Tape Drive and SSH Latency

[Eric Bakken]

Hello all,

Recently one of my tape drives that was doing a daily backup started having some strange latency issues. The drive seems to work fine but just operates at a much slower rate. I've also noticed that logging in via SSH is taking about 30 seconds instead of being almost instant. What's strange is that everything seems to be operating normal including a second tape drive other than these two things.

I'm not sure how the tape drive speed and SSH login would be related. Does anyone have any ideas? Thanks,

-Eric Bakken

[Sundar_7 · Accepted solution]

I cannot think of anything to relate SSH login to tape drive backup.

But, check the name resolution settings in your system.

If the DNS server listed first in the /etc/resolv.conf doesnt respond, the resolver will wait for a timeout before proceeding with the next DNS server listed in resolv.conf.

This could introduce a delay in SSH/telnet and also in backup if you are using any of the commercial data management softwares that rely on DNS to resolve the client hostnames.

Sundar.

[Alzhy]

It would appear to me you are using SSH to tunnel backup stream (tar, vxdump, fbackup, etc.) accross the network - correct?

Can you confirm?

If the above is truly the case as we've been doing, then the 2 can indeed be attached... SSH can indeed be a factor in the equation.

[Eric Bakken]

Excellent! It was indeed the /etc/resolv.conf entries. It Turns out that my network guy pulled a domain controller last week while I was away! I actually had corrected this already but didn't realize that It would fix my problem. Thanks for the help,

-Eric

[Sundar_7]

Good ! glad I could be of help !