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tar slow on NFS

Posted on 2014-01-01
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Last Modified: 2014-01-21
We have many small files which stored on the NFS side. We want to tar the directory and then move these data to other NFS filesystem after two weeks. Now the problem is that the tar speed is very slow.One directory is 400M. It took 4 minutes to finish the tar command. We have many directories like this. It took a long time to tar all the files. We tested it on 3 servers and the time is almost same. If we move the data to other NFS filesystem, the tar time is reduced dramatically. But the data transferring time from filesystems also took a long time. What should I do ?
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Question by:c11v11
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6 Comments
 
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Gregory Miller earned 500 total points
ID: 39749856
http://www.cyberciti.biz/faq/howto-use-tar-command-through-network-over-ssh-session/

This will allow the tar command to run on the remote box as a local process and then copy the resulting file where you want it, instead of moving the 400MB worth of raw files across the network and then the resulting compressed version back again.

This could be easily scripted
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by:omarfarid
ID: 39750921
Check you system and the NFS server network cards speeds and mode. It could be a network interface / card settings issue.
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Author Comment

by:c11v11
ID: 39751114
we tested this tar command on different servers.  If my understanding is right, this should not work for my problem. We have two folders which are both mount at the NFS NAS. We need to tar one of the folders first and then move this tar file to another folder. The problem is that in that folder we have many small files, that took a long time to run the tar command. We really want to get a way to speed up the tar command.
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by:Gregory Miller
ID: 39751190
we tested this tar command on different servers.  If my understanding is right, this should not work for my problem.
Did you try this or did you assume it will not work?

Is the NAS box an actual computer with an operating system on it or one of those off-the-shelf drive sharing devices? If it is a computer, what operating system is it using? If not, then you are correct, it will probably not work and I should have asked my question in advance of the suggestion.
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Author Comment

by:c11v11
ID: 39751260
We are using EMC NAS. I just assume it.  I noticed that I must have another server to run that command # tar zcvf - /wwwdata | ssh root@dumpserver.nixcraft.in "cat > /backup/wwwdata.tar.gz"  Can I use the same server as I am running this command ?   what is the secret behind this  if this is working?   I will try to test it.  Thank you.
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by:Gregory Miller
ID: 39751272
The secret is that you must be able to ssh into the NAS device and execute the tar command via tunnel. I do not know the EMC product so you may just have to try it to know for certain.
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