Qsan XS5224D User Manual page 164

Figure 8-31
7. Volume advanced settings can also be configured optionally in this step:
。 Block Size: The options are 512 Bytes to 4,096 Bytes.
。 Priority: The options are High, Medium, and Low. The priority compares to other
volumes. Set it as High if the volume has many I/O.
。 Background I/O Priority: The options are High, Medium, and Low. It will influence
volume initialization, rebuild, and migration.
。 Erase Volume Data: This option is available when the pool is thick provisioning. This
option will wipe out old data in volume to prevent that OS recognizes the old
partition. The options are Do Not Erase, Fast Erase which will erase the first 1GB
data of the volume, or Full Disk which will erase entire volume.
。 Enable Cache Mode (Write-back Cache): Check to enable cache mode function of
volume. Write back optimizes the system speed but comes with the risk where the
data may be inconsistent between cache and disks in one short time interval.
。 Enable Video Editing Mode: Check to enable video editing mode function. It is
optimized for video editing usage. Please enable it when your application is in video
editing environment. This option provides a more stable performance figure without
high and low peaks but slower in average.
。 Enable Read-ahead: Check to enable the read ahead function of volume. The system
will discern what data will be needed next based on what was just retrieved from
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Create a Volume in Thick Provisioning Pool Step 2