v9 - Files to tape - a sudden drop in speed!?

Everything about backing up to tape

v9 - Files to tape - a sudden drop in speed!?

Veeam Logoby folerx » Thu Sep 29, 2016 10:03 pm

hi
External usb 3.0 hdd, ntfs formated with compression enabled, connected directly to veeam v9 via blue usb 3.0 port with blue usb cable, bla bla. SAS tape connection to host. Job have enabled compression and encryption.
As you can see on picture, speed drop from 40 to 7mb/s. After some time speed go again to 40mb/s or more. Why is here this anomalies in transfer speed? :?:
I have new job, new tape, same parameters and again drop in transfer speed. Very strange?!

old job
Image

new job
Image
folerx
Expert
 
Posts: 105
Liked: 8 times
Joined: Wed Jun 22, 2016 9:47 pm
Full Name: Daniel Kaiser

Re: v9 - Files to tape - a sudden drop in speed!?

Veeam Logoby Shestakov » Fri Sep 30, 2016 7:50 am

folerx,
You`ve got more than half a million of files to copy, are all of them approximately of the same size or some are bigger than others.
The thing is file to tape job copies small number of big files faster than huge number of small files.
Thanks
Shestakov
Veeam Software
 
Posts: 4863
Liked: 396 times
Joined: Wed May 21, 2014 11:03 am
Location: Saint Petersburg
Full Name: Nikita Shestakov

Re: v9 - Files to tape - a sudden drop in speed!?

Veeam Logoby folerx » Fri Sep 30, 2016 8:12 am

Yes, i know that bigger files have better speed. Files all are almost the same. But why job run some time with good speed and than drop? So file size or number of files is not reason. Or why after slow speed we have again good speed?
Will try to connect hdd direct onto sata port in motherboard and report back.
folerx
Expert
 
Posts: 105
Liked: 8 times
Joined: Wed Jun 22, 2016 9:47 pm
Full Name: Daniel Kaiser

Re: v9 - Files to tape - a sudden drop in speed!?

Veeam Logoby Dima P. » Fri Sep 30, 2016 11:50 am

Hello Daniel,

But why job run some time with good speed and than drop?

You can check the exact reason with the support team. Unfortunately, File to tape job engine is not optimized for a such number of source files in the existing version and slow performance is expected. This situation will be fixed in the upcoming major release.
Dima P.
Veeam Software
 
Posts: 6263
Liked: 442 times
Joined: Mon Feb 04, 2013 2:07 pm
Location: SPb
Full Name: Dmitry Popov


Return to Tape



Who is online

Users browsing this forum: No registered users and 6 guests