Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 User Manual download pdf (Page 213)

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only to a single server at a time. Choose shared to make the VMFS partition available

to virtual machines on multiple physical servers at the same time. The shared option is

useful for failover-based clustering among virtual machines on multiple servers.

To change the accessibility setting, log in to the management interface as root, click

Configure System, then click Edit Disk Partitions. Choose the VMFS accessibility

setting you want, then click Save.

Like most file systems, the VMFS file system does not have the ability to handle

accesses by more than one server simultaneously. When a VMFS partition has its

attribute set to public or shared, ESX Server automatically does appropriate locking

whenever the VMFS file system is accessed. This locking ensures that the VMFS is not

opened by more than one server at a time. If the attribute of the VMFS is set to private,

ESX Server presumes that it cannot be accessed by more than one server at a time

and does not do any locking.

When a VMFS file system is mounted as /vmfs on a particular server, the VMFS file

system is opened and locked by that server. Therefore, no other server can access that

VMFS file system. In particular, no other server can simultaneously mount that file

system on /vmfs. Since only one server at a time can mount a public or shared VMFS

on /vmfs, VMware ESX Server does not mount public or shared VMFS file systems on

/vmfs by default when the system starts. ESX Server only mounts private VMFS file

systems on /vmfs by default.

If you know that only a single server will ever access a particular VMFS file system on

the SAN, you may explicitly mount that VMFS by executing a command such as:

mount-vmfs vmhba0:2:0:1

on that server. This mount-vmfs command may be put in a console operating

system startup script, such as /etc/rc.d/rc.local. You can use mount-vmfs

with the -f option, which will force the mounting of all VMFS partitions that are not

already mounted by another server. See the mount-vmfs(8) man page for details.

If you receive an unexpected error via the management interface when doing a VMFS

operation on a SAN disk, it may be because another server is accessing that VMFS

partition. In particular, another server may have locked the VMFS partition by

mounting the VMFS partition to /vmfs.

Suspend Directory

You may set a virtual machine’s suspend directory to a /vmfs/… path name, so that

the virtual machine’s suspended state file is written to a VMFS file system. Typically,

suspending to a VMFS file system will provide faster performance. However, whenever

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Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 User Manual Page 213