Solved

No compression on backup exec 12.5

Posted on 2011-02-16
8
960 Views
Last Modified: 2013-11-14
Hi.  I'm backing up a couple of servers to a backup exec 12.5 server running Server 2008 and using an HP Ultrium 1760 with HP LTO4 tapes.   All running fine until the 7th - it backed up 941GB of data that night.  Since then it's failed consistently.  The tapes show a maximum capacity of 781.5GB, which is no compression at all, isn't it?  Looking at some of the tapes that haven't been used since the 7th, they've reported compression of between 1.4 and 1.9:1, so I'm guessing this is an issue with the drive or the software rather than the media.  Compression's enabled on the drive

drive compression screenshot
 I've tried updating the drivers on the tape but I still can't get the tape to accept more than its uncompressed limits.  Thanks.

 
0
Comment
Question by:SONMDTS
  • 4
  • 4
8 Comments
 
LVL 55

Accepted Solution

by:
andyalder earned 250 total points
ID: 34906342
First thing to do is test the drive using L&TT - http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?lang=en&cc=uk&prodTypeId=12169&prodSeriesId=406729&submit.y=5&submit.x=4&lang=en&cc=uk

Don't forget there's a compression option under the job as well as under the device.
0
 

Author Comment

by:SONMDTS
ID: 34906388
thanks.  the job has compression set:

 Job compression settings.
I'll try that tool, cheers.
0
 

Author Closing Comment

by:SONMDTS
ID: 34914915
Thanks Andy.  Useful tool that.  The drive's faulty and HP are swapping it out.
0
 
LVL 55

Expert Comment

by:andyalder
ID: 34914973
Probably head wear, it gives the impression of no compression or at least not getting enough data on a tape since it re-writes any bad data further down the tape so taking up more room. LTO4s are pretty hard to feed data to fast enough to stop them continually repositioning (shoe-shining) which wears the head out.
0
Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

 

Author Comment

by:SONMDTS
ID: 34916253
that's interesting.  It'll be good to swap it out and see immediately whether I can get the compression back again.  To be honest, even compressing at 1.4:1 I'm not getting enough backed up, so I'm thinking about buying an LTO5 device.  Had a brief think about offsite backup, but it's ludicrously expensive.  thanks for getting back to me andy.
0
 
LVL 55

Expert Comment

by:andyalder
ID: 34916653
Trouble with LTO5 is they're even faster than LTO4, 47-140 MB/s data rate matching meaning that the head should be fed at at least 47MB/s which means about 100MB/s to allow for compression. Can you read your disks at 100MB/s? L&TT has a host test to see if it can.
0
 

Author Comment

by:SONMDTS
ID: 34924113
Hmm.  It's reading/writing at 82 MB/s as per the test.  Is there any way of improving this?  I must get some sort of improvement off an LTO5, even with this issue.  To be honest, even with 1:1 compression, starting at 1.6TB would be enough for a while.  Anything else is just bonus.  Thanks for the followup questions.
0
 
LVL 55

Expert Comment

by:andyalder
ID: 34924550
Only way I know of improving the disk read speed is to buy more of them, we often setup D2D2T with several disks in the staging area to ensure we can feed the tape fast enough.
0

Featured Post

Superior storage. Superior surveillance.

WD Purple drives are built for 24/7, always-on, high-definition security systems. With support for up to 8 hard drives and 32 cameras, WD Purple drives are optimized for surveillance.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

I previously wrote an article addressing the use of UBCD4WIN and SARDU. All are great, but I have always been an advocate of SARDU. Recently it was suggested that I go back and take a look at Easy2Boot in comparison.
Lets start to have a small explanation what is VAAI(vStorage API for Array Integration ) and what are the benefits using it. VAAI is an API framework in VMware that enable some Storage tasks. It first presented in ESXi 4.1, but only after 5.x sup…
This tutorial will walk an individual through the steps necessary to install and configure the Windows Server Backup Utility. Directly connect an external storage device such as a USB drive, or CD\DVD burner: If the device is a USB drive, ensure i…
This tutorial will walk an individual through setting the global and backup job media overwrite and protection periods in Backup Exec 2012. Log onto the Backup Exec Central Administration Server. Examine the services. If all or most of them are stop…

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now