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NS0-157 · Question #417

What will the storage aggregate create -aggregate aggr0_rg0 -diskcount 40 -maxraidsize 20 -nodes cl-01 -disktype SAS command do?

The correct answer is A. It creates a new aggregate named aggr0_rg0 with two RAID-DP RAID groups of 20 SAS drives. When -diskcount exceeds -maxraidsize, ONTAP divides disks evenly across multiple RAID groups, defaulting to RAID-DP for SAS disk types.

Storage Provisioning and Management

Question

What will the storage aggregate create -aggregate aggr0_rg0 -diskcount 40 -maxraidsize 20 -nodes cl-01 -disktype SAS command do?

Options

  • AIt creates a new aggregate named aggr0_rg0 with two RAID-DP RAID groups of 20 SAS drives
  • BIt creates a new aggregate named aggr0_rg0 with one RAID-DP RAID group of 40 SAS drives on
  • CIt creates a new aggregate named aggr0_rg0 with two RAID4 RAID groups of 20 SAS drives on
  • DIt creates a new aggregate named aggr0_rg0 with two RAID4 RAID groups of 20 SAS drives on

How the community answered

(43 responses)
  • A
    84% (36)
  • B
    2% (1)
  • C
    5% (2)
  • D
    9% (4)

Why each option

When -diskcount exceeds -maxraidsize, ONTAP divides disks evenly across multiple RAID groups, defaulting to RAID-DP for SAS disk types.

AIt creates a new aggregate named aggr0_rg0 with two RAID-DP RAID groups of 20 SAS drivesCorrect

With -diskcount 40 and -maxraidsize 20, ONTAP creates two RAID groups each containing 20 SAS disks. Because no -raidtype is specified and the disk type is SAS, ONTAP applies the default RAID-DP policy, resulting in two RAID-DP RAID groups of 20 drives each on node cl-01.

BIt creates a new aggregate named aggr0_rg0 with one RAID-DP RAID group of 40 SAS drives on

A single RAID group of 40 drives is impossible here because the -maxraidsize 20 parameter enforces a hard cap of 20 disks per RAID group, requiring ONTAP to split the 40 disks across multiple groups.

CIt creates a new aggregate named aggr0_rg0 with two RAID4 RAID groups of 20 SAS drives on

RAID4 is not the default RAID type for SAS drives in ONTAP - RAID-DP is the default for SAS/FC disk types, so two RAID4 groups would not be created unless explicitly specified with -raidtype raid4.

DIt creates a new aggregate named aggr0_rg0 with two RAID4 RAID groups of 20 SAS drives on

This option is functionally identical to C and is wrong for the same reason: the default RAID type for SAS aggregates is RAID-DP, not RAID4, when -raidtype is omitted from the command.

Concept tested: ONTAP aggregate creation with maxraidsize and RAID-DP default

Source: https://docs.netapp.com/us-en/ontap/disks-aggregates/create-aggregates-manual-task.html

Topics

#aggregate creation#RAID groups#RAID-DP#maxraidsize

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