ESXi使用本地磁盘做RDM_esxirdm资源-CSDN文库

本地磁盘

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ESX 用本地磁盘做 RDM 的方法

由于本地磁盘的标识号很复杂，所以建议用 SSH 连接，推荐用 putty，后面附上 putty

的使用,最主要的是红色的部分

VMTN Communities forum users have recently been asking how to make use of a LUN or partition on your local host within a virtual machine (VM) the same way you would if you had a SAN

available. This is a more difficult task than some, and not every RAID controller allows this when using the VMware Infrastructure Client. We have to resort to command-line methods to make

this happen.

A VM with a raw disk or raw disk map (RDM) allows the guest OS to write directly to the LUN or disk partition within a LUN assigned to it, utilizing a pass-through mechanism. Using a raw

disk or RDP won’t result in a noticeable performance gain, but there is often an improvement in management. In general, when a VMDK grows past a certain size set by the administrator, the

administrator will opt to use a raw disk or RDM.

With VMware ESX v2.5 and ESX v3.0 it took a few simple VM configuration file edits to enable a raw disk when using local storage. Unfortunately, those methods no longer work on VMware

ESX v3.5. There is, however, a solution. It is not very elegant, but it will work.

The solution is to use vmkfstools to import or copy a virtual machine disk file to the LUN or partition to use for the raw device. Here is an example that I just tested and seems to work. First, I

needed to find out which device held the LUN I was going to assign to my VM.

1. Run fdisk -l to find the LUN.

# fdisk -l

Disk /dev/cciss/c0d0: 146.8 GB, 146807930880 bytes

255 heads, 63 sectors/track, 17848 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/cciss/c0d0p1 * 1 13 104391 83 Linux

/dev/cciss/c0d0p2 14 650 5116702+ 83 Linux

/dev/cciss/c0d0p3 651 1287 5116702+ 83 Linux

/dev/cciss/c0d0p4 1288 17848 133026232+ f Win95 Ext'd (LBA)

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