<p>It is trying to acquire a lock on the lockfile in the data directory, which likely fails due to not being supported on the network file system you use to access your NAS.</p>

<p>Even if that could be safely ignored (the lockfile is just there to prevent you from running multiple Bitcoin Core instances on the same directory), it is a warning that more problems exist. In general, running a database on a network filesystem is a bad idea because of lack of support for operations or guarantees that databases require. It would either just not work, be very slow, or get corrupted very easily.</p>

<p>However, this is all because of the databases used (blocks/ index/, chainstate/ and wallet.dat). The block data itself is not a database, and could be moved elsewhere. Bitcoin Core does currently not support moving just the block data elsewhere, though.</p>

CC BY-SA 3.0
2014-04-22T06:15:39.497Z
2014-07-21T19:13:32.600Z
2014-07-21T19:13:32.600Z
Pieter Wuille
<p>I quite literally just had the same problem.
Downloaded 0.90 on Mavericks, connected to my FreeNAS box in Finder, made a directory to hold the block chain, told Bitcoin-QT to save the block chain there in the dialog and got the same message:</p>

<p>A fatal error occurred. Bitcoin can no longer continue safely and will quit.</p>

<p>EXCEPTION: N5boost12interprocess22interprocess_exceptionE<br>
Operation not supported<br>
bitcoin in Runaway exception</p>

CC BY-SA 3.0
2014-03-23T17:57:03.070Z
This could be better as it's own question or a comment adding more info the problem.
John T
CC BY-SA 3.0
2014-03-22T23:40:31.693Z
2014-03-22T23:40:31.693Z
Rob
<p>I have done the instructions listed here:
<a href="https://bitcoin.stackexchange.com/questions/11367/how-to-move-bitcoin-data-from-application-support-on-external-drive-mac">How to move Bitcoin data from Application Support on an external drive [Mac]</a></p>

<p>It works fine for a flash drive connected the mac, but I wanted to have the data read from my network storage device (ReadyNAS). Bitcoin-qt comes up with the following error when I link it to the NAS:</p>

<pre><code>EXCEPTION: N5boost12interprocess22interprocess_exceptionE       
Operation not supported       
bitcoin in Runaway exception 
</code></pre>

<p>Any ideas on what this could be?</p>

<bitcoin-core><backup><mac>
Bitcoin-qt data on external drive
k3tan
# Bitcoin-qt data on external drive

(Asked by: username_0 on 2014-03-22)

I have done the instructions listed here:
How to move Bitcoin data from Application Support on an external drive [Mac]
It works fine for a flash drive connected the mac, but I wanted to have the data read from my network storage device (ReadyNAS). Bitcoin-qt comes up with the following error when I link it to the NAS:
EXCEPTION: N5boost12interprocess22interprocess_exceptionE       
Operation not supported       
bitcoin in Runaway exception 

Any ideas on what this could be?

**Tags:** bitcoin-core, backup, mac


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## 2 answers

### Answer by username_1 on 2014-04-22. Score: 1

It is trying to acquire a lock on the lockfile in the data directory, which likely fails due to not being supported on the network file system you use to access your NAS.

Even if that could be safely ignored (the lockfile is just there to prevent you from running multiple Bitcoin Core instances on the same directory), it is a warning that more problems exist. In general, running a database on a network filesystem is a bad idea because of lack of support for operations or guarantees that databases require. It would either just not work, be very slow, or get corrupted very easily.

However, this is all because of the databases used (blocks/ index/, chainstate/ and wallet.dat). The block data itself is not a database, and could be moved elsewhere. Bitcoin Core does currently not support moving just the block data elsewhere, though.


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### Answer by username_2 on 2014-03-22. Score: 0

I quite literally just had the same problem.
Downloaded 0.90 on Mavericks, connected to my FreeNAS box in Finder, made a directory to hold the block chain, told Bitcoin-QT to save the block chain there in the dialog and got the same message:

A fatal error occurred. Bitcoin can no longer continue safely and will quit.

EXCEPTION: N5boost12interprocess22interprocess\_exceptionE  
Operation not supported  
bitcoin in Runaway exception

> **Comments:**
> **username_3**: This could be better as it's own question or a comment adding more info the problem.  

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