Promise Technology Pegasus J4 User Manual download pdf (Page 19)

Promise Technologies Pegasus J4User Manual

create a mirrored raid Set

ProtectyourdataagainsthardwarefailurewithamirroredRAIDset(alsocalled“RAID1”).Itwritesyour

data to two or more disks so that each disk in the set contains the same data as every other disk.

You can’t create RAID set that contains partitions on your startup disk. To create a RAID disk that contains

partitions on that disk, you must rst start up your computer from another disk or the Mac OS X installation

disc.

1. Open Disk Utility, in the Utilities folder.

2. Select one of the disks that you want in the set, and then click RAID.

3. Click Add (+), and type a name for the RAID set.

4. Choose a format from the Format pop-up menu, and then choose Mirrored RAID Set from the RAID

Type pop-up menu.

5. Drag the disks you want to add to the set to the list on the right.

6. For each disk, select it, and then choose its type from the RAID Type pop-up menu.

• To use the disk as a mirror at all times, choose RAID Slice.

• To use the disk as a mirror only when another disk fails, choose Spare. A disk can be a spare in only

one RAID set.

If a disk in the set fails and you have no spares, you must add a new disk to the RAID set in Disk Utility

to return to the original number of disks.

7. To rebuild disks automatically when they’re disconnected then reconnected, click the Options button,

select RAID Mirror AutoRebuild, and then click OK.

If you don;t choose to rebuild disks automatically, you must rebuild them yourself in Disk Utility.

8. Click Create.

Delete A rAiD set

You can delete a RAID set if you want to use it for another task.

To remove a disk from a striped RAID set or concatenated disk set, you must delete the set rst. You can

remove disks from a mirrored RAID set without deleting it.

Always back up any important les before you delete the set. Deleting a striped RAID set or concatenated

diskseterasesallthedisksinit.Deletingaversion2.0mirroredRAIDsetleavesacopyoftheset’slesone

each disk, but you should back up important les as a precaution.

1. Back up any important les.

2. Open Disk Utility, in the Utilities folder.

3. Select a disk in the set you want to delete, and click RAID.

4. Select the RAID set.

5. If you’re deleting a mirrored set and you see a Convert button, click it to convert the RAID set from a

version1.0toaversion2.0.

6. Click Delete.

iF a raid Set FailS

Disk Utility monitors the status of the disks in a RAID set. If you see a message that a disk is missing or

has failed, there are several things you can try to solve the problem.

• If a disk is missing, make sure it’s connected to power, turned on, and connected to your computer.

You might need to disconnect and reconnect it.

• Use the First Aid pane to repair the RAID set.

• In some cases, you might need to quit and reopen Disk Utility or restart your computer, and then

check the RAID set.

• If yo are using a striped RAID set, delete the damaged RAID set. Your data will be lost. Be sure to back

up the disks in your RAID set and other data regularly.

• If you have a persistent problem with a disk in a mirrored RAID set, you may need to replace it. Aer

you the damaged disk, click Rebuild to rebuild the RAID set.

reBUild a mirrored raid Set

If the AutoRebuild option is not used, it will be necessary to rebuild a mirrored RAID set when the J4 is

restarted or reconnected. Follow these instructions to initiate a rebuild of a mirrored RAID set.

1. Open Disk Utility, in the Utilities folder.

2. Select the RAID set and click RAID.

3. Click Rebuild.

comBine raid SetS

Combine dierent RAID sets to combine their benets. For example, create two equal sized striped RAID

(RAID0)disks,thenusethesetwoRAID0diskstocreateamirroredRAID(RAID1)set.istypeof

combinedRAIDcongurationisknownasRAID10becauseitcombinesthespeedofRAID0withthe

redundancyofRAID1.

FirstcreatethesmallerRAID0sets,thencreateaRAID1setfromthetwoRAID0sets.Notethatbefore

theRAID0setscanbeusedtocreatetheRAID1set,theyeachmustrstbeunmounted.

SeetheexamplebelowforinstructionstosetupaRAID10congurationusing4identicalharddisks.

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Promise Technology Pegasus J4 User Manual Page 19

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