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IDS Forum

Re: IDS 7.31/SunOS 5.7 ontape restore problem

Posted By: adolfo flores
Date: Wednesday, 6 January 2010, at 4:51 p.m.

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

Hi Jacques,

To testing the tape device if it supported a blocksize = 1024k , you can try it command :

mt -f /dev/rmt/0cbn rewind
dd if=/dev/rmt/0cbn bs=1024k count=100 of=/dev/null

It command read 100 block of 1024k each one and send it to /dev/null.

I remenber that in Solaris you can set the parameters of tape with mt -f device set arg=value

Regards

Adolf.

---------[ Received Mail Content ]----------

Subject : Re: IDS 7.31/SunOS 5.7 ontape restore problem [18575]

Date : Wed, 6 Jan 2010 15:56:35 -0500 (EST)

From : "JACQUES RENAUT" <jrenaut@us.ibm.com>

To : ids@iiug.org

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

*******************************************************************************

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