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Full Discussion: Run process to resynchronize mirrors during database backups?? What does it mean???
Top Forums UNIX for Dummies Questions & Answers Run process to resynchronize mirrors during database backups?? What does it mean??? Post 19615 by thehoghunter on Sunday 14th of April 2002 07:22:13 PM
Old 04-14-2002
When you have a disk mirrored, both copies must be the same. Sometimes, they are not and then you need to synchronize them (usually by running a command to copy one to the other - realize this is not a cp command but is being explained that way)

With Solaris you would be probably using one of two software products - DiskSuite or Veritas. The commands for each are entirely different. Suggest you figure out which you are using and read the manuals.

$ df -kl

If the output has devices that contain /md/ - Disksuite is being used there.
If the output has devices that contain /vx/ - Veritas Volume Manager is being used.

Opinion - DiskSuite for OS drives - Veritas for Data drives. Veritas is a pain in the neck when dealing with OS drives (which is why most don't use it for OS). DiskSuite isn't as robust for Database/Data drives which is why you spend some $$$ and get Veritas. DiskSuite comes with Solaris 2.6 and above. Not sure about below 2.6.

Check out docs.sun.com for on-line docs on DiskSuite.

Check out Veritas Support for on-line docs on Veritas.


For Linux Mirrors check out this link.

For general info on Raid levels

The subject you posted "Run process to resynchronize mirrors during database backups" - was this an error while running backups? If so - is it happening on both Linux & Solaris? What type of backup (data dumps, ufsdumps, vxdumps, 3rd party backup solution {version}). Give more info unless you are just looking for information on Raid.
thehoghunter
 

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LEARN ABOUT CENTOS

mkfs.bfs

MKFS.BFS(8)                                                    System Administration                                                   MKFS.BFS(8)

NAME

       mkfs.bfs - make an SCO bfs filesystem

SYNOPSIS

       mkfs.bfs [options] device [block-count]

DESCRIPTION

       mkfs.bfs creates an SCO bfs filesystem on a block device (usually a disk partition or a file accessed via the loop device).

       The block-count parameter is the desired size of the filesystem, in blocks.  If nothing is specified, the entire partition will be used.

OPTIONS

       -N, --inodes number
              Specify  the  desired  number  of  inodes (at most 512).  If nothing is specified, some default number in the range 48-512 is picked
              depending on the size of the partition.

       -V, --vname label
              Specify the volume label.  I have no idea if/where this is used.

       -F, --fname name
              Specify the filesystem name.  I have no idea if/where this is used.

       -v, --verbose
              Explain what is being done.

       -c     This option is silently ignored.

       -l     This option is silently ignored.

       -h, --help
              Display help text and exit.

       -V, --version
              Display version information and exit.  Option -V only works as --version when it is the only option.

EXIT CODES

       The exit code returned by mkfs.bfs is 0 when all went well, and 1 when something went wrong.

SEE ALSO

       mkfs(8)

AVAILABILITY

       The mkfs.bfs command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux                                                           July 2011                                                         MKFS.BFS(8)
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