When you are running RedHat Enterprise Linux 5, 6, and 7 series system with DM-Multipath and the software iSCSI initiator, you can discover new LUNs by rescanning the iSCSI service on the host. Rescanning the service will display all the newly created LUNs that have been mapped to the host. This

As a Linux admin, we may come in a situation like, to scan new FC luns or to scan new SCSI Disk which are provided by Storage team. Its need to be scan from the Linux OS side without rebooting server. In this tutorial i will help you to remove LUN safely from a running system , This method should work on All Redhat based systems 5 6 or 7, with command multipath -ll you can all details about your Luns and storage configuration. The ouput of multipath -ll For Macintosh, you have the HFS filesystem and for Linux you have more filesystems than we can list in this tutorial. One of the great things about Linux is that you have the ability to access Mount iSCSI LUNs in Linux. To mount LUNs presented via tgt iSCSI Target from a Linux iSCSI server I need to know the IP address of the iSCSI server's interface used for iSCSI traffic. iSCSI uses TCP ports, usually 3260. SIOC / StorageRM causes very high traffic on SAN datastores; When using the hal daemon with a large number of iSCSI LUNs, over several thousand, the --child-timeout option should be used in order to avoid boot failures. The --child-timeout option sets the number of seconds to wait for all disk probes to run. For example, to force the hal daemon to wait 10 minutes and 30 seconds, the option would read --child-timeout=630. Expanding a LUN on RedHat Linux > RedHat Linux Adding a LUN over Fibre Channel. Posted on January 21, 2015 by admin. and then mount /dev/data-san. After this command completes you will have a resized, usable amount of space that you have specified. How to scan new FC LUNS and SCSI disks in Redhat Linux without rebooting the server? Most of the Linux beginners have to wonder how to do thi