What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI
Course Of The Month
Become a Premium Member and unlock a new, free course in leading technologies each month.
Solved
Arcserve backup gradually slowing down
Posted on 2012-12-20
Hello, I have an Arcserve backup job that runs every night. The job takes around 11hrs to backup 640Gb of data.
The backup starts at around 4,000Mb/min, and as time goes on it gradually slows down to around 500Mb/min.
I have tried this on both our SCSI LTO drive, and USB3 RDX drive, and they both behave the same way.
The biggest file in the backup is 420Gb, and this is where the major slowdown happens.
It seems that the job speeds up again once it completes every "subjob" (Exchange, SQL etc etc)
So every subjob will start at around 4,000Mb/min, and gradually slow down. So the bigger the files it has to backup, the slower it will get.
This will happen no matter where the data is, over the network or on a local disk...
I dont think its the network, as while this backup is running, I can copy data to the local server at over 6,000Mb/min...... and bakup to disk jobs in Arcserve run fine. It seems its only backup to tape jobs.
I also question if its the hardware, as both USB and SCSI devices behave the same way.
Any help would be appreciated.
The backup starts at around 4,000Mb/min, and as time goes on it gradually slows down to around 500Mb/min.
I have tried this on both our SCSI LTO drive, and USB3 RDX drive, and they both behave the same way.
The biggest file in the backup is 420Gb, and this is where the major slowdown happens.
It seems that the job speeds up again once it completes every "subjob" (Exchange, SQL etc etc)
So every subjob will start at around 4,000Mb/min, and gradually slow down. So the bigger the files it has to backup, the slower it will get.
This will happen no matter where the data is, over the network or on a local disk...
I dont think its the network, as while this backup is running, I can copy data to the local server at over 6,000Mb/min...... and bakup to disk jobs in Arcserve run fine. It seems its only backup to tape jobs.
I also question if its the hardware, as both USB and SCSI devices behave the same way.
Any help would be appreciated.
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
-
6
4
- +1
12 Comments
Active today
Usually this is because it can only write at the slower speed. At the beginning it uses ram as a cache and is only limited by the read speed. But as ram fills up, it slows down to eventually be the speed of the write location.
Active today
First -- you use "Mb" when listing your speeds. By convention, "Mb" is "megabits", and "MB" is megabytes -- that is, it takes 8 Mb to make 1MB. Do you really mean to be talking about megabits? The difference is less than an order of magnitude, but still rather significant.
Second -- Which LTO drive and tapes are you using? There's more than an order of magnitude performance difference between LTO-1 and LTO-5.
I don't believe that this is a target speed problem (that is, a problem with the thing you are writing to). Your test that showed the same behaviour to both tape and RDX seems to eliminate that. Nor does it sound like a network problem.
Rather, there's something about your server or disk configuration that is not optimal. If you're running Windows of some flavor, check PerfMon to see if there is something degrading over time. Perhaps your version of ARCserve has a memory leak and its performance is degrading over time. Maybe your disk subsystem is performing poorly -- what are your topology and underlying hardware? Which RAID controller are you using?
I would certainly check to see if there is a newer version or update to ARCserve in any case.
Second -- Which LTO drive and tapes are you using? There's more than an order of magnitude performance difference between LTO-1 and LTO-5.
I don't believe that this is a target speed problem (that is, a problem with the thing you are writing to). Your test that showed the same behaviour to both tape and RDX seems to eliminate that. Nor does it sound like a network problem.
Rather, there's something about your server or disk configuration that is not optimal. If you're running Windows of some flavor, check PerfMon to see if there is something degrading over time. Perhaps your version of ARCserve has a memory leak and its performance is degrading over time. Maybe your disk subsystem is performing poorly -- what are your topology and underlying hardware? Which RAID controller are you using?
I would certainly check to see if there is a newer version or update to ARCserve in any case.
Active today
"Â and bakup to disk jobs in Arcserve run fine. It seems its only backup to tape jobs."
It's the speed it can write to the tape. Lots of factors involved, compression actually can speed up the process.
It's the speed it can write to the tape. Lots of factors involved, compression actually can speed up the process.
Hi,... sorry... Everything is in MB.... The tape is an LTO4......
I'm thinking of rebuilding the server....... I just have spent over 6 months trying to fix this, and maybe there is something else running on the server that is causing the problem....
I'll rebuild it with just Arcserve running, and see if that makes things run faster.
I'm thinking of rebuilding the server....... I just have spent over 6 months trying to fix this, and maybe there is something else running on the server that is causing the problem....
I'll rebuild it with just Arcserve running, and see if that makes things run faster.
Hmmm the backup has been running for 45 mins... Backed up 105Gb...
Started at 3900MB/sec, and is now at 2480MB/sec and dropping..... the free memory has remained at around 4GB.....
Started at 3900MB/sec, and is now at 2480MB/sec and dropping..... the free memory has remained at around 4GB.....
Active today
How much is the backup process using? You can also see the io on the other tab with separate reads and writes. Watch if the reads are more than the writes.
There are a few processes active:
Tapeeng.exe 15MB
CARunJob.exe 20MB
CAagstart.exe 42MB
the CA stuff isnt using that much... the biggest resource is w3wp.exe with 915MB... and SQL with 769
Tapeeng.exe 15MB
CARunJob.exe 20MB
CAagstart.exe 42MB
the CA stuff isnt using that much... the biggest resource is w3wp.exe with 915MB... and SQL with 769
If you are still looking for Answer the visit
Best location to get answer would be https://communities.ca.com/
or you can go to ARCserve Chat (Free)
http://www.arcserve.com/us/support.aspx
Best location to get answer would be https://communities.ca.com/
or you can go to ARCserve Chat (Free)
http://www.arcserve.com/us/support.aspx
Hi.... I ended up fixing it by buying a new piece of hardware......
I did try replacing the motherboard in my current server, but it didn't make a difference. I have no idea what was causing the slowdown. I reckon something in the OS/software..... I don't think it was hardware related, as I pretty much tested every piece of hardware in the server.
I did try replacing the motherboard in my current server, but it didn't make a difference. I have no idea what was causing the slowdown. I reckon something in the OS/software..... I don't think it was hardware related, as I pretty much tested every piece of hardware in the server.
Featured Post
Benefit from a mission critical IT monitoring with Monitis Premium or get it FREE for your entry level monitoring needs.
-Over 200,000 users
-More than 300,000 websites monitored
-Used in 197 countries
-Recommended by 98% of users
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
Microservice architecture adoption brings many advantages, but can add intricacy. Selecting the right orchestration tool is most important for business specific needs.
After seeing many questions for JRNL_WRAP_ERROR for replication failure, I thought it would be useful to write this article.
This tutorial will give a short introduction and overview of Backup Exec 2012 and how to navigate and perform basic functions.
Click on the Backup Exec button in the upper left corner. From here, are global settings for the application such as conne…
This tutorial will walk an individual through the process of installing of Data Protection Manager on a server running Windows Server 2012 R2, including the prerequisites.
Microsoft .Net 3.5 is required. To install this feature, go to Server Manager…
Suggested Courses
Earn Certification
HTML5 Specialist - Certification
Free withPremium
Course of the Month6 days, 13 hours left to enroll
Earn Certification
MCSA Configuring Windows 7 Exam 70-680
$49.00$44.10
622 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.