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mikeel
1 Nickel

NetWorker 7.6 - Encryption directive uses up all linux client memory

All,

Running the following config:

Solaris 10 NetWorker Server 7.6.2.2.Build.651
Client Redhat 5 Linux 2.6.18-74.18.1.el5 running NetWorker
7.6.3.2.Build.851

Problem is with the default "Encryption Directive" enabled for the linux client, when the backup runs all memory gets exausted on the client side causing the entire system to hang.  Normal backups without the encryption directive run without issues.  We have doubled the amount of memory in the client from 8gb to 16gb and the issue persists.  It appears that there may be a memory leak with the save process when encryption is enabled.

The client system backs up 1 TB of data.

The problem was also seen on the client when it was running 7.6.2.2, and we since upgraded to the latest 7.6.3.2.Build.851 to see if it would correct the problem. 

Is this a known issue?  Any ideas?

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11 Replies
8 Krypton

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

Hi Michael,

First of all is that it's not recommended to use a higher version/build of NetWorker in the clients than in the server.

What is the directive you have set for the client, could you please give us some more information about the client configuration and properties? Have you checked what is the process using such amount of memory?

Thank you.

Carlos.

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8 Krypton

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

Hi Michael,

There are no known issues except that encryption is known to be resource intensive. 

Interestingly, from the NetWorker Command Reference Guide for 'aes', it states that:

"The aes ASM uses a software encryption algorithm to encrypt file data. aes uses a considerable

amount of CPU resources so its benefit may be limited on low-powered systems."

From this, it looks like CPU is the most important factor in this, so you might want to double-check that you have enough CPU on this system as well as memory.

-Bobby

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mikeel
1 Nickel

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

Thank you Carlos and Bobby for the responses.  I'm going to initiate a support ticket against this, as there is more site specific details which will need to be reviewed and not appropriate for a public forum.  Just wanted to verify whether there were any known memory leak issues with NetWorker 7.6.x and encryption on Linux clients, which doesn't seem to be the case.

I'll report back with the outcome of the case.

-Mike

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8 Krypton

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

Encryption is resource intensive operation on the NetWorker client and can significantly affect backup performance, Also if backin up with AES encryption  on drive with millions of small files will consumes a lot of memory, which will leads to memory leak , Check the backup performance with AES encryption off firstly.

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mikeel
1 Nickel

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

I've initiated EMC Support Ticket 46378182 against this issue.  The backups of the same Linux client without the Encryption Directive are successful, and they only use up .1% of RAM during the backup without any fluctuation.  There are other details included in the support ticket, so please reference the ticket if you would like further information.  Thanks, Mike.

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MargusR1
1 Nickel

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

Hi,

please post solution here if possible.

We have too all memory in use and intermittent extreme read performance drop.

we use 7.6.2.6 and also server solaris 10 and client rh linux.

Wbr

MR

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8 Krypton

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

Hi Michael Ellis,

What is the outcome of the support case , is it environmental issue causing the poor performance or there is millions of small files that consumes a lot of memory while encryption is performed ?

Thanks,

Ahmed Bahaa

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adietz00
1 Copper

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

I just started seeing this problem in my environment too. Any updates on the case?

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mikeel
1 Nickel

Re: NetWorker 7.6 - Encryption directive uses up all linux client memory

This issue is still ongoing.  Within EMC the problem has been escalated to subject matter experts, and is still currently under review.

Will post any further findings.

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