sagar24
asked on
Query regarding ufsrestore and ufsdumo command
Hi Gurus
I am comparitively new to ufsdump and ufsrestore command...
I used command ufsdump to backup / /usr filesystems.
#ufsdump 0f /dev/rmt/0n /
#ufsdump 0f /dev/rmt/0n /usr
The ufsdump was successfully completed..
But When I tried to list the contents of the tape.
#ufsrestore -i
ufsrestore>cd /usr
ufsrestore> ls
/usr:
ls command does not list the the contents of /usr
Pls tell me why ls is not listing ne thing in /usr..
Please guide
Regards
sagar
I am comparitively new to ufsdump and ufsrestore command...
I used command ufsdump to backup / /usr filesystems.
#ufsdump 0f /dev/rmt/0n /
#ufsdump 0f /dev/rmt/0n /usr
The ufsdump was successfully completed..
But When I tried to list the contents of the tape.
#ufsrestore -i
ufsrestore>cd /usr
ufsrestore> ls
/usr:
ls command does not list the the contents of /usr
Pls tell me why ls is not listing ne thing in /usr..
Please guide
Regards
sagar
ASKER
Hi
Sorry for the delayed reply
I would kike to have a few more clarification
1) If my filesystem size is more than the tape capacity,in that case can i use two tapes
Then how do i go about it...
2) If i have partially written tape ..Then if i wanted to append the tape .
then ca i use mt rewind and then mt eom to reach the end od recorded meduim and not end of tape
Sagar
Sorry for the delayed reply
I would kike to have a few more clarification
1) If my filesystem size is more than the tape capacity,in that case can i use two tapes
Then how do i go about it...
2) If i have partially written tape ..Then if i wanted to append the tape .
then ca i use mt rewind and then mt eom to reach the end od recorded meduim and not end of tape
Sagar
1) yes
It is better to work out the data size to ufsdump the filesytems to a tape, it will make
life easier for future restore. (there was an old ufsdump/restore bug in Solaris, might
case problem with multiple tape restore).
If you dump multiple filesystems to a tape, please remember to write down the file
index.
eg:
$ for fs in / /usr /var /export ; do
/usr/sbin/ufsdump 0cf /dev/rmt/0n $fs
done
the tape EOF index (fsf) would be):
0 -- /
1 -- /usr
2 -- /var
3 -- /export
etc
2) If i have partially written tape ..Then if i wanted to append the tape .
Since you are using no-rewind device /dev/rmt/0n
You can sipmle run anothe ufsdump to append the data to the tape, you need to make a note with your tape.
eg:
/usr/sbin/ufsdump 0cf /dev/rmt/0n /
dump the / filesystem to the tape
/usr/sbin/ufsdump 0cf /dev/rmt/0n /usr
append /usr filesystem to the tape
use need to use "mt" command to move aroud with the tape.
It is better to work out the data size to ufsdump the filesytems to a tape, it will make
life easier for future restore. (there was an old ufsdump/restore bug in Solaris, might
case problem with multiple tape restore).
If you dump multiple filesystems to a tape, please remember to write down the file
index.
eg:
$ for fs in / /usr /var /export ; do
/usr/sbin/ufsdump 0cf /dev/rmt/0n $fs
done
the tape EOF index (fsf) would be):
0 -- /
1 -- /usr
2 -- /var
3 -- /export
etc
2) If i have partially written tape ..Then if i wanted to append the tape .
Since you are using no-rewind device /dev/rmt/0n
You can sipmle run anothe ufsdump to append the data to the tape, you need to make a note with your tape.
eg:
/usr/sbin/ufsdump 0cf /dev/rmt/0n /
dump the / filesystem to the tape
/usr/sbin/ufsdump 0cf /dev/rmt/0n /usr
append /usr filesystem to the tape
use need to use "mt" command to move aroud with the tape.
ASKER
Hi
If we conside
EOF
0 -- /
1 -- /usr
2 -- /var
3 -- /export
What will yeild from this two commands below.
#mt -f /dev/rmt/0 -fsf 1
#mt -f /dev/rmt/0n -fsf 1
Note : Actually difference between /dev/rmt/0 and /dev/rmt/0n is understood with ufsdump command but i get confused with other commansds ufsrestore and mt.
2)I had / and /usr filesystems dumped on the tape.
To appned a dir Snv887 i used tar -cvf /dev/rmt/0n Snv887
The command was succesful
But now tar -tvf /dev/rmt/0n and tar -tvf /dev/rmt/0 does not list anything..
Note : Iam increasing the points
Regards
sagar
If we conside
EOF
0 -- /
1 -- /usr
2 -- /var
3 -- /export
What will yeild from this two commands below.
#mt -f /dev/rmt/0 -fsf 1
#mt -f /dev/rmt/0n -fsf 1
Note : Actually difference between /dev/rmt/0 and /dev/rmt/0n is understood with ufsdump command but i get confused with other commansds ufsrestore and mt.
2)I had / and /usr filesystems dumped on the tape.
To appned a dir Snv887 i used tar -cvf /dev/rmt/0n Snv887
The command was succesful
But now tar -tvf /dev/rmt/0n and tar -tvf /dev/rmt/0 does not list anything..
Note : Iam increasing the points
Regards
sagar
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ASKER
Hi yuzh
I am getting confused as I am using both ufsdump and ufsrestore..
1)I have dumped the / on tape using command
ufsdump 0uf /dev/rmt/0n /
Now if use the commands
ufsdump 0uf /dev/rmt/0n rewind
ufsdump ouf /dev/rmt/0n /usr
Dows this operation overwrite previous written / filesystem..
2)Also what is use of the option c
Please answer this query ..
Regards
Sagar
I am getting confused as I am using both ufsdump and ufsrestore..
1)I have dumped the / on tape using command
ufsdump 0uf /dev/rmt/0n /
Now if use the commands
ufsdump 0uf /dev/rmt/0n rewind
ufsdump ouf /dev/rmt/0n /usr
Dows this operation overwrite previous written / filesystem..
2)Also what is use of the option c
Please answer this query ..
Regards
Sagar
1) Please re-read all the previous comments to see if it can help you to understand it.
(You need to learn how to read man page to play with *nix).
"ufsdump 0uf /dev/rmt/0n rewind"
Will try to dump dir/file "rewind" to a tape.
Here's an example of /usr append to / in the tape:
ufsdump 0cf /dev/rmt/0n /
ufsdump 0cf /dev/rmt/0n /usr
Here's an overwriten example:
ufsdump 0cf /dev/rmt/0n /
mt -f /dev/rmt/0n rewind
ufsdump 0cf /dev/rmt/0n /usr
Please keep in mind that tape is a sequential access device!
2) c - "man ufsdump"
c Cartridge.
(You need to learn how to read man page to play with *nix).
"ufsdump 0uf /dev/rmt/0n rewind"
Will try to dump dir/file "rewind" to a tape.
Here's an example of /usr append to / in the tape:
ufsdump 0cf /dev/rmt/0n /
ufsdump 0cf /dev/rmt/0n /usr
Here's an overwriten example:
ufsdump 0cf /dev/rmt/0n /
mt -f /dev/rmt/0n rewind
ufsdump 0cf /dev/rmt/0n /usr
Please keep in mind that tape is a sequential access device!
2) c - "man ufsdump"
c Cartridge.
ASKER
Hi yuzh
I agree that I am not good understanding the man pages..
So I am asking your valuable inputs..
So please do that..
One more thing i would like to ask
#mt -f /dev/rmt/0n eom
#mt -f /dev/rmt/0n stauts
gave me a output
drive type = 52
drive status = 0
sense key error = 0
residue count = 0
file number = 5
block number = 0
Which says I have 5 tape files written (or 5 EOF's).
Now I issued a command
#mt -f /dev/rmt/0n bsf 1
This should now give filenumber=4
But It gives file number=5
Please correct me..
Regards
Sagar Sirdesai
I agree that I am not good understanding the man pages..
So I am asking your valuable inputs..
So please do that..
One more thing i would like to ask
#mt -f /dev/rmt/0n eom
#mt -f /dev/rmt/0n stauts
gave me a output
drive type = 52
drive status = 0
sense key error = 0
residue count = 0
file number = 5
block number = 0
Which says I have 5 tape files written (or 5 EOF's).
Now I issued a command
#mt -f /dev/rmt/0n bsf 1
This should now give filenumber=4
But It gives file number=5
Please correct me..
Regards
Sagar Sirdesai
If you tape position is in the beggining of the tape, run
#mt -f /dev/rmt/0n bsf 1
will not help, it stay in the same position.
The easy way for you to play around with tape, is to maintain a log/index/note about
what you have written to the tape, eg, I use /etc/vfstab as a reference:
when I perform a full system backup I have:
fsf 0-5
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
#
#/dev/dsk/c1d0s2 /dev/rdsk/c1d0s2 /usr ufs 1 yes -
x fd - /dev/fd fd - no -
x /proc - /proc proc - no -
x /dev/dsk/c0t0d0s3 - - swap - no -
0 /dev/dsk/c0t0d0s0 /dev/rdsk/c0t0d0s0 / ufs 1 no -
1 /dev/dsk/c0t0d0s4 /dev/rdsk/c0t0d0s4 /usr ufs 1 no -
2 /dev/dsk/c0t0d0s1 /dev/rdsk/c0t0d0s1 /var ufs 1 no -
3 /dev/dsk/c0t0d0s7 /dev/rdsk/c0t0d0s7 /export ufs 2 yes -
x swap - /tmp tmpfs - yes -
the fsf index tell me the location of each file system in the tape.
eg, if I want to restore /export, I would do:
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
alway rewind and then "fsf x", you shoud be ok.
#mt -f /dev/rmt/0n bsf 1
will not help, it stay in the same position.
The easy way for you to play around with tape, is to maintain a log/index/note about
what you have written to the tape, eg, I use /etc/vfstab as a reference:
when I perform a full system backup I have:
fsf 0-5
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
#
#/dev/dsk/c1d0s2 /dev/rdsk/c1d0s2 /usr ufs 1 yes -
x fd - /dev/fd fd - no -
x /proc - /proc proc - no -
x /dev/dsk/c0t0d0s3 - - swap - no -
0 /dev/dsk/c0t0d0s0 /dev/rdsk/c0t0d0s0 / ufs 1 no -
1 /dev/dsk/c0t0d0s4 /dev/rdsk/c0t0d0s4 /usr ufs 1 no -
2 /dev/dsk/c0t0d0s1 /dev/rdsk/c0t0d0s1 /var ufs 1 no -
3 /dev/dsk/c0t0d0s7 /dev/rdsk/c0t0d0s7 /export ufs 2 yes -
x swap - /tmp tmpfs - yes -
the fsf index tell me the location of each file system in the tape.
eg, if I want to restore /export, I would do:
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
alway rewind and then "fsf x", you shoud be ok.
ASKER
Hi yuzh,
Thanks for your inputs..
But here when I issue
# mt -f /dev/rmt/0n eom
#mt -f /dev/rmt/0n bsf 1
Should'nt it move 1 EOF backwards.
Your earlier made my things very easy ..
This is just to add more to it..
2)With reference to Your example above
if I want to restore /export, I would do:
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
now
I issue
ufsrestore -rf /dev/rmt/0n /export
It will ask me for
Specify next volume #:
Do I specify as 3
Or will it not as only..
Sorry for these numerous questions..
Regards
Sagar
Thanks for your inputs..
But here when I issue
# mt -f /dev/rmt/0n eom
#mt -f /dev/rmt/0n bsf 1
Should'nt it move 1 EOF backwards.
Your earlier made my things very easy ..
This is just to add more to it..
2)With reference to Your example above
if I want to restore /export, I would do:
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
now
I issue
ufsrestore -rf /dev/rmt/0n /export
It will ask me for
Specify next volume #:
Do I specify as 3
Or will it not as only..
Sorry for these numerous questions..
Regards
Sagar
2) You can do:
cd /myrestore-dir
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
ufsrestore -xvf /dev/rmt/0n
PS: No /export as command arg
If you just want to verify what's in the tape, not restore to the HD, you do:
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
ufsrestore -tvf /dev/rmt/0n
Try to remember the following commands:
Dump a filesystem to tape:
# ufsdump 0cf /dev/rmt/0n /dev/dsk/c0txd0sx
Verify what's on the tape:
# ufsrestore tvf /dev/rmt/0n
Restore from tape
# ufsrestore xvf /dev/rmt/0n
Rewind the tape:
# mt -f /dev/rmt/0n rewind
Forward the tape:
# mt -f /dev/rmt/0n fsf x
cd /myrestore-dir
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
ufsrestore -xvf /dev/rmt/0n
PS: No /export as command arg
If you just want to verify what's in the tape, not restore to the HD, you do:
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 3
ufsrestore -tvf /dev/rmt/0n
Try to remember the following commands:
Dump a filesystem to tape:
# ufsdump 0cf /dev/rmt/0n /dev/dsk/c0txd0sx
Verify what's on the tape:
# ufsrestore tvf /dev/rmt/0n
Restore from tape
# ufsrestore xvf /dev/rmt/0n
Rewind the tape:
# mt -f /dev/rmt/0n rewind
Forward the tape:
# mt -f /dev/rmt/0n fsf x
ASKER
Hi Yuzh
Thanks for your inputs ..
One Last Clarification after I am sure to be good with ufsdump and ufsrestore.
I perform the following commands
#ufsdump -0uf /dev/rmt/0n /
#ufsdump -0uf /dev/rmt/0n /usr
#ufsdump -0uf /dev/rmt/0n /export.
#ufsdump -0uf /dev/rmt/0n /export1
Please ..tell me when to use the r ,R and x option .....
Also how does h option plays a role.
Regards
Sagar Sirdesai
Thanks for your inputs ..
One Last Clarification after I am sure to be good with ufsdump and ufsrestore.
I perform the following commands
#ufsdump -0uf /dev/rmt/0n /
#ufsdump -0uf /dev/rmt/0n /usr
#ufsdump -0uf /dev/rmt/0n /export.
#ufsdump -0uf /dev/rmt/0n /export1
Please ..tell me when to use the r ,R and x option .....
Also how does h option plays a role.
Regards
Sagar Sirdesai
man ufsrestore:
r Recursive. Restore the entire contents of the
media into the current directory (which should be
the top-level of the file system). To completely
restore a file system, use this function letter to
restore the level 0 dump, and again for each
incremental dump. Although, this function letter
is intended for a complete restore onto a clear
file system, if the file system contains files not
on the media, they are preserved.
R Resume restoring. ufsrestore requests a particu-
lar volume of a multi-volume set from which to
resume a full restore (see the r function letter
above). This allows ufsrestore to start from a
checkpoint when it is interrupted in the middle of
a full restore.
h Extract or list the actual directory, rather than
the files that it references. This prevents
hierarchical restoration of complete subtrees from
the tape.
In most case, when you want to restore a filesystem from tape back to the HD, you
can safely do:
cd /dir-to restore
ufsrestore -rf /dev/rmt/0n
or
ufsrestore -xvf /dev/rmt/0n
eg:
if you want to restore /usr from tape to /dev/rdsk/c0t0d0s4, you do:
boot up to single usr mode from CD or boot server
newfs /dev/rdsk/c0t0d0s4 #get rid of everything in /dev/rdsk/c0t0d0s4
mount /dev/rdsk/c0t0d0s4 /mnt
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 1
cd /mnt
ufsrestore -rf /dev/rmt/0n
rm restoresymtable
That's it.
r Recursive. Restore the entire contents of the
media into the current directory (which should be
the top-level of the file system). To completely
restore a file system, use this function letter to
restore the level 0 dump, and again for each
incremental dump. Although, this function letter
is intended for a complete restore onto a clear
file system, if the file system contains files not
on the media, they are preserved.
R Resume restoring. ufsrestore requests a particu-
lar volume of a multi-volume set from which to
resume a full restore (see the r function letter
above). This allows ufsrestore to start from a
checkpoint when it is interrupted in the middle of
a full restore.
h Extract or list the actual directory, rather than
the files that it references. This prevents
hierarchical restoration of complete subtrees from
the tape.
In most case, when you want to restore a filesystem from tape back to the HD, you
can safely do:
cd /dir-to restore
ufsrestore -rf /dev/rmt/0n
or
ufsrestore -xvf /dev/rmt/0n
eg:
if you want to restore /usr from tape to /dev/rdsk/c0t0d0s4, you do:
boot up to single usr mode from CD or boot server
newfs /dev/rdsk/c0t0d0s4 #get rid of everything in /dev/rdsk/c0t0d0s4
mount /dev/rdsk/c0t0d0s4 /mnt
mt -f /dev/rmt/0n rewind
mt -f /dev/rmt/0n fsf 1
cd /mnt
ufsrestore -rf /dev/rmt/0n
rm restoresymtable
That's it.
ASKER
Thanks A LOT YUZH..
Regards
Sagar Sirdesai
Regards
Sagar Sirdesai
You are welcome!
mt -f /dev/rmt/0n rewind
to rewind the tape
then do:
ufsrestore tvf /dev/rmt/0n
to verify what's on the tape.
you can also use:
mt -f /dev/rmt/0n fsf x
to forward the tape space over x count of EOF marks.
man mt
man ufsrestore
man ufsdump
to learn more details.