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IDS Forum

RE: IDS 7.31/SunOS 5.7 ontape restore problem

Posted By: LARRY SORENSEN
Date: Wednesday, 6 January 2010, at 4:43 p.m.

In Response To: Re: IDS 7.31/SunOS 5.7 ontape restore problem (JACQUES RENAUT)

Let me recap to make sure I know what you are saying. It looks like your dbspace and chunks for a database were stored on a hard drive that failed, but the Informix instance was installed and configured elsewhere. If that is the case, I am not sure why you added a new dbspace to your instance before the restore. It appears that you are using "cooked" space for your database. I understand the process as follows:

Create the files to be used:

touch mytest_db1
touch mytest_db2
touch mytest_db3

chmod 660 mydb*

Create the symbolic links to the files created above. The symbolic links will look the same name as was used in the database that failed. The only difference is that they point to a different disk now.

ln -s .......

ln -s .......

ln -s .......

mt -f /dev/rmt/0cbn rewind
onmode -yuck
ontape -r

I am assuming that the links to the root dbspace and the temp dbspaces either still exist or that they are using the same space referred to above and everything is together. I am thinking that the error message you received was misleading.

Larry

> To: ids@iiug.org
> From: jrenaut@us.ibm.com
> Subject: Re: IDS 7.31/SunOS 5.7 ontape restore problem [18575]
> Date: Wed, 6 Jan 2010 15:56:35 -0500
>
> You wrote:
> Hello and Happy 2010!
>
> On Xmas eve 2009 one of the disks on a server that I admin went offline,
> taking with it an Informix database that is much missed. First I
> re-initialized the database chunks by executing the following:
>
> touch mytest_db1
> touch mytest_db2
> touch mytest_db3
> chmod 660 mydb*
> onspaces -c -d mytestdb -p /mytest_db1 -o 0 -s 2000000
> onspaces -a mytestdb -p /mytest_db2 -o 0 -s 2000000
> onspaces -a mytestdb -p /mytest_db3 -o 0 -s 2000000
>
> I made sure that the chunk size matched the chunk size of the missing
> chunks (2 GB). I've read some posts on the net that say that one need
> not create the chunks, merely touch the files and set the correct 660
> permissions. I didn't know what to believe, so I made the chunks.
>
> Then I snapped the database symlinks for my missing databases (mytestdb)
> to above newly created chunks. My understanding is that only the symlink
> paths needs to stay the same, not the target to which the links point.
>
> I then attempted cold restoring from the last known good 8mm Exabyte tape
> backup
> for our database.
>
> mt -f /dev/rmt/0cbn rewind
> onmode -yuck
> ontape -r
>
> Archive Tape Information
>
> Tape type: Archive Backup Tape
> Online version: Informix Dynamic Server Version 7.31.UC4
> Archive date: Wed Jun 27 12:31:22 2007
> User id: informix
> Terminal id: /dev/pts/4
> Archive level: 0
> Tape device: /dev/rmt/0cbn
> Tape blocksize (in k): 1024
> Tape size (in k): 138240000
> Tape number in series: 1
>
> Spaces to restore:1 [rootdbs ]
> 2 [livedb ]
> 3 [testdb ]
> 4 [traindb ]
> 5 [llogdbs ]
>
> Archive Information
>
> Informix Dynamic Server Copyright(C) 1986-1998 Informix Software, Inc.
> Initialization Time 10/25/2003 00:28:45
> System Page Size 2048
> Version 6
> Archive CheckPoint Time 06/27/2007 12:31:26
> paces
> number flags fchunk nchunks flags owner name
> 1 1 1 1 N informix rootdbs
> 2 1 2 16 N informix mydb
> 5 1 5 1 N informix llogdbs
> 6 2001 6 1 N T informix tempdb
> 7 2001 7 1 N T informix tempdb2
> 8 2001 26 1 N T informix tempdb3
>
> Chunks
> chk/dbs offset size free bpages flags pathname
> 1 1 0 400000 333479 PO- /dblnk/live/my_root
> 2 2 0 1000000 13 PO- /dblnk/live/my_db1
> 3 3 0 1000000 13 PO- /dblnk/test/mytest_db1
> 4 4 0 1000000 65217 PO- /dblnk/train/mytrain_db1
> 5 5 0 700100 47 PO- /dblnk/llog/my_llogs
> 6 6 0 500000 499497 PO- /dblnk/live/my_temp1
> 7 7 0 500000 499497 PO- /dblnk/live/my_temp2
> 8 2 0 1000000 395348 PO- /dblnk/live/my_db2
> 9 2 0 1000000 15 PO- /dblnk/live/my_db3
> 10 2 0 1000000 3 PO- /dblnk/live/my_db4
> 11 2 0 1000000 59 PO- /dblnk/live/my_db5
> 12 2 0 1000000 8 PO- /dblnk/live/my_db6
> 13 4 0 1000000 869947 PO- /dblnk/train/mytrain_db2
> 14 2 0 1000000 79371 PO- /dblnk/live/my_db7
> 15 2 0 1000000 3 PO- /dblnk/live/my_db8
> 16 2 0 1000000 6 PO- /dblnk/live/my_db9
> 17 2 0 1000000 2711 PO- /dblnk/live/my_db10
> 18 2 0 1000000 550379 PO- /dblnk/live/my_db11
> 19 2 0 1000000 24997 PO- /dblnk/live/my_db12
> 20 2 0 1000000 24997 PO- /dblnk/live/my_db13
> 21 4 0 500000 499997 PO- /dblnk/train/mytrain_db3
> 22 2 0 1000000 399997 PO- /dblnk/live/my_db14
> 23 2 0 1000000 999997 PO- /dblnk/live/my_db15
> 24 2 0 1000000 999997 PO- /dblnk/live/my_db16
> 25 3 0 1000000 11483 PO- /dblnk/test/mytest_db2
> 26 8 0 500000 499497 PO- /dblnk/live/my_temp3
> 27 3 0 1000000 834997 PO- /dblnk/test/mytest_db3
>
> Continue restore? (y/n)y
> Do you want to back up the logs? (y/n)n
> Physical restore failed - restore reserved pages failed
>
> Program over.
>
> When I Googled the above error message, the advice that I read said to
> make sure the TAPE blocksize was set correctly using either mt and/or the
> onconfig file. mt on SunOS 5.7 doesn't support setting the blocksize
> as far as I could determine from it's arcane manpage and the onconfig
> file that ontape uses has the correct blocksize (1024K) and total tape
> size (138,240,000K). Another post I read said to make sure that the
> path to the symlinks that point to the chunks had not changed name.
> I made doubly sure of this.
>
> Any further insights as to what I can do to make this `go' would be
> much appreciated.
>
> TIA,
>
> Marshall
> -----------------------------------------------------------------------------
>
> I think the problem is simply that you are using a no-rewind device. The
> ontape process opens and reads the 1st block to print out the chunks it's
> restoring etc...It then closes the device and reopens it. At that point it is
> expecting to do it's read and reread the block it used to display that
> chunk/dbspace information, and if it's can't, the restore will fail. I think
> if you just do the restore with a rewind device it should work.
>
> Jacques Renaut
> IBM Informix Advanced Support
> APD Team
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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