lsarrayrecommendation

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Use the lsarrayrecommendation command to view a recommended configuration for the specified drive class and number of drives.

Syntax

Parameters

-driveclass drive_class_id_list

(Required) Specifies the drive class, or classes, for which the array recommendation is made. You must specify at least 1 drive_class_id_list value. You can specify a total of 32 drive_class_id_list values on a single command; however, you must separate each value with a colon character (:).

-drivecount drive_count_list

(Required) Specifies the number of drives for which to make recommendation. You must specify at least 1 drive_count value. You can specify a total of 32 drive_count values on a single command; however, you must separate each value with a colon character (:).

Remember: Each drive_count value must be a numerical value between 2 and 128 (only redundant arrays are considered).

-nohdr

(Optional) By default, headings are displayed for each column of data in a concise style view, and for each item of data in a detailed style view. The -nohdr parameter suppresses the display of these headings.

Note: If there is no data to be displayed, headings are not displayed.

-filtervalue attribute=value

(Optional) Specifies a list of one or more filter attributes that match the specified values; see -filtervalue? for the supported attributes.

Note: Some filters allow the use of a wildcard; the following rules apply when using a wildcard character:

The wildcard character is an asterisk (*).
The command can contain a maximum of one wildcard, which must be the first or last character in the string.
You must enclose the filter entry within double quotation marks ("").

-filtervalue?

(Optional) Includes all of the valid filter attributes in the report. The following filter attributes are valid for the lsarrayrecommendation command:

raid_level
distributed

Any parameters that are specified with the -filtervalue? parameter are ignored.

For more information about filtering attributes, see Attributes of the -filtervalue parameters.

-delim delimiter

(Optional) By default, in a concise view all columns of data are space-separated, with the width of each column set to the maximum width of each item of data. In a detailed view, each item of data is an individual row, and if you display headers, the data is separated from the header by a space. The -delim parameter overrides this behavior. Valid input for the -delim parameter is a 1-byte character. Enter -delim : on the command line. The colon character (:) separates all items of data in a concise view (for example, the spacing of columns does not occur). In a detailed view, the specified delimiter separates the data from its header.

-mdiskgrp mdiskgrp_id | mdiskgrp_name

(Required) Specifies the ID or name of the pool for which to make the recommendation.

Description

This command displays the system-recommended array configuration for a specific drive class and number of drives.

Note: lsarrayrecommendation will report no recommendation of an additional distributed RAID array of compressing drives of any drive class such as IBM FCM drives in case of an existing distributed RAID array of compressing drives in the same storage pool.

You can expand an existing distributed RAID array or can create a new distributed RAID array in a new storage pool or in an existing storage pool which does not contain existing distributed RAID array of compressing drives.

This table provides the attribute values that can be displayed as output view data.

Table 1. lsarrayrecommendation output
Attribute	Possible Values
mdiskgrp_id	Indicates the MDisk group ID.
mdiskgrp_name	Indicates the MDisk group name.
drive_class_id	Indicates the drive class ID for the recommendation.
raid_level	Indicates the recommended RAID level.
distributed	Indicates whether the array is a distributed array recommendation.
min_stripe_width	Indicates the stripe width minimum.
max_stripe_width	Indicates the stripe width maximum.
stripe_width	Indicates the recommended stripe size for this storage pool.
rebuild_areas	Indicates the recommended number of rebuild areas.
strip_size	Indicates the recommended strip size for this storage pool.
drive_count	Indicates the number of drives to configure per array.
array_count	Indicates the number of arrays that can be created at the recommended drive count.
capacity	Indicates the expected usable capacity for virtualization for the array or arrays.

Note: The default recommendation for each drive class is the first row that is listed in the output for that drive class. All other rows for each drive class are not sorted by order of recommendation.

An invocation example

Making a recommendation for more rebuild areas and larger stripe width because there are other existing arrays in the MDisk group:

lsarrayrecommendation -driveclass 2 -drivecount 60 dist_pool

The detailed resulting output:

mdisk_grp_id mdisk_grp_name drive_class_id raid_level distributed min_stripe_width max_stripe_width stripe_width rebuild_areas strip_size drive_count array_count capacity
0            dist_pool      2              raid6      yes         5                16               12           3             256        60          1           255.2TB

An invocation example

Making a recommendation for a new (empty) storage pool and with a row for each raid level:

lsarrayrecommendation -driveclass 2 -drivecount 80 mdiskgrp0

The detailed resulting output:

 mdisk_grp_id mdisk_grp_name drive_class_id raid_level distributed min_stripe_width max_stripe_width stripe_width rebuild_areas strip_size drive_count array_count capacity
   0            mdiskgrp0      2              raid6      yes         5                16               12           3             256        40          2           400.1TB

An invocation example

Making a recommendation for multiple drive classes for a new (empty) storage pool:

lsarrayrecommendation -driveclass 3:5 -drivecount 80:24 mdiskgrp0

The detailed resulting output:

 mdisk_grp_id mdisk_grp_name drive_class_id raid_level distributed min_stripe_width max_stripe_width stripe_width rebuild_areas strip_size drive_count array_count capacity
  0            mdiskgrp0      3              raid6      yes         5                16               12           3             256        40          2           480.4TB
  0            mdiskgrp0      3              raid1      no          2                16               2                          256        10          8           400.6TB
  0            mdiskgrp0      3              raid6      no          5                16               10                         256        10          7           480.6TB
  0            mdiskgrp0      5              raid6      yes         5                16               12           3             256        12          2           180.7TB
  0            mdiskgrp0      5              raid1      no          2                16               2                          256        8           3           100.2TB
  0            mdiskgrp0      5              raid6      no          5                16               12                         256        12          2           180.2TB

An invocation example

Making a recommendation to choose between performance and capacity optimization of the RAID array:

lsarrayrecommendation -driveclass 0 -drivecount 6 0

The detailed resulting output:

mdisk_grp_id mdisk_grp_name drive_class_id raid_level distributed min_stripe_width max_stripe_width stripe_width rebuild_areas strip_size drive_count array_count capacity
  0            mdiskgrp0      0              raid6      yes         5                16               5            1             256        6           1           5.2TB
  0            mdiskgrp0      0              raid1      yes         2                2                2            1             256        6           1           4.4TB