CLI Guide

Value Description
2
Data is flushed after 2 s.
5
Data is flushed after 5 s.
10
Data is flushed after 10 s.
20
Data is flushed after 20 s.
60
Data is flushed after 60 s (1 min.).
120
Data is flushed after 120 s (2 min.).
300
Data is flushed after 300 s (5 min.).
1200
Data is flushed after 1200 s (20 min.).
3600
Data is flushed after 3600 s (1 hr).
Infinite
Data in cache is not subject to any age or time
constraints. The data is flushed based on other
criteria that are managed by the RAID controller
module.
Cache Without Battery Enabled
Write caching without batteries enables write caching to continue if the RAID controller module batteries
are completely discharged, not fully charged, or not present. If you set this parameter to TRUE without an
uninterruptible power supply (UPS) or other backup power source, you can lose data if the power to the
storage array fails. This parameter has no effect if write caching is disabled.
Modification Priority
Modification priority defines the amount of system resources that are used when modifying virtual disk
properties. If you select the highest priority level, the virtual disk modification uses the most system
resources, which decreases the performance for host data transfers.
Cache Read Prefetch
The cacheReadPrefetch parameter enables the RAID controller module to copy additional data blocks
into cache while the RAID controller module reads and copies data blocks that are requested by the host
from the physical disk into cache. This action increases the chance that a future request for data can be
fulfilled from cache. Cache read prefetch is important for multimedia applications that use sequential
data transfers. The configuration settings for the storage array that you use determine the number of
additional data blocks that the RAID controller module reads into cache. Valid values for the
cacheReadPrefetch parameter are TRUE or FALSE.
Segment Size
The size of a segment determines how many data blocks that the RAID controller module writes on a
single physical disk in a virtual disk before writing data on the next physical disk. Each data block stores
512 bytes of data. A data block is the smallest unit of storage. The size of a segment determines how
many data blocks that it contains. For example, an 8 KB segment holds 16 data blocks. A 64 KB segment
holds 128 data blocks.
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