Question

How to setup WOL in CentOS 5.1

Asked by: Electronics

I am having problems in setting up WOL in CentOS 5.1
Can someone help me in providing the procedure to do it?

I am implementing SAMBA on this server to use as a NAS server.
I would like to make the system sleep when the mounted disks are not accessed for more than 10 minutes,
and wakeup with just clicking on the network disk on a windows machine.

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Asked On
2009-09-29 at 21:35:01ID24772452
Tags

CentOS

,

WOL

,

Wakeup on LAN

,

Linux

,

SAMBA

,

NAS

Topics

TCP/IP

,

CentOS

,

Networking Protocols

Participating Experts
3
Points
400
Comments
8

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Answers

 

by: ElectronicsPosted on 2009-10-01 at 08:01:55ID: 25469449

Increased points

 

by: joolsPosted on 2009-10-06 at 05:11:30ID: 25504073

This isnt wake on lan, you're thinking of waking from a sleep mode (apm), not necessarily a good idea for servers IMHO.

Check out the man/info page for apm.

WOL is used for starting servers that have been shut down (correctly)

 

by: ElectronicsPosted on 2009-10-09 at 13:02:14ID: 25538354

Hi ,
Yes I can use apm to send the server to sleep/hibernate (when there is no disk activity).

But... how do I bring it up when someone wants to access the samba mounted drive from a Windows machine or another Linux machine (from the network)?
Without using WOL how can the system comes back from sleep/hibernate?

 

by: ravenplPosted on 2009-10-09 at 23:09:10ID: 25541017

Actually You cannot. windows smb client would have to has wol client build in, and wait till Your linux is up. It will not work.

What You can is to turn off the idle drives(any other suitable devices) and enter S1 state.

 

by: joolsPosted on 2009-10-10 at 11:29:00ID: 25543234

You're not using the software as it's designed, WOL does not do what you want it to do.

Whilst APM *may* work it's not ideal to hibernate a server, there could be a lag while the system is waking up and you may get time out's, or possibly even lost data (I'm stretching it a bit here I know!)

 

by: ElectronicsPosted on 2009-10-12 at 10:13:13ID: 25552960

If I use WOL with -a ( not -g ) any packet will wake up the system. Isn't it?
That should make it possible to bring the system up with out WOL client.
Correct me if I am wrong, WOL client is required only when you need to send a magic packet or a password protected WOL

 

by: ravenplPosted on 2009-10-12 at 10:49:23ID: 25553342

"a" means wake on ARP query, so in my understand not every packet will wake the system up.
I think You should have a wins server on the net to have netnames resolved, and wake on unicast packets.
I have to admit though - I've never used any other option but "g".

What about timeouts?

Anyway - I haven't seen any software for that. You probably have to monitor samba activity (with smbstatus) and hibernating if idle.

 

by: ts4673Posted on 2011-01-04 at 12:35:43ID: 34475702

20120131-EE-VQP-002

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