XSAN 4: Read speeds are extremely slow. Write speeds ok

Question

XSAN 4: Read speeds are extremely slow. Write speeds ok

Hello,

We upgraded all of our machines to Yosemite at the end of March, and by doing so we started using XSAN 4 within the Server App. We were successful in configuring and mounting the volume to all controllers and clients. Moving/copying files onto the SAN volume runs as expected with normal data transfer speeds. Moving/copying files from the SAN volume takes an extremely long time. A 50GB file took 16 hours to finish copying from the SAN volume. This is a one way data transfer issue that I have never encountered before. Looking for advice/tips/help on this issue. Our system setup is below. Let me know if there is any information that I have not provided, which would be useful/helpful.

6 clients- iMac desktops running Yosemite 10.10.2 (3 from 2012; 3 from 2014)

1 controller- Mac Mini running Yosemite 10.10.2

ActiveStorage RAID- updated firmware (1.40) and configured as SAN for XSAN

QLogic SANBox 5800 Fiber Switch

7 SANLink2

Posted on Apr 13, 2015 4:10 PM

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Answer 1

Apr 15, 2015 3:12 PM in response to PineappleJedi

We are seeing similar issues, though not to that degree.

According the BlackMagic's Speed Utility, our Write speeds are ~200Mb/s faster than our Read's (600 Write / 400 Read)

However, the Read speed is "jumpy" and inconsistent.

Have you run any speed tests?

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Answer 2

shryocdj

Level 1

30 points

Apr 22, 2015 7:34 PM in response to matthew.heinrich

Haven't done much experimenting yet, just now hearing complaints about slowness navigating folders.

I'm wondering if these settings (see below) have anything to do with it (hoping to implement soon).

Configure recommended settings for Xsan volumes created in OS X Server (Yosemite) - Apple Support

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