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IDS Forum

Re: IDS 7.31/SunOS 5.7 ontape restore problem

Posted By: Art Kagel
Date: Wednesday, 6 January 2010, at 3:26 p.m.

In Response To: IDS 7.31/SunOS 5.7 ontape restore problem (MARSHALL HAHN-TAYLOR)

Some older UNIX systems do not actually support tape block sizes larger than
256K though they will accept a larger block size, however, under the hood
the drivers are actually writing 4 256K blocks not one 1024K block. At
restore time, the logical tape subsystem reports the actual block size when
ontape queries it with fstat(), discovers the discrepancy, and aborts. You
would never know if you don't ever test your restores. Try setting
TAPEBLOCK to 256 instead of 1024 and see if that fixes the problem.

Art

Art S. Kagel
AdvanceDataTools (www.advancedatatools.com)
IIUG Board of Directors (art@iiug.org)

See you at the 2010 IIUG Informix Conference
April 25-28, 2010
Overland Park (Kansas City), KS
www.iiug.org/conf

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Oninit, the IIUG, nor any other organization
with which I am associated either explicitly or implicitly. Neither do
those opinions reflect those of other individuals affiliated with any entity
with which I am affiliated nor those of the entities themselves.

On Wed, Jan 6, 2010 at 2:26 PM, MARSHALL HAHN-TAYLOR <
marshall_hahn-taylor@canb.uscourts.gov> 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
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--000e0ce03d0ecc8d14047c84c47a

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