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drinstall.properties file in DX Netops 20.2 has two new options related to SSD's

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Article ID: 199617

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Updated On:

Products

CA Infrastructure Management CA Performance Management - Usage and Administration DX NetOps

Issue/Introduction

I see two new options in the drinstall.properties file in DX Netops 20.2 version. What are these ?

# Override drive scheduler

# If set to false, drive type will be determined per drive and the scheduler will

# be set based on /sys/block/DRIVE/queue/rotational value

overrideDriveScheduler=false

 

# noop (best for SSDs) or deadline (best for HDs)

overrideDriveSchedulerType=noop

 

Environment

Release : 20.2

Component : CA Performance Center

Resolution

The changes were introduced for optimizing vertica performance and determine the underlying storage. We are not leaving the decision to the system on determining

what storage is being used rather than enforcing it using the below settings.


These settings are more relevant to SSD's

# be set based on /sys/block/DRIVE/queue/rotational value

overrideDriveScheduler=false

rotational

Traditional hard disks have been rotational (made up of spinning platters). SSDs, however, are not. Most SSDs will advertise this properly. If, however, you come across a device that does not advertise this flag properly, it may be necessary to set rotational to 0 manually; when rotational is disabled, the I/O elevator does not use logic that is meant to reduce seeks, since there is little penalty for seek operations on non-rotational media.

# noop (best for SSDs) or deadline (best for HDs)

overrideDriveSchedulerType=noop

If the disk is SSD recommended scheduler is noop


Additional Information

Reference -

https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/InstallationGuide/BeforeYouInstall/IOScheduling.htm