Henry_52 Absent Member.
Absent Member.
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Total backup Size

I checked tape backup size.
When I checked tape size by Devices -> Slots,
It's only 182G.
But When I check tape size by Media -> media_pool, It's 348g. (It's over 200G)
What is real total size and Why this happened ?
Please let me know about this.

Henry

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9 Replies
Kurt Beyers. Absent Member.
Absent Member.

Re: Total backup Size

Henry,

I guess you are using Ultrium 1 tapes with HW compression.

On a Ultrium1 tape, you can write 100 GB native and 200 GB compressed data assuming a compression ratio of 2:1

The compression ratio is only a rule of fist however, the true compression ratio is data dependent and often higher then 3 (you are currently at 3.5:1)

DP will keep on using a tape until the end-of-tape is reached. Then you can see what compression ratio is reached on your data.

best regards,
Kurt
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Henry_52 Absent Member.
Absent Member.

Re: Total backup Size

Hi Kurt,

According to your reply,

Devices -> Slots shows compressed size.
and
Media -> media_pool shows uncompressed size.

Is this right ?
This is key point for me.

Thank you.

Henry

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Scott McIntosh_ Absent Member.
Absent Member.

Re: Total backup Size

What version of the product are you using?
Are you using manager.exe or xomni?
Waht patch level is your GUI (Help->About, internal build)?

Screen shots?

Thanks,
Scott
HP Support
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Henry_52 Absent Member.
Absent Member.

Re: Total backup Size

Scott,

Please check below.
And I don't use manager.exe or xomni.
I use GUI.

Thank you

Henry

Product version A.05.10
Internal build version 209
Built on May 7, 2003 12:01 PM

P.S.) When I check tape size by Devices -> Slots and Media -> media_pool tab,
Some tape size is same and some tape is different.
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Scott McIntosh_ Absent Member.
Absent Member.

Re: Total backup Size

manager.exe is the Windows GUI.
xomni is the UNIX GUI.
So you're using one of the two.

Regardless, you're unpatched. So patch first and then see if a problem persists.

http://wtec.cup.hp.com/~wtec_ss/patches/default.htm

I still don't have a good idea where the two data values you are comparing are found in the GUI. Screenshots.

Thanks,
Scott
HP Support
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Highlighted
Scott McIntosh_ Absent Member.
Absent Member.

Re: Total backup Size

Sorry, you're going to need the customer URL to the patches. 🙂

http://support.openview.hp.com/cpe/patches/dp/dp.jsp

Thanks,
Scott
HP Support
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Henry_52 Absent Member.
Absent Member.

Re: Total backup Size

Scott,

Sorry. I can't do screen shot at this time.
Please check below. what is different between Used blocks and Total blocks ?
usually, It's same but some tapes are different. I think Devices tab shows used blocks and media tab shows Total blocks.

Regards,

Henry

$ omnimm -media_info YF05E3L1 -detail

MediumID : ac100135:3fc95020:5da2:0001
Pool name : um07
Library :
Medium Label : YF05E3L1
Location :
Medium Owner : xxx.yyy.ca
Used blocks : 186295808
Total blocks : 355779200
Number of writes : 2
Number of overwrites : 2
Number of errors : 0
Creation time : Sat Nov 29 21:04:16 2003
Time of last write : Sat Feb 7 16:03:54 2004
Time of last overwrite : Sat Feb 7 16:01:49 2004
Time of last access : Wed Aug 4 13:21:52 2004
Medium type : HASNOCOPY
Write-protected : No

$ omnimm -media_info YF18E3L1 -detail

MediumID : ac100135:40211253:5cef:0001
Pool name : um07
Library :
Medium Label : YF18E3L1
Location :
Medium Owner : xxx.yyy.ca
Used blocks : 306270976
Total blocks : 306270976
Number of writes : 2
Number of overwrites : 1
Number of errors : 0
Creation time : Wed Feb 4 10:40:03 2004
Time of last write : Sat May 8 05:04:57 2004
Time of last overwrite : Sat May 8 05:00:36 2004
Time of last access : Wed Aug 4 13:17:30 2004
Medium type : HASNOCOPY
Write-protected : Yes
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Joseph T. Wycko Absent Member.
Absent Member.

Re: Total backup Size

Aaah, lies, damn lies, and statistics, to quote Mark Twain.

I am not sure if this is your scenario... but in one view you may be looking at a "high water mark" - the maximum amount of data this tape has ever held, and in another view, looking at how much data this tape is currently holding.

Tape Statistics are notorious for this sort of misleading behaviour.
Omniback and NT problems? double check name resolution, DNS/HOSTS...
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Scott McIntosh_ Absent Member.
Absent Member.

Re: Total backup Size

Well, the "blocks" wording seems misleading. You can't know the block size on the medium without doing a TapeAnalyser -header, so the number should be meaningless.

But it appears to be in KB, so maybe "blocks" should have read "KB" instead.

So it looks like you've used 182,000MB out of an anticipated capacity of 347,440MB for the tape.

So at some point in time, you had written almost 340GB to the tape before passing EWEOT (thus we conclude the tape as full).

If this time around, you only get 300GB to the tape before being full, 300GB will become the new Total Blocks value for the medium.

So total capacity, when the medium is not declared full, is a moving target.

Used blocks : 186295808
Total blocks : 355779200

So be sure what you are looking at in the GUI, and remember that you are unpatched, so don't trust things necessarily.

Thanks,
Scott
HP Support
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