Xsan 2.3 or later: Deactivating a storage pool (Apple KB)

It may be necessary to deactivate (down) an Xsan data storage pool in a volume, but retain access to data on other storage pools within the volume. You may need to do this if there is a LUN issue in an Xsan storage pool and Xsan clients are unable to mount the Xsan volume, for example.

Read more: http://support.apple.com/kb/HT4656

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About EFI firmware updates (Apple KB)

Learn how to identify if your Intel-based Macintosh computer needs an EFI firmware update and how to apply EFI firmware updates to Intel-based Macintosh computers.

Read more: http://support.apple.com/kb/HT4125

Xsan: How to set Spotlight search levels (Apple KB)

You can change how Spotlight searches work with your Xsan.

Read more: http://support.apple.com/kb/HT3749

abstractrude's picture

OS X 10.10 Yosemite and Xsan

OS X Server and Xsan live on!

Apple Knowledge Base's picture

Apple Cinema Display: Troubleshooting steps (Apple KB)

Learn about troubleshooting steps you should follow if you experience any issues with your display.

Read more: http://support.apple.com/kb/HT2810

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Final Cut Pro X 10.1: Scroll bars intermittently disappear (Apple KB)

The horizontal and vertical scroll bars might intermittently disappear in the Event Browser and Timeline in Final Cut Pro X 10.1.x. This can occur after you pair a mouse or trackpad with your MacBook Pro (Retina, Late 2013) or Mac Pro (Late 2013).

Read more: http://support.apple.com/kb/TS5438

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Using 4K displays and Ultra HD TVs with Mac computers (Apple KB)

Learn about using 4K displays and Ultra HD TVs with Mac computers.

Read more: http://support.apple.com/kb/HT6008

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Mac Pro (Late 2013): "Boot Configuration" alert when installing Windows 8 (Apple KB)

A "Boot Configuration" alert might appear when installing Windows 8 on a Mac Pro (Late 2013) via Boot Camp Assistant.

Read more: http://support.apple.com/kb/TS5413

Andrew Allen's picture

Can a corrupt/buggy Xsan filesystem cause extremely low read/write speeds on a SAN?

For the sake of brevity, I've leave out the 3 months of background information trying to resolve the problems we've had.

We have a SAN that used to have 450-550 MG/s read/write speeds. It preformed this way for 4.5 years. Now it's writing and reading at much lower speeds, like 40-150 MG/s write speeds and 250-300 read speeds. YES, we've investigated all the likely things: SFPs, fibre cables, thoroughly investigated the fibre switch, checked the RAID controller, etc.

My question is simply this: Does anyone know if it's possible for a degraded/corrupted/buggy Xsan filesystem to cause such heavily reduced speeds? To our knowledge, we have never run a cvfsck on this Xsan volume and it's been in heavy use for almost 5 years. I'm going to do run this tomorrow. Could the Xsan filesystem be the cause of our degraded drive speeds?

Apple Knowledge Base's picture

Intel-based Mac: Startup sequence and error codes, symbols (Apple KB)

The following is an overview of the startup sequence, error conditions, and behaviors for all Intel-based Macintosh systems.
Note that some newer Macintosh models only use tones to indicate error conditions. See this article for more information.

Read more: http://support.apple.com/kb/HT2674

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