Apple Xsan 1.4 - Manual (Page 143)

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Solving SAN Problems
This chapter provides solutions to common problems you
might encounter while working with a SAN.
Look here for solutions to common problems you might encounter while setting up,
managing, or using an Xsan SAN.
A Dialog on a Client Reports That a LUN Is Unreadable
Xsan volumes can now include LUNs larger than 2 terabytes (TB). However, older
clients (those running Xsan on Mac OS X 10.3 Panther or Xsan 1.2 or earlier on
Mac OS X 10.4 Tiger) cannot read these large LUNs. A dialog appears on these older
clients that says the LUN is unreadable. Be sure to click Ignore to dismiss this dialog.
Do not click Format, or information on the corresponding Xsan volume will be lost.
If you use LUNs greater than 2 TB, you should upgrade your clients to Xsan 1.3 or later
on Mac OS X or Mac OS X Server v10.4.
You’re Unable to Connect to a Computer Using Xsan Admin
If there is a firewall between the administrator computer and the SAN computer, make
sure TCP port 311 is open.