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Sure Store 24e only 12 GB

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Ingo Kaiser
Occasional Advisor

Sure Store 24e only 12 GB

I own a Sure Store 24e.

Backing up my System with the Windows Backup Programm, Tapes store only about 12,7 GB Data.
How to manage to get the whole 24 GB on a Tape?
Or is this normal?
Why is it named 24e?

Thanks for answers

P.S: Hardware Kompression is activated!
14 REPLIES
Eugeny Brychkov
Honored Contributor

Re: Sure Store 24e only 12 GB

Please note that you should activate compression only at one of: device (hardware compression) or in software. In addition, if you backing up already compressed data it will not be compressed any more and may cause even overhead (larger written data).
Native (with no compression, ratio 1:1) you have 12GB, but if assuming compression ratio is 2:1 then you have 24GB.
So if you have 12GB written this only means that data can not be compressed with ratio 2:1
Eugeny
Ingo Kaiser
Occasional Advisor

Re: Sure Store 24e only 12 GB

Thank you for your answer, but only hardware compression is activated and I'm backing up data which is not already compressed (Compressing will be possible, for example with winzip its possible to compress the most of the data highly)
But the data is not compressed and I'm backing up the whole system. If no compression of 2:1 is possible also it has to be more then 12 GB, or?
Marino Meloni_1
Honored Contributor

Re: Sure Store 24e only 12 GB

You can run a test with L&TT called conpression tes, this will write some well known data and check the compression ration reached.
If the result give you 2.1, them hardware compression is working on the dat.
What you reach then could be due or:
-uncompressable data (like mp3, jpg, mpg...)
-bad quality tape (you should found in diagnostic some errors logged)
- dat not in streaming mode, them space is lost, (you can see this in L&TT also)
-all or combinations of above causes

bye

marino
Ingo Kaiser
Occasional Advisor

Re: Sure Store 24e only 12 GB

Thank you very much, I'll try L&TT!
Is it possible to fix such problems using L&TT?
Is there any other possibiltiy if L&TT doesn't fix the problem?
Marino Meloni_1
Honored Contributor

Re: Sure Store 24e only 12 GB

L&TT didnt fix the problem but can give some infos
Lena Starbird
Occasional Contributor

Re: Sure Store 24e only 12 GB

I have a customer that is using the same drive & isn't getting more than about 13GB on a tape with hardware compression. I saw another forum session that stated if you're getting 1:1.3, you're doing good. I get better compression with my software. Anyone have pros & cons to using software over hardware compression? Also, does anyone know the dips switch settings to enable/disable compression on this device?

Thanks!
Ingo Kaiser
Occasional Advisor

Re: Sure Store 24e only 12 GB

I've tested with L&TT, everything went fine, but can't find anything about compression!
What I'm doing wrong?

And so on I've got the same questions as Lena.

Thank you all!
Marino Meloni_1
Honored Contributor
Solution

Re: Sure Store 24e only 12 GB

in the L&TT there is a test called compression test, this will write on your tape and give you at the end a ratio, a normal ration for this known data is 2.1/1,
you can run also the media validation test which will check if you tape is good or poor.
if you generate a support ticket, loking in the errors logged you can check if you had in the past read/write problems.
if everithing is ok, then you can try to disable the hardware compression and try to use software compression.
in order to do this , you have to move some jumper on the DAT itself:

dip 1 /dip 2 / Data Compression /Controll Compression
ON / ON / ENABLE / HOST CONTROL
ON /OFF / ENABLE /NO HOST CONTROL
OFF/ ON / DISABLE/ HOST CONTROL
OFF/ OFF/ DISABLE/NO HOST CONTROL

put the dip 1 and to in off
Ingo Kaiser
Occasional Advisor

Re: Sure Store 24e only 12 GB

Thats a fantastic answer!

Sorry, for a little more question.

Which L&TT version do you use? I didn't find the compression test in version ltt_27_eur2.exe!

And my Sure Store is external, i have to open the drive?

Thank you very much!
Eugeny Brychkov
Honored Contributor

Re: Sure Store 24e only 12 GB

LTT is here http://www.hp.com/cposupport/information_storage/support_doc/lpg50128.html ver.2.9.
To check switches turn drive upside down and you'll see hole with switches
Eugeny
Ingo Kaiser
Occasional Advisor

Re: Sure Store 24e only 12 GB

Hi Eugeny,

so far so good, but little problem, if I turn drive upside down there are no switches!?

Are there differend types of Sure Store 24e?

Where are the switches in my case?

Ingo

Eugeny Brychkov
Honored Contributor

Re: Sure Store 24e only 12 GB

oops... unfortunately I can not check it right now because have no drive... Anyway, DAT drive has switches at its bottom, so if you do not see a hole in the 24e "box" which allows you to access these dip-switches this only means that you need to open case, take away drive and only then you'll be able to access switches
As I know HP ships drives with hw compression turned on
Eugeny
Marino Meloni_1
Honored Contributor
Dave_58
Occasional Visitor

Re: Sure Store 24e only 12 GB

Can't find anything on the DAT24 about jumpers or switches to change the compression; just jumpers for SCSI, think the info is for other than DAT24 model.

The User Guide mentions that some software can disable the HW compression. Very nice info from HP, would like some more detail on that ...

Dave Harper