Proware EP-4643S2D2-F8S6, Руководство пользователя

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Fibre to SAS/SATA Disk Array
User Manual 97
Initialization Mode:
Set the Initialization Mode for the Volume Set. Initialization in Foreground mode is
completed faster but must be completed before Volume Set becomes accessible.
Background mode makes the Volume Set instantly available but the initialization process
takes longer. No Init (To Rescue Volume) is used to create a Volume Set without
initialization; normally used to recreate Volume Set configuration to recover data.
Stripe Size:
This parameter sets the size of the stripe written to each disk in a RAID 0, 1, 10, 5 or
6 Volume Set. You can set the stripe size to 4 KB, 8 KB, 16 KB, 32 KB, 64 KB, 128
KB, 256 KB, 512 KB, or 1024 KB.
A larger stripe size produces better-read performance, especially if your computer does
mostly sequential reads. However, if you are sure that your computer does random
reads more often, select a small stripe size.
NOTE: Stripe Size in RAID level 3 ca n’ t be modified.
Cache Mode:
The Disk Array supports two types of write caching: Write-Through and Write-Back.
Write-Through: data are both written to the cache and the disk(s) before the write
I/O is acknowledged as complete.
Write-Back: when data is written to cache, the I/O is acknowledged as complete,
and some time later, the cached data is written or flushed to the disk(s). This
provides better performance but requires a battery module support for the cache
memory, or a UPS for the subsystem.
Tagged Command Queuing:
When this option is enabled, it enhances the overall system performance under multi-
tasking operating systems by reordering tasks or requests in the command queue of
the RAID system. This function should normally remain enabled.
Controller #1 Fibre Port Mapping: Controller #1 has four 8Gbps Fibre Host Channels
(Ports 0, 1, 2, and 3). Select the Fibre Port where to map the LUN (volume Set).
Controller #2 Fibre Port Mapping: Controller #2 has four 8Gbps Fibre Host Channels
(Ports 4, 5, 6, and 7). Select the Fibre Port where to map the LUN (volume Set).
NOTE: The default Port mapping is Port 0 and 4 and provides dual
path to LUN on both controllers. MPIO must be setup in host/server.
NOTE: If LUN is mapped to a Fibre Port on one controller only
(example: Port 0), the cache mirror will be disabled.
NOTE: If LUN is not mapped to any Fibre Port, then LUN is disabled.