Quantum 3.1.4.1 manual Affinities

StorNext File System Tuning

The Metadata Controller System

StripeBreadth 256K

MultiPathMethod Rotate

Node CvfsDisk6 0

Node CvfsDisk7 1

[StripeGroup MetaFiles]

Status UP

MetaData Yes

Journal No

Exclusive Yes

Read Enabled

Write Enabled

StripeBreadth 256K

MultiPathMethod Rotate

Node CvfsDisk0 0

[StripeGroup JournFiles]

Status UP

Journal Yes

MetaData No

Exclusive Yes

Read Enabled

Write Enabled

StripeBreadth 256K

MultiPathMethod Rotate

Node CvfsDisk1 0

Affinities

Affinities are another stripe group feature that can be very beneficial. Affinities can direct file allocation to appropriate stripe groups according to performance requirements. For example, stripe groups can be set up with unique hardware characteristics such as fast disk versus slow disk, or wide stripe versus narrow stripe. Affinities can then be employed to steer files to the appropriate stripe group.

For optimal performance, files that are accessed using large DMA-based I/O could be steered to wide-stripe stripe groups. Less performance- critical files could be steered to slow disk stripe groups. Small files could be steered to narrow-stripe stripe groups.

Example:

[stripeGroup AudioFiles] Status UP

Exclusive Yes ##These two lines set Exclusive stripeGroup ##

10 StorNext File System Tuning Guide