vsphere-esxi-vcenter-server-55-storage-guide

Chapter 27 Using vmkfstoolsWhen specifying the device parameter, use the following format:/vmfs/devices/disks/disk_IDListing Attributes of an RDMThis option lets you list the attributes of a raw disk mapping.-q --queryrdmThis option prints the name of the raw disk RDM. The option also prints other identification information,like the disk ID, for the raw disk.Displaying Virtual Disk GeometryThis option gets information about the geometry of a virtual disk.-g --geometryThe output is in the form: Geometry information C/H/S, where C represents the number of cylinders, Hrepresents the number of heads, and S represents the number of sectors.NOTE When you import virtual disks from hosted VMware products to the ESXi host, you might see a diskgeometry mismatch error message. A disk geometry mismatch might also be the cause of problems loadinga guest operating system or running a newly-created virtual machine.Checking and Repairing Virtual DisksUse this option to check or repair a virtual disk in case of an unclean shutdown.-x , --fix [check|repair]Checking Disk Chain for ConsistencyWith this option, you can check the entire disk chain. You can determine if any of the links in the chain arecorrupted or any invalid parent-child relationships exist.-e --chainConsistentStorage Device OptionsDevice options allows you to perform administrative task for physical storage devices.Managing SCSI Reservations of LUNsThe -L option lets you reserve a SCSI LUN for exclusive use by the ESXi host, release a reservation so thatother hosts can access the LUN, and reset a reservation, forcing all reservations from the target to bereleased.-L --lock [reserve|release|lunreset|targetreset|busreset] deviceCAUTION Using the -L option can interrupt the operations of other servers on a SAN. Use the -L option onlywhen troubleshooting clustering setups.Unless specifically advised by VMware, never use this option on a LUN hosting a VMFS volume.You can specify the -L option in several ways:• -L reserve – Reserves the specified LUN. After the reservation, only the server that reserved that LUNcan access it. If other servers attempt to access that LUN, a reservation error results.• -L release – Releases the reservation on the specified LUN. Other servers can access the LUN again.VMware, Inc. 267