03-11-2011
How to Find what HBA is configured on Linux?
Hi
I am working in an environment where there are many redhat physical and virtual machines, mostly Redhat 4. These servers have LUNs attached. The external storage can be EMC, NetApp or Par3.
My question is that when Storage Administrator informs that a new LUN has been presented to a particular Redhat Linux server
(1) how do I know what is the LUN ID.
(2) how do I know what kind of HBA is attached to my server.
(3) how do I scan for new LUNs.
Please guide me I have searching over the net for a while, lastly is there a guide/doc on this, the storage guide from Redhat are not in to much detail.
Thanks and regards
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CTLD(8) BSD System Manager's Manual CTLD(8)
NAME
ctld -- CAM Target Layer / iSCSI target daemon
SYNOPSIS
ctld [-d] [-f config-file]
DESCRIPTION
The ctld daemon is responsible for managing the CAM Target Layer configuration, accepting incoming iSCSI connections, performing authentica-
tion and passing connections to the kernel part of the native iSCSI target.
Upon startup, the ctld daemon parses the configuration file and exits, if it encounters any errors. Then it compares the configuration with
the kernel list of LUNs managed by previously running ctld instances, removes LUNs no longer existing in the configuration file, and creates
new LUNs as necessary. After that it listens for the incoming iSCSI connections, performs authentication, and, if successful, passes the
connections to the kernel part of CTL iSCSI target, which handles it from that point.
When it receives a SIGHUP signal, the ctld reloads its configuration and applies the changes to the kernel. Changes are applied in a way
that avoids unnecessary disruptions; for example removing one LUN does not affect other LUNs.
When exiting gracefully, the ctld daemon removes LUNs it managed and forcibly disconnects all the clients. Otherwise - for example, when
killed with SIGKILL - LUNs stay configured and clients remain connected.
To perform administrative actions that apply to already connected sessions, such as forcing termination, use ctladm(8).
The following options are available:
-f config-file
Specifies the name of the configuration file. The default is /etc/ctl.conf.
-d Debug mode. The server sends verbose debug output to standard error, and does not put itself in the background. The server will
also not fork and will exit after processing one connection. This option is only intended for debugging the target.
FILES
/etc/ctl.conf The configuration file for ctld. The file format and configuration options are described in ctl.conf(5).
/var/run/ctld.pid The default location of the ctld PID file.
EXIT STATUS
The ctld utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
ctl(4), ctl.conf(5), ctladm(8)
HISTORY
The ctld command appeared in FreeBSD 10.0.
AUTHORS
The ctld was developed by Edward Tomasz Napierala <trasz@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
BSD
November 9, 2014 BSD