How to Cre­ate a disk set in Sierra

Mac Format - - APPLE SKILLS -

1 Cre­ate a disk set

Con­nect to your Mac all of the disks you want to be part of the disk set. For safety, disconnect other disks that won’t be part of the set to en­sure you don’t ac­ci­den­tally erase their con­tents in this process. Choose File > RAID As­sis­tant.

4 Choose disks for the set

Disks and vol­umes are or­gan­ised much like they are in the left pane of Disk Util­ity’s main win­dow, with vol­umes in­dented slightly un­der the disk they are on. Click the check­boxes next to each disk you want to in­clude in the set.

7 Chunk size (striped sets)

With a striped set, chunks of data that make up each file are spread across the disks. If you chose this type for faster trans­fers, a smaller chunk size is more ef­fi­cient; one disk can read a small chunk while another looks for the next one.

2 Choose a set type

You’ll be shown three de­scrip­tions, cor­re­spond­ing to those on the fac­ing page, of the three types of disk set you can cre­ate and man­age us­ing Disk Util­ity. Select the type you want to cre­ate, then click the Next but­ton.

5 Set each disk’s role

Each disk in a mir­rored set must be des­ig­nated as a RAID slice, to con­tain your data (two min­i­mum), or a spare. Spares are op­tional but of­fer some ex­tra protection; they are used to re­build a set if a slice be­comes in­ac­ces­si­ble. Click Next.

8 Chunk size (mir­rored)

In a mir­rored set, pick a large chunk size if it’ll store videos or other big files, or a smaller one for sim­pler files. With ‘Au­to­mat­i­cally re­build’ on, if a disk fails or is re­moved, the set is re­built us­ing a spare; a re­con­nected disk then be­comes a spare.

3 Re­view avail­able disks

You’ll be pre­sented with a list of all the disks con­nected to your Mac, and the vol­umes on them. Your startup disk will be dimmed as it can’t be used. To aid in their iden­ti­fi­ca­tion, each one’s con­nec­tion type and ca­pac­ity are also listed.

6 Set disk set prop­er­ties

You need as­sign a name to your disk set, which is what will be shown in Finder. Of the two choices of­fered for the set’s for­mat, the most com­mon one to choose is Mac OS Ex­tended (Jour­naled) – that is, the one that isn’t case-sen­si­tive.

9 Fin­ish cre­at­ing the set

Click Cre­ate, then Done. In Finder, the set acts like a reg­u­lar disk. To check its sta­tus, such as dur­ing re­build­ing of a mir­rored set, select it un­der RAID Sets in Disk Util­ity’s left pane. You can later add more slices or spares to a mir­rored set.

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