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Operating Systems Linux Red Hat Need to mount LUN on two linux boxs (one rw the other ro) caveat details inside Post 302606108 by achenle on Friday 9th of March 2012 02:30:43 PM
Old 03-09-2012
First, to do this properly you need a shared file system on the LUNs. Period.

But, if you can get read-only access to the LUNs, you might be able to make it work on a non-shared if you're willing to play with fire somewhat. Just realize that because of caching you can not guarantee that the read-only host(s) will see any changes made to the file system after they're mounted on the read-only hosts.

So you will get better results if you unmount the file systems before you read from them.

But it will still be playing with fire.
 

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share(1M)																 share(1M)

NAME
share - make local resource available for mounting by remote systems SYNOPSIS
share [-F FSType] [-o specific_options] [-d description] [pathname] The share command exports, or makes a resource available for mounting, through a remote file system of type FSType. If the option -F FSType is omitted, the first file system type listed in /etc/dfs/fstypes is used as default. For a description of NFS specific options, see share_nfs(1M). pathname is the pathname of the directory to be shared. When invoked with no arguments, share displays all shared file sys- tems. -F FSType Specify the filesystem type. -o specific_options The specific_options are used to control access of the shared resource. (See share_nfs(1M) for the NFS specific options.) They may be any of the following: rw pathname is shared read/write to all clients. This is also the default behavior. rw=client[:client]... pathname is shared read/write only to the listed clients. No other systems can access pathname. ro pathname is shared read-only to all clients. ro=client[:client]... pathname is shared read-only only to the listed clients. No other systems can access pathname. Separate multiple options with commas. Separate multiple operands for an option with colons. See . -d description The -d flag may be used to provide a description of the resource being shared. Example 1: Sharing a Read-Only Filesystem This line will share the /disk file system read-only at boot time. share -F nfs -o ro /disk Example 2: Invoking Multiple Options The following command shares the filesystem /export/manuals, with members of the netgroup having read-only access and users on the speci- fied host having read-write access. share -F nfs -o ro=netgroup_name,rw=host1:host2:host3 /export/manuals /etc/dfs/dfstab list of share commands to be executed at boot time /etc/dfs/fstypes list of file system types, NFS by default /etc/dfs/sharetab system record of shared file systems See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ mountd(1M), nfsd(1M), share_nfs(1M), shareall(1M), unshare(1M), attributes(5) Export (old terminology): file system sharing used to be called exporting on SunOS 4.x, so the share command used to be invoked as exportfs(1B) or /usr/sbin/exportfs. If share commands are invoked multiple times on the same filesystem, the last share invocation supersedes the previous--the options set by the last share command replace the old options. For example, if read-write permission was given to usera on /somefs, then to give read- write permission also to userb on /somefs: example% share -F nfs -o rw=usera:userb /somefs This behavior is not limited to sharing the root filesystem, but applies to all filesystems. 9 Dec 2004 share(1M)
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