The NetApp administrator should be able to tell you if there is any I/O on the LUN, if there is I/O you'll have to find out which server already has the disk access. Otherwise if this was a LUN that was setup using LVM - you will have to export it from one server, import it on the other server and then grow the volumes to the required configuration.
But remember;
If the LUN is already mounted on one server, forcing a mount on an other server - will be bad for the disks health and possibly your future job prospects - depending what's on the LUN.
If this is any kind of HA solution, the LUN will be visible in the service groups and it may have to be scanned from inside the service group.
If this is a NEW LUN and is assigned to a server as /dev/sdb, then you should be able to use the standard admin processes to pull the disk in and use it.
I have created a lun on Storage and connected it to server using fiber channel.
LUN is presented on new Server .
How do i check and mount this newly created LUN? (1 Reply)
Hi,
I am trying to setup multipathing (using DM multipath) for a redhat cluster setup ...all setup is done but issue is :
node 1 shows the shared iscsi lun as sdc
node 2 shows the same as sdg (changes on reboots)
Due to this (i guess) i get i/o error & i can not read files created by... (0 Replies)
Hi,
I have compiled FreeTDS on AIX 5.3. Its my dev environment so I have c compilers on the box so I was able to compile. From the test environment onwards I will not be able to have c compilers. I tried to move these files directly to the test environment with the same directory structure but I... (2 Replies)
Hi All,
I am new for this blog and this is my first Query on this blog. I would like to dael with graet masters on linux.
Here we go,
After storage people created the LUN, How to add that LUN to Linux server. (Make that LUN visibility on linux server.) ?
How to view the LUN... (5 Replies)
I have a list of LUN ID, my task is to find if disk has been added or not. How do I do that? I have been searching the forum and not able to find answer.
thanks (4 Replies)
I just moved a dedicated server, which included moving to a new subnet, and new IP address. Now my server is not reconnecting - I've tried ifconfig, altering the etc/hosts file with the new ip address, with no luck. (5 Replies)
I have a file --> file1.txt
i need to copy this file to another server using FTP....the 2 servers are server1 and server2..may i know how to write a script that can do this?
thanks in advance! Im a newbie to this... (4 Replies)
cmdisklock(1m)cmdisklock(1m)NAME
cmdisklock - manage Serviceguard cluster lock devices.
SYNOPSIS
cmdisklock check path
cmdisklock [-f] reset path
DESCRIPTION
cmdisklock is a tool to check the current state of a Serviceguard cluster lock device. It can also be used to reset the state of the clus-
ter lock device. The need to reset the cluster lock device state could arise if the cluster lock device is replaced or becomes corrupt.
A cluster lock device can be either an HP-UX LVM cluster lock or a cluster lock LUN device. HP-UX LVM cluster locks exist only on a disk
in an LVM volume group. Cluster lock LUNs exist only on disks dedicated to cluster lock. cmdisklock is useful for checking either type of
cluster lock and for re-initializing cluster lock LUN devices after a failure or corruption.
NOTE
To restore an HP-UX LVM cluster lock, use vgcfgrestore. cmdisklock will fail until vgcfgrestore is run, and cmdisklock is unnecessary as
long as vgcfgbackup was done after the cluster lock was initialized. See the Managing Serviceguard manual for details.
The syntax of the path option depends on the type of lock. For HP-UX LVM cluster lock disks, the syntax is VG:PV (for example:
/dev/vglock:/dev/dsk/c0t0d2). For cluster lock LUN disks, the path is the disk device path. For example, /dev/sdd1 (on Linux) or
/dev/dsk/c0t1d2 (on HP-UX).
Options
cmdisklock supports the following options:
check Check the current state of the cluster lock device and report the results.
reset Reset (initialize) the state of the cluster lock device. This operation should only be performed on a cluster lock
LUN device. For HP-UX LVM cluster lock, use vgcfgrestore as documented in the Managing Serviceguard manual. After
performing a reset, a check can be used to verify that the lock is cleared.
EXAMPLES
If the cluster lock LUN device becomes corrupted and the cluster is up, messages like the following will appear in syslog.
Mar 15 12:20:41 usb cmdisklockd[17599]: WARNING: Cluster lock LUN /dev/dsk/c0t1d2 is corrupt: bad label. Until this situation is cor-
rected, a single failure could cause all nodes in the cluster to crash.
Mar 15 12:20:41 usb cmdisklockd[17599]: After ensuring that all active nodes in the cluster have logged this message, run 'cmdisklock reset
/dev/dsk/c0t1d2' to repair
Mar 15 12:20:41 usb cmdisklockd[17599]: Cluster lock disk /dev/dsk/c0t1d2 is inaccessible
Once the above messages appear in syslog on all running nodes, the following command will re-initialize the cluster lock LUN:
ucd:/> cmdisklock reset /dev/dsk/c0t1d2
WARNING: Cluster lock LUN /dev/dsk/c0t1d2 is corrupt: bad label. Until this situation is corrected, a single failure could cause all nodes
in the cluster to crash.
After ensuring that all active nodes in the cluster have logged this message, run 'cmdisklock reset /dev/dsk/c0t1d2' to repair
/dev/dsk/c0t1d2 is inaccessible
Resetting cluster lock device /dev/dsk/c0t1d2
Cluster lock reset completed
/dev/dsk/c0t1d2 is accessible
cleared
After the lock is restored, a message like the following appears in syslog:
Mar 15 12:23:11 usb cmdisklockd[17599]: Cluster lock disk /dev/dsk/c0t1d2 is accessible
WARNINGS
CAUTION
For cluster lock LUN, reset is a potentially destructive operation. While cmdisklock checks for known volume manager and file system use
(overridden by -f), it does not validate that the device to be reset is actually used by any cluster. If -f is used on the wrong device
file, loss of data may result.
CAUTION
Care should be taken when doing a reset when the cluster is active as there is a remote possibility that the cluster will partition right
when this command is run and both nodes could end up thinking they have successfully acquired the lock. To avoid this situation, make sure
cmcld has logged a message in syslog on all running nodes saying the device is inaccessble, before performing a reset. Note that it is
safe to run cmdisklock when the cluster is down.
RETURN VALUE
cmdisklock returns the following values:
0 Successful completion.
1 The disk is inaccessible or is not recognized as a cluster lock.
AUTHOR
cmdisklock was developed by HP.
SEE ALSO cmapplyconf(1m), cmviewcl(1m), vgcfgbackup(1m), vgcfgrestore(1m)
Requires Optional Serviceguard Software cmdisklock(1m)