NAS problem - disconnect after display goes to sleep

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Level 1

8 points

NAS problem - disconnect after display goes to sleep

Hope, this will match the category.

I have Synology DS-409+ NAS with some shares by AFP. These shares automatically connect on login. In System Preferences "Put hard disks to sleep when possible" is NOT checked.

So, the problem. When I work on Mac everything is ok. But several minutes after it puts display to sleep when it's idle, NAS shares are disconnected and every programs that use them (Transmission, iTunes, etc) are hang up. If i quickly quit (or force quit) these apps, then I can manually reconnect shares. If I don't do that I'll get completely hanging system and have to power it down to reboot.

Any ideas?

Mac Mini, Mac OS X (10.5.7), Synology DS409+ NAS, AFP shares

Posted on Aug 5, 2009 2:24 AM

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Answer 1

bphendri

Level 1

119 points

Aug 5, 2009 2:38 AM in response to salsaly4

Sure. It's not just the display that is going to sleep, but the entire system is going to sleep, and thus causing your Ethernet hardware to go to sleep as well. Thus disconnecting the NAS that is shared by AFP.

The option "Put hard drives to sleep when possible" only affects hard disks that are connected to one of the system bus's (Internal, Firewire, or USB.), and is completely independant of "System sleep" or "Display Sleep."

When the system goes to sleep, all network connections are dropped. I am not sure if there is a way around this.

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Answer 2

salsaly4 Author

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8 points

Aug 5, 2009 4:36 AM in response to salsaly4

Sorry, just forgot to mention that in Energy Saver properties "Computer sleep" is set to "Never".

And I've just got the same situation while working on the Mac... So, it's not the issue with sleeping anything now...

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Answer 3

bphendri

Level 1

119 points

Aug 6, 2009 8:22 AM in response to salsaly4

Just curious.

Do any other "Stay alive" network services disconnect, such as iChat, Yahoo Messenger, etc after the display goes to sleep?

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Answer 4

salsaly4 Author

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8 points

Aug 6, 2009 3:22 PM in response to salsaly4

No. Left Adium to work - it does not disconnect. Only AFP shares do (and I was able to see the "Network disk(s) disconnected" with list of all shares from NAS.

Also, as I've said in previous reply, it happens not only when display goes to sleep. Seems that it is a NAS problem - only high load on random access works (many torrent files). When streaming HDTV movies in loop it works perfectly, when nothing is accessing shares except iTunes - everything is ok, shares are not dropped.

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Answer 5

bphendri

Level 1

119 points

Aug 7, 2009 8:02 AM in response to salsaly4

I'm wondering if the hard drive mechanism is "Spinning Down" after being idle , which is causing the NAS device to drop the AFP shares.

Is there any setting on the NAS device itself that might appear to prevent this from happening?

You might want to drop the manufacture of the NAS device and email regarding the problem. It might not be related to your mac at all.

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Answer 6

salsaly4 Author

Level 1

8 points

Aug 12, 2009 3:17 PM in response to salsaly4

Got one idea. It's not linked with sleep of Mac anyway.

I've got maximum number of open files on NAS (I can see it with ulimit command) set to 1024. It seems that somehow the NAS reaches that limit and drops the share.

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Answer 7

bphendri

Level 1

119 points

Aug 17, 2009 7:08 PM in response to salsaly4

Interesting.... Would not have thought of that..

Just curious how you came by that?

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Answer 8

salsaly4 Author

Level 1

8 points

Sep 1, 2009 2:50 AM in response to salsaly4

Well... I've limited simultaneous transfers and connections in torrent client. Now everything works, but I've got the situation one more time. But it's more comfortable now - it was once in 15-20 minutes earlier.

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