help with back up please Post: 8840

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Top Forums UNIX for Advanced & Expert Users help with back up please Post 8840 by Perderabo on Thursday 18th of October 2001 11:19:44 AM

10-18-2001

Administrator Emeritus

We better go back a review filesystems here. When most kernels boot they initialize the system by automatically mounting root and they fire up init and a few other processes. At this point, the only thing mounted is root:
/dev/dsk/c0t0d0s0 1987399 935141 992637 49% /
If you are going into single user mode, it stops here and that is all you see. If you examined /var or /usr you would only have empty directiores since they are not yet mounted. All of the subdirecties and files that we do see are on /dev/dsk/c0t0d0s0.

But we have another disk device called c0t0d0s3 which we can now mount on /var. Once we do that we suddenly see /var/spool spring into existence. But /var/spool is on c0t0d0s3 while /etc/mail is on c0t0d0s0. They may seem to equally situated in some respects, but the difference is important.

Most people also will have a separate /usr filesystem. Looking again, I see that you don't. So I misspoke earlier when I said that you also needed /usr. In your case, you don't. You could possibly configure your system to only have one very large root filesystem...if you did, one ufsdump would do it all.

When you tell ufsdump to save a copy of c0t0d0s0, that is what it does. Sure it will pick up the /var empty directory that root uses as a mount point, but nothing under /var will be there. That's why we need another run of ufsdump to also save a copy of c0t0d0s3.

Perderabo

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LEARN ABOUT OSF1

fdmns

fdmns(4)						     Kernel Interfaces Manual							  fdmns(4)

NAME

       fdmns - contains file domain names and devices

DESCRIPTION

       The  fdmns directory ensures access to file domains by providing symbolic links to every volume in the file domain.  The mkfdmn, rmvol, and
       addvol utilities automatically manage the fdmns directory.  Each file domain is described by its own subdirectory within the  fdmns  direc-
       tory.

       Back  up  the fdmns directory structure regularly using the vdump utility or any other backup utility (dump, tar, cpio). If the contents of
       the fdmns directory are deleted or corrupted, restore the directory from your most recent backup tape.  You must  also  restore	the  fdmns
       directory after installing a new version of the operating system.

       Always  keep  a hardcopy record of each file domain and its associated volumes in case a backup copy of the fdmns directory is unavailable.
       If you have a record, you can reconstruct the fdmns directory structure. The following is a sample fdmns directory:

       total 2 drwxr-x---     2 root	system	  512 Nov 24 18:35 scratch/ drwxr-xr-x	   2 root    system    512 Nov 24 18:35 usr/

	./scratch: total 0 lrwxr-x---	  1 root    system    10 Oct 23 15:13 dsk10c@ ->  /dev/disk/dsk10c  lrwxr-x---	   1  root    system	10
       Oct 24 11:33 dsk11c@ -> /dev/disk/dsk11c lrwxr-x---     1 root	 system     9 Oct 13 18:29 dsk8c@ -> /dev/disk/dsk8c

	./usr:	total  0 lrwxr-x---	1 root	  system     9 Oct 24 10:52 dsk2g@ -> /dev/disk/dsk2c lrwxr-x---     1 root    system	  9 Nov 24
       10:35 dsk9c@ -> /dev/disk/dsk9c

RESTRICTIONS

       Do not remove or modify the contents of this directory.	If the fdmns file becomes corrupted, you can no longer access (or mount) any file-
       set in the file domains.

SEE ALSO

       advfs(4), vdump(8), mkfdmn(8), vrestore(8), showfdmn(8)

																	  fdmns(4)