I think there is two or more issues, backing up the data using DDR type
backup only gives you full backup. therefore you need to install/get
software package to do you back.
The problems are:
- Many linux server where password changes, many other thing get
installed on that servers.
- Your not the ADMIN in control of those servers.
- not all servers are the same. and many others...
If you are lucky, only have few hours to do your backup, Sunday from
2am-5am.
z/VM we perform the clone, is the same as cratering a golden image or
install linux from a network. The problem is keep track all the
installed software and what was changed
on those servers... /etc/passwd
. If you lost you "/usr"... the backup you did was just waste of time
-- you need to boot from "recovery disk", chroot .
. May be DDR type backup is the best
.. Boot linux from a "recovery system(disk)" and mount that filesystem(s)
to correct the problem -- if need, run the restore.
I know there is a shop(s) that do there install from a "one servers",
all ADMINs uses(go thru) that servers to install, config... etc to
address this issue .
it seems if there is good maintenance procedures then recovery is less
pain.
"McKown, John"
<[EMAIL PROTECTED]
thmarkets.com> To
Sent by: Linux LINUX-390@VM.MARIST.EDU
on 390 Port cc
<[EMAIL PROTECTED]
IST.EDU> Subject
Re: Backup and Restore Strategies
For Z/Linux
06/29/2007
11:14 AM
Please respond to
Linux on 390 Port
<[EMAIL PROTECTED]
IST.EDU>
> -----Original Message-----
> From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On
> Behalf Of Paul Noble
> Sent: Friday, June 29, 2007 10:01 AM
> To: LINUX-390@VM.MARIST.EDU
> Subject: Re: Backup and Restore Strategies For Z/Linux
>
>
> So, if I'm understanding this correctly, taking a backup of a
> running Linux system from another LPAR gives you, at best, an
> unreliable backup.
That's certainly how I read it.
>
> That means that there are only two viable alternatives:
>
> Shut down Linux and do the backup from another LPAR or,
Yes. The plus is that you can then restore your Linux environment the
same way that you restore the z/OS or z/VM environment. Also, you can
manage your tapes using your standard tape management software (which
doesn't exist at all on Linux, as I understand it). The minus is
unavailability of the Linux system during this time (which is shorted by
some sort of "snap shot", if you have that capability) and well as it
being an "all or nothing" DASD level backup / restore, which is not
useful for restoring individual files.
>
> Use a backup client that runs within Linux and therefore
> participates in its file system processing, getting all the
> current and correct data for the backup.
Correct. But, again, Linux does not interface to the "normal" tape
management systems used by other System z operating systems.
>
> Is that about it?
>
> The problem, as I see it, with backing up from another LPAR
> is that there is no incremental or differential backup
> capability. Nor is there any selective restore capability.
> Its an all-or-nothing backup/restore.
Yea.
>
> Paul Noble
> Cuyahoga County Information Service Center
--
John McKown
Senior Systems Programmer
HealthMarkets
Keeping the Promise of Affordable Coverage
Administrative Services Group
Information Technology
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