Azure? Cloud?
There is no cloud. It is just someone else's computer. ;-)
--
Radoslaw Skorupka
Lodz, Poland
W dniu 08.07.2020 o 17:46, Joe Monk pisze:
I do a backup to spinning storage, then a copy of that backup to Azure for
long term.
Joe
On Wed, Jul 8, 2020 at 10:12 AM Seymour J Metz <sme...@gmu.edu> wrote:
I've always gone with dual* backups, with one copy off site. Remote
mirroring is a good option where policy permits, and even if retensioning
is no longer relevant, rereading backups periodically will give you a heads
up if one copy goes south. I would consider even correctable errors to be
red flags.
Any medium you use will have failure modes.
Multiple PiT recovery is good for "whoops!" moments and possibly for
audits.
Large or small, each shop must do it's own risk assessments in the context
of its own obligations and priorities.
* Depending on the value of the data, you might want more than 2.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf
of Bill Ogden [og...@us.ibm.com]
Sent: Wednesday, July 8, 2020 9:27 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Storage & tape question
Probably many others will chime in on this. I have lost RAID 5 arrays with
two disk failures within an hour of each other. RAID is nice, but one must
allow for failures.
Long ago I was involved with reading archived tapes and transferring the
data to CDs. The programs involved were home-written and the project ended
up going nowhere. However, we discovered that tapes kept too long started
having errors. (At that point, for the CD copy, we just logged the error
and accepted the corrupt data; what else could we do?) How long is "too
long"?? It was variable, but measured in a few years. The advice then was
to minimally read the tapes every year or so to "retension" them. Don't
know if this would apply to more modern tape media. (We also discovered
that locally "burned" CDs are not expected last forever.)
IMHO, the key point for tape backups are (1) off-site storage, (2)
multiple PiT recovery, (3) logical error recovery. All this can be done
with disk-only environments involving remote copy and lots of disk space,
but all that becomes expensive for smaller shops.
Bill Ogden
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