![]() ![]() You can use the SCSI rescan script to remove an unmapped LUN from the host. This means you should make sure each LUN has a unique file system label and then mount the file system using that label. With DM Multipath configured, a failure at any of the points of the I/O path to either of the RAID devices causes DM Multipath to switch to the alternate I/O path for that device. When you have multiple LUNs, you must be able to persistently identify each LUN across system reboots. In this configuration, there are two HBAs on the server, two SAN switches, and two RAID devices with two RAID controllers each. The Linux Host sees LUNs on the storage system as SCSI devices. ![]() Enabling device persistence for newly discovered LUNs.When you are using DM-Multipath, you can use the sanlun command to confirm that DM-Multipath is set up. (Native multipathing) Using sanlun to display DM-Multipath information.If you are using an iSCSI software initiator, you also have a choice between using the iscsiadm command or the iscsi command, depending on your version of Linux. The sanlun lun show all command works for all environments and protocols. Whether your environment uses multipathing or not, you have several options for viewing LUNs that are mapped to the host. Reloading the service displays all the newly created LUNs that have been mapped to the host. When you are running Red Hat Enterprise Linux 4 series with DM-Multipath and the software iSCSI initiator, you can discover new LUNs by reloading the iSCSI service on the host. (Software iSCSI, multipathing) Discovering new LUNs on Red Hat 4.Rescanning the service displays all the newly created LUNs that have been mapped to the host. When you are running Red Hat Enterprise Linux 5, 6, and 7 series or SUSE Linux Enterprise Server 10 or 11 series with DM-Multipath and the software iSCSI initiator, you can discover new LUNs by rescanning the iSCSI service on the host. (Software iSCSI, multipathing) Discovering new LUNs on Red Hat 5, 6, 7 and SUSE 10, 11.When you are using an FC or hardware iSCSI environment, you can use the rescan script to discover the LUNs you have created and mapped to the Linux host. (FC, Hardware iSCSI) Discovering new LUNs. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |