transport API to scsi_transport_iscsi, and a SCSI LLD API to
the Linux SCSI mid-layer (scsi_mod). Currently, the OpenFabrics iSER
initiator can be layered over InfiniBand (no iWARP support yet).
* Supported platforms
SLES 10
SLES 10 sp1
SLES 10 sp2
RHAS 4 up4
RHAS 4 up5
RHAS 4 up6
RHAS 4 up7
RHEL 5
RHEL 5.1
RHEL 5.2
The release has been tested against Voltaire iSCSI over iSER target
running in Voltaire's IB/Fibre-Channel router (SR4G) and the STGT
target.
* Fixed Bugs and Enhancements since OFED 1.3
iSER:
- Add logical unit reset support
- Update URLs of iSER docs
- Add change_queue_depth method
- Fix list iteration bug
- Handle iser_device allocation error gracefully
- Don't change ITT endianness
- Move high-volume debug output to higher debug level
- Count FMR alignment violations per session
Open-iSCSI:
- Update open-iscsi rpm versions from
2.0-754 to 2.0-754.1 and from 2.0-865.15 to 2.0-869.2
- Change open-iscsi defaults
- iscsi_discovery: fixed printing debug information
- iscsi_discovery: check if iscsid is running
- Set open-iscsi for auto-startup when installing OFED
- iscsiadm: bail out if daemon isn't running
* Known Issues
Open-iSCSI:
- modifing node transport_name while session is active
will create stale session. It will be deleted only after reboot.
- This issue is scheduled for OFED1.4 as part of new open-iscsi version.
* Installation/upgrade of open-iscsi
If iSER is selected to be installed with OFED, open-iscsi will be also
installed (or upgraded if another version of open-iscsi is already
installed). Installing/upgrading open-iscsi is required for iSER to
work properly. Before installing OFED, please make sure that no version
of open-iscsi is installed or add the following key to your ofed.conf
file: upgrade_open_iscsi=yes. Using this key will remove any old version
of open-iscsi.
If an older version of open-iscsi was installed, it is recommended to
delete its records before running open-iscsi. This can easily be done by
running the following command (while open-iscsi is stopped):
rm -rf /etc/iscsi/nodes/* /etc/iscsi/send_targets/*
Then, open-iscsi may be started, and targets may be discovered by running
'iscsi_discovery <target_ip>'.
* iSER links
Wiki pages
Information on building/configuring/running the open iscsi initiator over
iSER: https://wiki.openfabrics.org/tiki-index.php?page=iSER
IETF pages
iSCSI and iSER specifications come out of the IETF IP storage (IPS) work
group.
iSCSI specification: http://www.ietf.org/rfc/rfc3720.txt
iSER specification: http://www.ietf.org/rfc/rfc5046.txt
"About" page
general and detailed information on iSCSI and iSER
http://www.voltaire.com/Products/Server_Products/iSER_iSCSI_RDMA
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