Hello, We are testing the trial of Backup Exec 2010 R3 on our primary domain controller running Windows 2008 R2 equipped with HP DAT 320 (internal USB) tapedrive. I have just discovered that I can't fit the usual size of data onto our 160/320GB tape with BE2010 ... the compression ratio is very low, around 1.1:1 and backup task asks for another tape... We use it for last night backup only (everyday, no rotation), mostly for having a fresh backup of server system files along with Active Directory and SQL instances ... production files are replicated to other w2k8 servers and NAS so need to backup everything to this tape. Is there any known problem with BE 2010 R3 inefficiently using media compression on HP DAT 320 tapedrives? asking because before we used a software whcih came with tapedrive, it was HP Data Protector Express 5.0 Basic and I was able to fit much more information to the same 160/320GB media when using that software, now I can't seem to be able to achieve that with BE 2010 R3 ... lastly, is there any way the Symantec BE 2012 beta/trial becomes public anytime soon? I signed up a while ago for it, but it seems so far it is released only to partners and people with current maintenance plans on BE software - we don't have it, we are considering a switch to Symantec for our backup needs ... Thanks.

From the Devices Tab, right click the drive \properties Verify that enable compression is selected. Also read through the manual for the tape drive and see if there is a compression on/off switch on the drive itself You can also download the manufacturer's test utility and do a few runs. (HP has LTT, Library and Tape Tools for example)

Hardware Compression is a feature that is either on or off. Since you are getting SOME compression, it is obviously "on". The compression ratio is determined by the hardware (not much you can do about that) and the source data. Any chance you were backing up different data when you were using the other software that achieved a higher compression ratio? Different data can have dratically different compression ratios.

I made a small research and your driver support hardware compression, so probabily the backup exec is using it, you MAY try using the software compression and see if it gets better, but as Larry said, it depends of the data you´re backing up.

...if you were getting compression on the older drive, have you made sure that the current drive is running with the Symantec drivers? If not, consider installing these. @timgarbim: Please don't paraphrase what other people post before you...

I have just checked the Device driver properties and it says Compression Cabale = TRUE, but another paramtere below it named Compression Enabled says FALSE ... weird ... I haven't changed drivers for this tapedrive when removing the HP DPX5.0 ... it seems that is the reason why Symantec software can't use compression (HW compression is checked in task properties of BE2010R3) ... I have no idea if that driver property was TRUE before I uninstalled HP software, but something is telling me this is the reason why the media compression sits at minimal 1.1:1 ratio (pretty much no compression). wondering what's up with that ... will try re-installing HP tapedrive drivers and see if this switch toggles from False to True (I can't change it myself, option is grayed out, only reporting the state, not allowing to change it).

testing BE 2010 R3 trial on w2k8 R2 (x64), tape compression low

Ken_Putnam
Level 6
13 years ago
From the Devices Tab, right click the drive \properties

Verify that enable compression is selected. Also read through the manual for the tape drive and see if there is a compression on/off switch on the drive itself

You can also download the manufacturer's test utility and do a few runs. (HP has LTT, Library and Tape Tools for example)
Larry_Fine
Level 6
13 years ago
Hardware Compression is a feature that is either on or off. Since you are getting SOME compression, it is obviously "on". The compression ratio is determined by the hardware (not much you can do about that) and the source data. Any chance you were backing up different data when you were using the other software that achieved a higher compression ratio? Different data can have dratically different compression ratios.
timgarbim
Level 4
13 years ago
I made a small research and your driver support hardware compression, so probabily the backup exec is using it, you MAY try using the software compression and see if it gets better, but as Larry said, it depends of the data you´re backing up.
CraigV
Moderator
13 years ago
...if you were getting compression on the older drive, have you made sure that the current drive is running with the Symantec drivers? If not, consider installing these.

@timgarbim: Please don't paraphrase what other people post before you...
6ft_under
Level 3
13 years ago
I have just checked the Device driver properties and it says Compression Cabale = TRUE, but another paramtere below it named Compression Enabled says FALSE ... weird ... I haven't changed drivers for this tapedrive when removing the HP DPX5.0 ... it seems that is the reason why Symantec software can't use compression (HW compression is checked in task properties of BE2010R3) ...

I have no idea if that driver property was TRUE before I uninstalled HP software, but something is telling me this is the reason why the media compression sits at minimal 1.1:1 ratio (pretty much no compression).

wondering what's up with that ...

will try re-installing HP tapedrive drivers and see if this switch toggles from False to True (I can't change it myself, option is grayed out, only reporting the state, not allowing to change it).
6ft_under
Level 3
13 years ago
When using HP software (and their tapedrive drivers) I never had to check anything about comrpession settings, it was just working very well.

Data type is same, only data size could have grown by a little bit (a few GB, new SQL instance was installed, WSUS downloaded some updates, etc.), but it was still fitting 160/320GB media when using HP software. Now I can't fit even 175GB onto the media when using BE2010R3 ...
6ft_under
Level 3
13 years ago
Yup, the drive is definitely capable of compressing the data (up to 2:1 ratio) and that's how it worked by default with HP DPX5.0.

not sure exactly why different vendor's software can't use it, but I need to investigate the driver settings as one driver property says Compresion Capable TRUE, however Compression Enabled property says FALSE - have no idea how it was set before uninstalling HP DPX5.0 though).

Let me check 2 other (older) HP servers with different model HP drives, but they should have similar properties in Device Manager drivers.
6ft_under
Level 3
13 years ago
right, that's another good point. drive is running HP drivers (it's an HP drive), where should I look for Symantec drivers for my HP drive?
6ft_under
Level 3
13 years ago
OK, I have just checked 2 other (Proliant ML350 G4p) servers using older internal SCSI Ultra 320 tapedrives and in fact "Compression Enabled" parameter is set to TRUE on HP DAT72 in that server and also other server running HP Ultrium LTO 400GB has no such parameter in driver properties (but compresion works anyways). Both other servers are using HP Data Protector Express 4.0 SP1 software that came with HP tapedrives ... running under Windows 2008 SP2 x86 .... HP driver setting coincidence or a bug? if a bug than what's cauing it, HP driver or Symantec BE2010 R3 software?

Honestly I smell something fishy about HP here regarding the new Proliant ML350 G6 server and their HP DAT 320 tapedrive ... how come the compression was working great when using HP DPX 5.0 Basic software and after switching to Symantec it doesn't work at all anymore ... would it be possible that HP DPX 5.0 software toggles the compression setting for HP drives upon uninstallation of HP backup software? kinda scary if it was true ... hopefully this is not the case ...

... or the other way around, maybe installing Symantec BE2010 R3 has broken something (software wise) regarding tapedrive compression? I don't see how though, since I re-installed the HP driver and the same compression problem persists.

EDIT:

I have re-installed the latest HP StorageWorks 3.5.0.0 driver for Hp DAT 320 and still I see the "Compression Enabled = FALSE" in tapedriver driver properties ...

Does Symantec have their own driver for this tapedrive? I'd like to try it out, but don't know how or where from.
6ft_under
Level 3
13 years ago
never mind, I think I found how to switch from HP drivers to Symantec ones:

http://www.symantec.com/business/support/index?page=content&id=TECH17931

will give it a shot soon.

EDIT:

:( no go

"Symantec does not supply tape device drivers for USB tape devices.

Device drivers for USB tape devices should be obtained from your device vendor."

back to square one :(

any ideas?