Apple Xsan Uživatelský manuál stáhnout pdf (Strana 27)

Chapter 2 Planning a Storage Area Network 27

How Should Users See Available Storage?

If you want users working on a project to see a volume dedicated to their work, create

a separate volume for each project. If it’s acceptable for a user to see a folder for his or

her work on a volume with other peoples’ folders, create a single volume and organize

it into project folders.

Workow Considerations

How much le sharing is required by your users’ workow? If, for example, dierent

users or groups work on the same les, either simultaneously or in sequence, it makes

sense to store those les on a single volume to avoid having to maintain or hand o

copies. Xsan uses le locking to manage shared access to a single copy of the les.

Performance Considerations

If your SAN supports an application (such as high resolution video capture and

playback) that requires the fastest possible sustained data transfers, design your SAN

with these performance considerations in mind:

Set up the LUNs (RAID arrays) using a RAID scheme that oers high performance. Â

See “Choosing RAID Schemes for LUNs” on page 28.

Assign your fastest LUNs to an anity tag for the application. Assign slower LUNs to Â

an anity tag for less demanding applications.

To increase parallelism, spread LUNs across dierent RAID controllers. Xsan then Â

stripes data across the LUNs and benets from simultaneous transfers through two

RAID controllers.

To increase parallelism for an anity tag assigned to relatively small LUNs (the size Â

of one or a few drive modules), create a slice of similar size across all drives on a

RAID controller instead of creating the LUNs from one or two drive modules.

Spread le transfers across as many drives and RAID controllers as possible. Â

Try creating slices across the drives in RAID systems, and then assign these slices

to the same anity tag.

To increase throughput, connect both ports on client Fibre Channel cards to the Â

fabric.

Store le system metadata and journal data on a separate storage pool from user Â

data and make sure the metadata LUNs aren’t on the same RAID controller as user

data LUNs.

Use a second Ethernet network (including a second Ethernet port in each SAN Â

computer) for SAN metadata.

If your SAN uses directory services, mail services, or other services on a separate Â

server, connect SAN computers to that server on an Ethernet network separate from

the SAN metadata network.

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Apple Xsan Uživatelský manuál Strana 27