Slow Copy Speeds

[bruiz@freshkist.com]

I've been looking into the copy speeds that ViceVersa achieves.

I noticed some slowness on transfers over the network, so I decided to run some tests locally on a machine with 2 7200RPM ATA 100 hard drives (C: and D.

A 7200 RPM ATA 100 hard drive is capable of about 25MB/s read / write. Thus, this is logically the highest speed I could expect to see.

The test folder was a user folder containing 2.5 GB of data, ranging from files in the low KB to a 1GB PST file.

First, I tested the speed I got with Windows Explorer (Windows 2000) copy / paste. I timed it and it finished at exactly 100 seconds. Thus, I got about 25MB/s transfer speed, the bottleneck on the drives.

Next I deleted the contents of the target folder and scheduled the exact same backup with Vice Versa 2.0.0.10. The settings were:

Execution-

Method: Backup (Mirror Source To Target)
Process Priority: High
File Copy Optimization\Buffer Size: 2097152
Copy files even if timespamp changes after initial comparison
Copy directly to destination file
Try to copy files that are in use by other applications
No empty source/target check

I ran the job. This job took more than three times as long, 331 seconds. And that is not including the comparison. Thats ~7.55MB/s.

Next, I ran a Vice Versa backup from one folder on the C: Drive to another on the same drive. I watched the transfer rates the whole time. It capped out at aroud 4 MB/s on the PST file. (Slower since it was reading and writing to the same hard drive).



Now my question(s):
Does Vice Versa really have THAT much overhead?
What causes the loss of nearly three quarters of the possible transfer rate?
Is there anything that can be done to improve transfer speeds?

[TGRMN Software]

Hello, thanks, we need to test this on our machines.
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TGRMN Software Support
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http://www.compareandmerge.com

[bruiz@freshkist.com]

So... any news on this?

[seuhraeghee@yahoo.com]

I too would like to know why it's so slow copying. I'm trying to do a copy from an internal 7200RPM HD to an external 7200RPM HD (usb2) and it's been copy at approx 500k / sec.

I even tried disabling Kasperky Anti-virus, and still no change.

Any thoughts on this?

[TGRMN Software]

Hi , what is the average file size you are trying to copy? Many small files? thanks
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TGRMN Software Support
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[seuhraeghee@yahoo.com]

I am backing up a folder with various file sizes. Majority of the files are small, but I have about 10 files that are greater than 1 GB.

I have a second problem -- I can't EVER go through the backup without it giving me a "network share is no longer available" error. It takes me about 10-15 tries to backup the whole folder.

I'm trying to backup about 14 gigs of data onto a network drive, and I keep running into both slow copy speeds AND the "network share is no longer available error."

I'm running windows XP professional if that helps.

Any thoughts to make my backup go smoother?

Thanks-

[bruiz@freshkist.com]

Varied file sizes. Largest (in the test) was about 1GB, but there were a bunch of smaller files too.

[sspike]

I am using the 'mirror' function.
Replicating between 2 servers (Windows 2k & 2k3).
1 Tb to copy - varying file sizes. (.5Kb to 1Gb)

Using robocopy and Explorer to copy - good speeds.
ViceVersa on 5Mb/s.

Can you assist?
Steve

[Guest]

still waiting on a reply for this issue...

what can be done to speed up the copy speed?

transferring large files over ethernet at 900 kb/s is really frustrating!!

can you please reply and let us know what the status of this issue is? (looking into it, working on a patch, don't care, etc...)

thanks.

[TGRMN Software]

We are trying to reproduce this but are unable to on our network. We are trying different configurations. If possible I would like you to do this test:

- Choose a large file >20MB.
- Copy this large file using Windows Explorer copy and paste from source to target and see how long that takes.
- Delete this file from target.
- Start ViceVersa and compare source and target clicking on 'compare'.
- In the comparison window, select the same file above from source, then right click and from the menu select copy to target. See how long that takes.

Do the same with a group of 20 smaller files (< 100K)

You can also try out some of the performance / bandwidth settings, such as 'flush buffer every write' and 'copy buffer size'

thanks!!
_________________
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TGRMN Software Support
http://www.tgrmn.com
http://www.compareandmerge.com

[me]

Hello,

Is there any news yet regarding the slow copying speed. I did not have this problem with a former version of this software.

[TGRMN Software]

Hi, what disks are your source and target ? thanks
_________________
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TGRMN Software Support
http://www.tgrmn.com
http://www.compareandmerge.com

[TGRMN Software]

The main improvement is to switch on the option "Copy directly to destination file (do not use a tmp file)" in the ViceVersa profile settings->advanced settings.

This option is not enabled by default, because it is safer to copy to a temp file and then, if the copy is succesful, rename the temp file into the destination file. If the operation fails in the middle of copying the target file is still undamaged when using a temp file. But it does take a bit longer.

If speed is the main concern, enable the option above.

If you are still seeing performance issue after this, please write to support@tgrmn.com, thanks!
_________________
--
TGRMN Software Support
http://www.tgrmn.com
http://www.compareandmerge.com