Re: [Veritas-bu] NetBackup 6.5 index size
2008-03-28 18:27:43
Pre 6.x versions had a formula for estimating
catalog size in the manual. I haven't seen it in the 6.x docs, but I'm
sure it is there somewhere. As Ed stated, the more objects the catalog
has to keep track of, the larger it will be. You also should consider any
duplications you'll be doing, either from dssu's or vault.
Also, if you think your catalog will
be pretty big, I'd recommend getting with a backline engineer to find out
what kind of things to expect if the catalog approaches a certain size.
It would be interesting to find out what the theoretical size limit of
the new database would be.
Rusty Major, MCSE, BCFP, VCS ▪
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"Ed Wilts" <ewilts AT ewilts DOT org>
Sent by: veritas-bu-bounces AT mailman.eng.auburn DOT edu
03/28/2008 10:27 AM
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Subject
| Re: [Veritas-bu] NetBackup 6.5 index
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On Fri, Mar 28, 2008 at 8:03 AM, Dariusz Klar <Dariusz.Klar AT sun DOT com>
wrote:
I know the general rules, but... Another challenge for
me is to estimate
disk space for NetBackup catalog where total amount of data under
NetBackup protection is 3.6 PB (peta bytes) with ability to grow to 8.5
PB in the future.
Yes, size matters. but if that 3.6PB consists of 10k tiff files (and
I would feel your pain!), your catalog would be significantly larger than
if it consists of 100GB Oracle tables.
The difference between 1% and 2% of total amount of protected
data for
catalog does matter. The difference vary from 36 TB to 85 TB in case of
1% difference. I need to be more precise. If I will say to my customer
that they have to buy 255 TB (3% of total amount of data in the future)
for NetBackup catalog, I have to be 100% sure what I'm talking about.
I called Symantec and with that big data volume they are not 100% sure
about space size for NetBackup catalog.
Data volume does not matter - the number of unique filenames does. I
could design the application to put 100 files in 100 directories and end
up with a much larger catalog than if I put those 10,000 files in a single
directory.
If the data is all transitory and your retentions are long, the catalog
will be much larger than if the data was fairly stagnant or retentions
short. My Exchange environment is about 3TB or so and my catalog
for that is about 2.2MB - that's under 0.01%. I have about the same
amount of disk space in an environment that has host-based mirror sets,
longer retentions, more transitory data, and small files. The catalog
for that is 25GB - 1,000 times larger for the same amount of disk space.
Even that is only 0.8% of allocated disk space. I have a 27TB
application that requires 147GB of catalog space - about 0.5% - and it
too has lots of little files.
My total catalog size is under 600GB and we have about a 340GB of allocated
disk space (that's SAN based and doesn't count the servers with local disk
space or volumes that have host-based mirrors). That's about 0.2%
of allocated space, nowhere near the 1-3% that you've been looking at.
Again, how you use and back up your data will have a very significant
impact on your catalog size.
If your customer can tell you exactly how they're going to use the disk
space and what their backup policies and retentions are going to be, then
you can be more accurate in calculating a catalog size. If they can't,
you're not going to have enough information to make a useful prediction.
--
Ed Wilts, Mounds View, MN, USA
mailto:ewilts AT ewilts DOT org
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