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Full Discussion: SDS and replicas
Top Forums UNIX for Advanced & Expert Users SDS and replicas Post 25347 by RTM on Monday 29th of July 2002 10:16:56 AM
Old 07-29-2002
The metadb command is used to administer the replica database - the replica database is used by the software to know where everything is (a simple explanation).

metadb - create and delete replicas of the metadevice state

You should read the documentation on setting up the replica database and other components - Normally you can find it on-line at docs.sun.com but I could not reach it to add the specific link.

Is it necessary to add two replicas on the same slice on the new disks, as made before on the others disks ?
If you have replicas already (before attempting to set up the stripe) then that is all you need as long as you followed the 'rules' for setting up replicas. You don't need more replicas just because you are setting up a new volume/mirror/stripe.

Is it necessary to add the -f option to add replicas ?
No, as mentioned in the man page:
-f The -f option is used to create the initial state data-
base. It is also used to force the deletion of replicas
below the minimum of two. (The -a and -f options should
be used together only when no state databases exist.)

Is it necessary to reboot after creating replicas ?
I could not find an answer on this (and don't have a system to test it on). When creating the replica (while building a system) a reboot is done because we create mirrors of the OS. I believe that a reboot IS needed when first setting up, but not afterwards (if you added more replicas).

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GFRM(1) 																   GFRM(1)

gfrm - remove Gfarm files, directories, or file replicas SYNOPSIS
gfrm [ -frRnqv ] [ -I file-section ] [ -h filesystem-node ] [ -D domain-name ] [ -H hostfile ] [ -N num-of-replicas ] [ -j num-of-threads ] gfarm-URL ... DESCRIPTION
gfrm removes each specified file. It does not remove directories unless the -r or -R option is specified. '.' or '..' cannot be removed. When the -I option is specified, gfrm removes the specified file section. File section is an architecture name for executable files, or a fragment index for a regular file. With the -h, -D, or -H option, gfrm removes file replicas of each specified file or file section on the specified filesystem node(s). All file replicas of a file cannot be removed, unless the -f option is specified. OPTIONS
-f Even when all file replicas are specified by the -h, -D, or -H option, forcibly deletes all the file replica. In this case, the specified file will be deleted. -j num-of-threads Specifies the number of threads to delete file replicas simultaneously. This option is only available when gfrm is compiled by an OpenMP C compiler. -n Prints file names to be deleted, but does not delete them. -q Does not print any verbose message. -r, -R Removes all entries under the directories specified by the command-line argument recursively. -v Prints verbose messages. -h filesystem-node Specifies a filesystem node from which file replicas will be removed. With the -I option, a file replica of the specified file sec- tion will be removed. -D domain-name Specifies a domain name of filesystem nodes on which file replicas will be removed. With the -I option, a file replica of the spec- ified file section will be removed. -H hostfile Specifies a hostfile that lists filesystem nodes on which file replicas will be removed. With the -I option, a file replica of the specified file section will be removed. if ``-'' is specified, standard input is used to read the host list. -I file-section Specifies the file section to be removed. File section is an architecture name, such as sparc-sun-solaris8, for executable files, and a fragment index for regular files. -N num-of-replicas Specifies the maximum number of file replicas. If files has more number of file replicas than specified, reduce the number of file replicas. -? Displays a list of command options. Gfarm 13 November 2006 GFRM(1)

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