My sentiment is similar to Paul's below. I like to think of it as follows: You
get what you pay for. When my network team gets a project they ask management
how many 9s of service they want. The cost goes up almost exponentially as you
tack 9s onto 99% and many times management isn't willing to foot the bill. In
my current environment our backup system is sometimes 100% utilized and there
is little room for failure. Thankfully our RTOs and RPOs are liberal so losing
a full backup on Friday night isn't a deal killer. An acceptable failure rate
(and how you calculate it) is really up to you. We had this discussion here
and came up with the following:
Do you count multiple Oracle backup sets as one backup or many? One full
backup in Oracle could be 50 backups is Netbackup. 50:1 or 1:1 is going to
effect your percentage.
Do you count failures against your percentage? How about re-runs? Do you
average the two? What happens if the re-run fails too?
Do duplication/incremental jobs count? (Talk about driving up your numbers!)
At the end of the day I judge my effectiveness based on my company's ability to
recover from a disaster and meet our RTO and RPO. If you can meet your RTO and
RPO right now than you are 100% compliant no matter how many individual jobs
may have failed last night. Backup success rate is a nice number to watch, but
ultimately ability to execute is paramount.
-Jonathan
-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Paul
Keating
Sent: Monday, January 07, 2008 10:13 AM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Enterprise Backup Success Rate (Non Technical)
You're lucky your environment is as large as it is.
In my experience, the larger the environment, the better the success rate.
Large environments tend to have more tape drives, more robots, and more budget.
Hence you lose one out of 50 tape drives, you're still likely to have better
than 99% success.
In an environment with 10 drives, you lose one drive, you could lose 5-10%,
depending on how thin your overhead is.
I've supported Netbackup environments with 100 to 2500 backup jobs.
10 failures daily, out of 2500 wasn't uncommon.
That's only about 1/2 of a percent.
You could lose an entire media server and still have over 95% success on a
given night.
In an environment with 100 clients, 2-4 failures is not uncommon......that's a
much bigger hit.
Lose a media server early in your backup window an you could have 0% success on
a given night.
Not to mention, the smaller environments usually have less strict change
control, which means clients are being patched, upgraded, have untested
software installed, have different NIC drivers, etc, etc.
That being said, I'm personally very uncomfortable with backup success rates <
98%.
Paul
--
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Randy
> Samora
> Sent: January 4, 2008 8:15 AM
> To: bobbyrjw AT comcast DOT net; VERITAS-BU AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] Enterprise Backup Success Rate (Non
> Technical)
>
>
> 700+ Windows clients, 2 Masters, 21 Media/SAN Media servers .
> . . if my
> success rate falls below 99%, I lose my quarterly bonus.
>
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