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Full Discussion: iSCSI speed problems
Top Forums UNIX for Advanced & Expert Users iSCSI speed problems Post 302205809 by jeriryan87 on Monday 16th of June 2008 10:33:20 AM
Old 06-16-2008
iSCSI speed problems

Hi all. I was able to set up an IBM Ultrium LTO 4 tape drive to use iSCSI (using open-iscsi drivers) to communicate with Red Hat, but it's going really slow, maxing out in tar and dd tests at like 16 MB/s (using a block size of 128k). The thing is rated for 30MB/s. I feel like even though I have a Gigabit ethernet setup, its only utilizing 100MBit. I have no idea how to mess with network settings either in Red Hat or open-iscsi. Any ideas on what to do, either network or otherwise?

Last edited by jeriryan87; 06-16-2008 at 03:14 PM..
 

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ISCONTROL(8)						    BSD System Manager's Manual 					      ISCONTROL(8)

NAME
iscontrol -- login/negotiator/control for an iSCSI initiator session SYNOPSIS
iscontrol [-dv] [-c file [-n nickname]] [-p pidfile] [-t target] [variable=value] DESCRIPTION
This command, along with its kernel counterpart iscsi_initiator(4), is obsolete. Users are advised to use iscsictl(8) instead. Internet SCSI (iSCSI) is a network protocol standard, that allows the use of the SCSI protocol over TCP/IP networks, the iscontrol program is the userland side of an iSCSI session, see iscsi_initiator(4). It has 2 modes of operation, if -d (discovery session) is specified, it will print out the target names returned by the target and exit. In the second mode, it will, after a successful login/negotiation, run in daemon mode, monitoring the connection, and will try to reconnect in case of a network/target failure. It will terminate/logout the session when a SIGHUP signal is received. The flags are as follows: -c file a file containing configuration key-options, see iscsi.conf(5). -d do a discovery session and exit. -n nickname if -c file is specified, then search for the block named nickname in that file, see iscsi.conf(5). -p pidfile will write the process ID of the session to the specified pidfile -t target the target's IP address or name. -v verbose mode. variable=value see iscsi.conf(5) for the complete list of variables/options and their possible values. EXAMPLES
iscontrol -dt myiscsitarget will start a discovery session with the target and print to stdout the list of available targetnames/targetadresses. Note: this listing does not necessarily mean availability, since depending on the target configuration, a discovery session might not need login/access permission, but a full session certainly does. iscontrol -c /etc/iscsi.conf -n myiscsi will read options from /etc/iscsi.conf, use the targetaddress found in the block nicknamed myiscsi, login and negotiate whatever options are specified, and start an iscsi-session. SEE ALSO
da(4), iscsi_initiator(4), sa(4), iscsi.conf(5), camcontrol(8), iscsictl(8) STANDARDS
RFC 3720 BUGS
iscontrol should probably load the iscsi_initiator module if needed. Not all functions/specifications have been implemented yet, noticeably missing are the Task Management Functions. The error recovery, though not fully compliant does a brave effort to recover from network disconnects. BSD
October 9, 2014 BSD
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