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Mysterios error message & slowwrite performance via NAS 
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Joined: Mon Nov 30, 2009 21:35
Posts: 38
Post Mysterios error message & slowwrite performance via NAS
Dear Tuxera,
can you clarify please *what* is
Code:
Dec 10 19:11:57 localhost ntfs-3g[3243]: ntfs_mst_post_read_fixup: magic: 0x00000000  size: 1024  usa_ofs: 0  usa_count: 65535: Invalid argument

message ?
Cluster size, in fact, is exactly set to 64K. The data is fed through SAMBA, CPU load never goes for above 2% of a single core.

This causes problems with isochronous data transfers.


Thu Dec 10, 2009 18:36
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Joined: Mon Nov 30, 2009 21:35
Posts: 38
Post Re: Mysterios error message & slowwrite performance via NAS
Correction: ordinary write ops load the system for very reasonable amounts of CPU (40% and more)


Thu Dec 10, 2009 18:50
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NTFS-3G Lead Developer

Joined: Tue Sep 04, 2007 17:22
Posts: 1010
Post Re: Mysterios error message & slowwrite performance via NAS
Hi,

Quote:
can you clarify please *what* is
Quote:
Dec 10 19:11:57 localhost ntfs-3g[3243]: ntfs_mst_post_read_fixup: magic: 0x00000000 size: 1024 usa_ofs: 0 usa_count: 65535: Invalid argument

message ?


This is the conclusion of a standard sanity check. I think this happens at initialization time while analyzing a transaction log file, which has never been written to (which means this device has never been written to by Windows), but I am not sure.

Unless you have some other error message, you need not worry.

Quote:
ordinary write ops load the system for very reasonable amounts of CPU (40% and more)

This is not strange if you are feeding your computer from a high speed network. What is the throughput and what is the load on the ntfs-3g process ?

Regards

Jean-Pierre


Thu Dec 10, 2009 19:43
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Joined: Mon Nov 30, 2009 21:35
Posts: 38
Post Re: Mysterios error message & slowwrite performance via NAS
jpa wrote:
This is the conclusion of a standard sanity check. I think this happens at initialization time while analyzing a transaction log file, which has never been written to (which means this device has never been written to by Windows), but I am not sure.

Unless you have some other error message, you need not worry.

But these are plenty of in /var/log/message :roll:
Please consider also that many NAS systems are built over SSD - a kind of media where the rewrite count per sector is limited

Quote:
This is not strange if you are feeding your computer from a high speed network. What is the throughput and what is the load on the ntfs-3g process ?

The NAS was not overloaded

I'am still unsure which actually caused stalls; most likely is a client


Thu Dec 10, 2009 23:50
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