Solved

LTO4 performance Dell LT2000 with Backup Exec 12.5

Posted on 2009-07-04
4
2,684 Views
Last Modified: 2013-12-01
We recently purchased a new backup library a Dell Powervault TL2000 with 2 LTO4 SAS drives.  
The unit is connected to a new server running Windows 2003 R2 with SP2, Quad core with 4GB ram with a Dell Dual Sas Card.  
The library has two IBM drives in it and I have setup Backup Exec 12.5 and we are using the drivers from IBM and not Symantec.  I was using the symentc drives but read that the IBM drivers would perform better, So far I have not seen and difference.

My speeds that Im seeing for LTO4 are not that much better then what we saw with LTO2.  Im running backups through the Network and for LTO4 Im getting about 2000MB/min.
I also have two network cards connected to be ISCSI Vlan using Multipath and backing up using Off Host backups on one of our Equallogics volumes and only getting 2900MB/min.



Questions
What type of speeds should I see through the network with LTO4?
Do I need to make any tweaks to the Buffer size or block size to get better performance?  If so do I just change it in backup exec or do need to do extra steps(Format tapes, driver change etc&)?
Are they any logs I shoudl look at to see if somethng is miconfigured or causing issues.
0
Comment
Question by:DLIExperts
  • 2
  • 2
4 Comments
 
LVL 14

Accepted Solution

by:
Hedley Phillips earned 500 total points
ID: 24777248
The values you mention are pretty typical. LTO4 can itself attain much higher speeds and supposedly the LTO4 is capable of 432GB per hour which is 7.2GB per minute but you will find that the main bottleneck is reading from the disk. Lots of small files will slow things down considerably.

Also the typical file types found on servers these days are not highly compressible and the stated LTO4 drive specs are for 2:1 compression, basically a marketing statement.

BUE 12 onwards is able to write bigger block sizes (up to 11d the max was 64K) and LTO4 tapes really need 250K blocks.

We for example use a piece of software that creates millions of tiny files and our backups are way off the stated top speed. we spent a lot of time testing and found that we could easily treble the speeds when backing up large blocks of data.
0
 

Author Comment

by:DLIExperts
ID: 24777285
How do I increase the block size.  Do o need to do anything with my tapes?
0
 
LVL 14

Assisted Solution

by:Hedley Phillips
Hedley Phillips earned 500 total points
ID: 24777657
The closest tech note I can find is:

http://seer.entsupport.symantec.com/docs/244652.htm

It details how to check if you need to change the block size using the bptm log first.
0
 

Author Closing Comment

by:DLIExperts
ID: 31599766
Implemented LTO4
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

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

Are you looking to recover an email message or a contact you just deleted mistakenly? Or you are searching for a contact that you erased from your MS Outlook ‘Contacts’ folder and now realized that it was important.
The Delta outage: 650 cancelled flights, more than 1200 delayed flights, thousands of frustrated customers, tens of millions of dollars in damages – plus untold reputational damage to one of the world’s most trusted airlines. All due to a catastroph…
This tutorial will walk an individual through the process of installing the necessary services and then configuring a Windows Server 2012 system as an iSCSI target. To install the necessary roles, go to Server Manager, and select Add Roles and Featu…
This tutorial will show how to configure a single USB drive with a separate folder for each day of the week. This will allow each of the backups to be kept separate preventing the previous day’s backup from being overwritten. The USB drive must be s…

813 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

14 Experts available now in Live!

Get 1:1 Help Now