Rgdg the backup

[Dinesh_15]

Hi Gurus

I need some info regarding the devices used for backup

1) /dev/rmt/0m, 0mn, 1mn,--
What is the effect of using the above device for the following abckup utilities
fbackup
tar
make_tape_recovery
pax
Why not no rewind device i.e 1mn or 0mn is used for fbackup??
Why only 1mn or 0mn is used in ignite backup??

2. If ignite backup is taken including all the VGs , is it sufficient to restore the system working condition in case of failure. I agree that ignite backup should include only VG00.. But still aquery.
I use following command for ignite backup
make_tape_recover -AI -a /dev/rmt/0mn -x inc_entire=vg00 -x inc_entire=vg01.
Anything else to be added on this

3) Can fbackup be used to take backup thru network i.e development srever backup i want to take thru the production server. I am using the ultreme drive for backup

Rgds
DInu

[Michael Tully · Accepted solution]

The use of the no-rewind device is for appending to the same tape. Meaning backup1 backup2 etc

fbackup does not support appending to the same tape, so therefore a non-rewind device is not used.

tar does, make_tape_recovery, cpio and pax do.

You can include the entire system, BUT you should only do this when the system is quite small. The command your using should be fine. I would consider using a different tool for the additional VG's.

Yes you can direct an fbackup to another server, but it must be a HP server. fbackup is a HP proprietry piece of software. Do a search on "remote fbackup" you should find what you need.

[Sridhar Bhaskarla]

Hi Dinesh,

1. For ignite , there will be atleast two passes while creating the image. First pass is to write the boot area using dd and the next part is to store the archive. Since the first pass uses dd to create the bootarea, you don't want the tape to be rewound after the dd command. This is the reason why, when you want to recover files from the ignite tape, you forward the tape by 1 tape block to bypass the boot area and then read the contents. This is not the case with fbackup.

2. There is absolutely no need to include other VGs as they can be very easily imported once vg00 is restored. Adding other VGs not only add more time but also will overwrite the latest data.

3. Yes. All you have to is to enable '.rhosts' and allow production server to access the development server as root. Make sure 'remsh/rlogin' works first and then simply run

fbackup -v -f development:/dev/rmt/0m -g

etc.,

-Sri

[Dinesh_15]

Hi Micheal and Sri

Thanks for the fine tuned answer.. this is what i was expecting ..

One more query.. I think after using the dd for writing the boot blocks in case of ignite ,which backup utility does it use for the remaining VG backup.
How can I restore a perticular file if the backup is taken thru ignite one without igniting.. If once the tape media is forwarded is it necessary to rewind the same before using for igniting the corrupted system

Again .. seeems to be silly but .. please bear with me.
One of my colleage told that there will be diffrence in time taken for the backupjob to complete if the backup is fired from terminal console and PC using the terminal emulation software..He is telling that terminal uses RS232 where as PC uses TCP ..Is it so..???
why

Please answer

Rgds
Dinu

[Darren Prior]

Hi Dinu,

To answer the 2nd part of your latest query; it sounds like your colleague has got a little confused. It is true that the console is using RS232, and the PC could be using TCP (or indeed RS232 if you had a serial connection to a mux.) However, the terminal is a dumb device, it is only displaying information rather than performing any of the processing.

regards,

Darren.

[Dinesh_15]

Hi Darren

You mean to say that there is absolutely no time difference ...

Thanks

can anybody give me some info for the query as posted earlier..
I am posting the same again

I think after using the dd for writing the boot blocks in case of ignite ,which backup utility does it use for the remaining VG backup.
How can I restore a perticular file if the backup is taken thru ignite one without igniting..
If once the tape media is forwarded is it necessary to rewind the same before using for igniting the corrupted system..Why


Rgds
Dinu

[Darren Prior]

Hi Dinu,

The data that's being sent to your terminal screen will be buffered; I really don't think you will notice a difference between the 2 connections.

regards,

Darren.

[Dinesh_15]

Hi Darren

thanks again

can anybody give me some info for the query as posted earlier..
I am posting the same again

I think after using the dd for writing the boot blocks in case of ignite ,which backup utility does it use for the remaining VG backup.
How can I restore a perticular file if the backup is taken thru ignite one without igniting the system i.e which utility
If once the tape media is forwarded is it necessary to rewind the same before using for igniting the corrupted system..Why

Rgds
Dinu

[Pete Randall]

Dinu,

After Ignite writes the boot blocks, the rest of the data is written with pax.


Pete

[Dinesh_15]

Hi Pete

Thanks


Let me to close this thread

Rgds
Dinu