Apple Xsan 2 - Manual (Page 62)

After setting up the primary metadata controller, use the Users & Groups pane
of System Preferences (the Accounts pane on client computers with Mac OS X or
Mac OS X Server v10.6) to connect the computer to your directory server.
If you don’t use a directory server, you must create the same set of users and groups in
m
System Preferences on each SAN computer.
Important: If you create users and groups on each SAN computer, make sure each user
and group has a numeric user ID (UID) or group ID (GID) that is unique throughout
the SAN, and make sure each SAN user and group has the same UID or GID on all SAN
computers. One way to do this is to create an identical list of users and groups in the
same order on each computer, following a clean installation of the operating system.
Step 5: Set up RAID systems
Set up RAID Systems:
1 Follow the instructions that come with your RAID systems to turn them on and
configure their network, management, and security settings.
2 If your RAID systems come with RAID sets already configured, they’re detected during
SAN setup and you can skip to “Step 6: Create a metadata array” on page 62; otherwise,
use the management software that comes with the RAID system to create arrays based
on the RAID schemes of your choice, leaving three drives on one system unassigned so
you can create a small, separate metadata LUN as described in the next step.
For help choosing other RAID schemes, see “Choose RAID schemes for LUNs” on
page 47. Setup scripts for common configurations on Promise RAID systems are
available at www.apple.com/support/xsan/.
Step 6: Create a metadata array
Ten GB of disk space is enough to store the metadata for a volume containing 10
million files, so a two-drive RAID 1 (mirrored) array is generally large enough to store
the metadata for your SAN volume. If you dedicate a spare drive to this array to
guarantee availability, three drives are adequate for your SAN metadata. If your RAID
arrays consist of four or more drives, use these steps to convert an existing array into a
small metadata array so you can reuse the extra drives.
If you’ve set up a Promise RAID system using a script from www.apple.com/support/xsan/,
you should already have a two-drive RAID 1 array for metadata, and you can skip to
“Step 7: Enable Xsan on clients and controllers” on page 63.
Create the metadata array:
1 If you don’t have three spare drives or if all drives in your RAID systems belong to RAID
arrays, use the management app for your RAID system to delete an existing array.
2 Use two of the drives to create a two-drive RAID 1 (mirrored) array.
3 Assign a third drive as a dedicated spare for the array.
62 Chapter 4 Set up a SAN