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Q: slow write transfer speed on shared xsan folder - osx 10.8.3

XSAN3 - OS X 10.8.3

 

I am getting slow transfer speeds when saving to a shared xsan folder using the smb protocol.

Writes are about 15 MB/s.  Reads are about 85 MB/s.

Some transfers to the shared xsan folder will fail and it doesn't matter if I am reading or writing.

 

If I share a folder from the system drive, the speeds are much higher and I do not have any transfer failures.

Writes are about 76 MB/s.  Reads are about 99 MB/s.

 

If I transfer files using the file server I am sharing from, I get write speeds close to 90 MB/s to the xsan volume.

 

Using the AJA Test Tool:

Maximum write speeds to the xsan volume are about 600 MB/s

Maximum read speeds from the xsan volume are bout 700 MB/s

 

The file server and metadata controllers are Mac Pro 5.1 Mid 2012.

Xsan Storage is the Vtrak EX30.

It is configured according to documentation supplied by apple and promise.

 

All Xsan clients are dual nic with nic 1 configured for public and nic 2 configured for the private.

I have checked the XSAN admin tool and all metadata IPs appear correct for all clients,

thery are all using the private IP.

Mac Pro, OS X Mountain Lion (10.8.3)

Posted on May 8, 2013 1:43 PM

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Q: slow write transfer speed on shared xsan folder - osx 10.8.3

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  • by Strontium90,

    Strontium90 Strontium90 May 12, 2013 5:52 PM in response to xadm
    Level 5 (4,077 points)
    Servers Enterprise
    May 12, 2013 5:52 PM in response to xadm

    What template did you use for the creation of the SAN?  Recall, if you did a video template but you are transferring generic office files, your performance will suffer.  This is due to the block allocation size calculations.  The SAN may be tailored for specific types of writes.  If you are doing something outside of the expectation, you may experience negative performance.