- Community Home
- >
- Storage
- >
- Data Protection and Retention
- >
- StoreEver Tape Storage
- >
- Compaq DAT 20/40
Categories
Company
Local Language
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Community
Resources
Forums
Blogs
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-05-2003 11:16 AM
тАО06-05-2003 11:16 AM
Device: Compaq DAT 20/40 SDT-10000
I got the HP L&TT app and I've went through all the test and everything seems to check out ok.. Well, my whole purpose of downloading that app was to test the compression.. because like the 187 posts I read before typing this, I understand what the compression should be, and I know what it's not..
Problem: Inside the app I only have 5 choices.. Analysis, Connectivity, Media Validation, Read/Write, Self Test.. I look in the Scripts folder and I see the "Compression Test" file, but how come it doesn't show up inside the app??!?! arrrgg..
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-05-2003 11:50 PM
тАО06-05-2003 11:50 PM
Re: Compaq DAT 20/40
The L&TT application has originally been written with the firmware of the HP Dat40's in mind; not the pre-merge compaq dat 20/40 and it's firmware (inclusion is being worked on) - this is why you can see all at this point compatible tests in the pull down menu - if you go from within L&TT via "options" to "scripts" and it does display the script; you should be able to run it providing the unit has the latest fw and the L&TT version is the latest too.
( www.hp.com/support/tapetools/ )
Besides that you can actually check out what kind of compression you do get, by checking the job-logs of most major backup sw programs.
more info about compression and performance....
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50244
http://www.hp.com/cgi-bin/cposupport/get_doc.pl?SNI=hpsurestor18545&LC=information_storage&Tfile=lpg50167
http://www.hp.com/cposupport/information_storage/support_doc/lpg50460.html
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-06-2003 05:20 AM
тАО06-06-2003 05:20 AM
Re: Compaq DAT 20/40
Anymore ideas?
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-07-2003 03:08 AM
тАО06-07-2003 03:08 AM
Re: Compaq DAT 20/40
If this appear after migration to w2k,and if the server is using a Adaaptec HBA, update your SCSI drivers, the first released ones with W2K had some trouble with domain validation and some time the negotiate at 5 MB/S async mode.
another tes is following the 3 link suggested, and to use the tools described, they are very usefulls in order to troubleshoot this kind of issue
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-09-2003 12:54 AM
тАО06-09-2003 12:54 AM
Re: Compaq DAT 20/40
I would echo Marino's comments. If you are acheiving 22GB on a 20GB native tape, compression is working fine and your issue is preformance. The win2K original adaptec driver feature is a good candidate. As Marino says the set of performance tools HP provide on the links above are excellent at pinpointing where the issue might lie.
Cheers,
Dave Dewar.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-10-2003 09:34 AM
тАО06-10-2003 09:34 AM
Re: Compaq DAT 20/40
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-12-2003 12:29 AM
тАО06-12-2003 12:29 AM
Re: Compaq DAT 20/40
If you do really have 10 identical Arcserve sessions backing up to the single tape drive then that would slug your performance as well and is obviously not right. I have no diea what type of system you are running on but this would result in a processor and disk load and could mean that the actual tape drive is not getting data as fast as it would like.
I am making the assumption that you only want to backup 3.5GB of data - one backup job. Check you Arcserve scheduling and backup options.
The tape you are using might be called a 40GB tape, but that refers to its capacity at 2:1 compression. The native capacity of a DDS4/DAT40 tape is 20GB.
Cheers,
Dave Dewar
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-12-2003 05:45 AM
тАО06-12-2003 05:45 AM
Re: Compaq DAT 20/40
So, who's the genious that's gonna tell me how to test my compression? I have the hp L&TT tools.. but I don't have a compression test and it doesn't appear under available scripts to run.. hhmmm
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-12-2003 07:41 AM
тАО06-12-2003 07:41 AM
Re: Compaq DAT 20/40
The final link that Tina posted goes to a performance trouble shooting guide.
http://www.hp.com/cposupport/information_storage/support_doc/lpg50460.html
There are also set of tools we have provided to allow you to debug performance issues using the guide. These are available under support/drivers. The explains how to use these tools.
try this link for the tools:
http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?pnameOID=18547&locale=en_US&taskId=135&prodTypeId=12169&prodSeriesId=81997&submit.y=6&submit.x=8&cc=us#Microsoft%20Windows%20Server%202003
These should work for the compaq dat40 drive you have as well, although I am not sure whether we have actually tested it :-).
One of the tools is called HPcreatedata. This allows you to create data files of different compression ratios. You can then use the other tools to send them to the drive and measure performance.
Read the performance troubleshooting guide and try the tools.
Cheers,
Dave Dewar.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО06-12-2003 11:52 AM
тАО06-12-2003 11:52 AM