Can shared disk simulation using NBD will be useful in HACMP

10 More Discussions You Might Find Interesting

1. Solaris

Iscsi shared disk - same naming across server

Hi all, Is there anyway i can control the naming of the disk device ? I have added an iscsi disk on server1 using iscsiadm , devfsadm and it is now showing as /dev/dsk/c2t0d0 in node1 However, i am worried that the same disk will appear as /dev/dsk/cXtXd0 in node2 This iscsi disk(lun)...

2. AIX

Shared Disk in VIOS between two LPARs ?

is there any way to create shared virtual disk between two LPARs like how you can do it using Storage through Fiber on two servers ? Trying to stimulate HACMP between two LPARs

3. Programming

Shared library with acces to shared memory.

Hello. I am new to this forum and I would like to ask for advice about low level POSIX programming. I have to implement a POSIX compliant C shared library. A file will have some variables and the shared library will have some functions which need those variables. There is one special...

4. HP-UX

Shared a Disk between two hosts

Hello people. I need to shared a disk between two virtuals hosts in the same Guest, and I don't see any help about this. I'm working on HP-UX 11.31 Thanks to all.:b:

5. AIX

hacmp - is it possible to remove a disk heartbeat network from an online cluster?

Hi I'm a little rusty with HACMP, but wanted to find out if it is possible to remove a disk heartbeat network from a running HACMP cluster. Reason is, I need to migrate all the SAN disk, so the current heartbeat disk will be disappearing. Ideally, I'd like to avoid taking the cluster down to...

6. AIX

HACMP does not start db2 after failover (db2nodes not getting modified by hacmp)

hi, when I do a failover, hacmp always starts db2 but recently it fails to start db2..noticed the issue is db2nodes.cfg is not modified by hacmp and is still showing primary node..manually changed the node name to secondary after which db2 started immediately..unable to figure out why hacmp is...

7. Programming

Simulation using C/C++ and Java

Hi, I'm just start to learning simulate a network protocol using C/C++ and Java from scratch. Actually, I want to make two nodes can communicate using TCP and UDP protocol, for example http connection and video streaming, respectively. Can anyone help me find several references or guidance...

8. AIX

HACMP adding disk for mirroring

Hi all, I have an HACMP (v5.3.0.0) cluster vg attached to ibm shark that need to be decommissioned. The data need to move to the HP EVA disk. The OS is on AIX 5200-10. The plan is to add a new disk from EVA & mirror the existing vg & break the mirror from Shark disk once the mirror finished. ...

9. Programming

Shared memory for shared library

I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability. Obviously, I'll have to worry about mutual exclusion.

10. Programming

Shared memory in shared library

I need to create a shared library to access an in memory DB. The DB is not huge, but big enough to make it cumbersome to carry around in every single process using the shared library. Luckily, it is pretty static information, so I don't need to worry much about synchronizing the data between...

LEARN ABOUT HPUX

prealloc

prealloc(1)						      General Commands Manual						       prealloc(1)

NAME

       prealloc - preallocate disk storage

SYNOPSIS

       name size

DESCRIPTION

       preallocates  at  least size bytes of disk space for an ordinary file name, creating the file if name does not already exist.  The space is
       allocated in an implementation-dependent fashion for fast sequential reads and writes of the file.

       fails and no disk space is allocated if name already exists and is not an ordinary file of zero length, if insufficient space  is  left	on
       disk, or if size exceeds the maximum file size or the file size limit of the process (see ulimit(2)).  The file is zero-filled.

DIAGNOSTICS

       returns one of the following values upon completion:

	      0       Successful completion.
	      1       name already exists and is not an ordinary file of zero length.
	      2       There is insufficient room on the disk.
	      3       size exceeds file size limits.

EXAMPLES

       The following example preallocates 50000 bytes for the file

WARNINGS

       Allocation of file space is highly dependent on current disk usage.  A successful return does not indicate how fragmented the file actually
       might be if the disk is approaching its capacity.

AUTHOR

       was developed by HP.

SEE ALSO

       prealloc(2), ulimit(2).

																       prealloc(1)

AIX