Not building block chain on a NAS, because: cannot lock #9157

Calling bitcoin-qt on a 64bit Win10 machine with a datadir on a NAS does not work. Not with a fully coppied block chain nor with an empty one.

Can you reliably reproduce the issue?

YES

If so, please list the steps to reproduce below:

1. My Call: "C:\Program Files\Bitcoin\bitcoin-qt.exe" -datadir=\DISKSTATION\Datengrab\Bitcoin
   ----------its is a double \ \ before DISKSTATION (github steals one ""-----

2. The log on the NAS confirms, that it could find the NAS and its folders debug.log: 2016-11-14 16:08:54 Bitcoin version v0.13.1

3. 2016-11-14 16:08:55 Default data directory C:\Users\Ich\AppData\Roaming\Bitcoin 2016-11-14 16:08:55 Using data directory \DISKSTATION\Datengrab\Bitcoin\

4. 2016-11-14 16:08:55 Opening LevelDB in \DISKSTATION\Datengrab\Bitcoin\blocks\index 2016-11-14 16:08:55 IO error: C:\Program Files\Bitcoin\DISKSTATION\Datengrab\Bitcoin\blocks\index\LOCK: Could not lock file. 2016-11-14 16:08:58 init message: Lade Blockindex... 2016-11-14 16:08:58 Wiping LevelDB in \DISKSTATION\Datengrab\Bitcoin\blocks\index 2016-11-14 16:08:58 Opening LevelDB in \DISKSTATION\Datengrab\Bitcoin\blocks\index 2016-11-14 16:08:58 IO error: C:\Program Files\Bitcoin\DISKSTATION\Datengrab\Bitcoin\blocks\index\LOCK: Could not lock file.

THAT I/O-Error-Problem is strange: The path is not correct at all: C:\Program Files\Bitcoin\DISKSTATION\Datengrab\Bitcoin\blocks\index\LOCK

What version of bitcoin-core are you using?

Loaded from the official distribution site: https://bitcoin.org/de/download Version is 0.13.1

Machine specs:

• OS:
• CPU:
• RAM:
• Disk size:
• Disk Type (HD/SDD):

It works great with block chain on SSD (C: and on D:), problem only with Synology NAS DS213j, DSM 6.0.2-8451 Update 3

NAS are not supported by levelDB (most protocols like SMB and AFP do not work). It's also not recommended because of the heavy I/O happening with the UTXO set (levelDB).

Ok, thanks for your fast answer.

It's also not recommended because of the heavy I/O happening with the UTXO set (levelDB).

Indeed. What seems to work though, is to store the block chain on a NAS and the leveldb on a local, fast harddisk. But this needs some symbolic link tricks which are probably not available on windows.

Running a pruned node is probably better option for most users with disk space issues.