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Copyright@2004~2014 Qsan Technology, Inc. All Rights Reserved.
Qsan Document – User Manual
the RG.
Degraded: At least one disk from the RG of the Virtual disk is failed
or plugged out.
Failed: the RAID group disk of the VD has single or multiple failed
disks than its RAID level can recover from data loss.
Partially optimal: the virtual disk has experienced recoverable read
errors. After passing parity check, the health will become Optimal.
R %
Ratio (%) of initializing or rebuilding.
RAID
RAID level.
LUN #
Number of LUN(s) that virtual disk is attached.
Snapshot
space
(GB) or (MB)
The virtual disk size that is used for snapshot. The number means Used
snapshot space / Total snapshot space. The unit can be displayed in GB or
MB.
Snapshot #
Number of snapshot(s) that have been taken.
RAID Group
The RAID group name of the virtual disk.
The options are available on this tab:
Create:
Create a virtual disk.
Cloning Options:
Set the clone options. Detail is described in chapter 5.
The options are available after creating a virtual disk:
▼
-> Extend:
Extend the virtual disk capacity.
▼
-> Set SSD Caching:
Set SSD caching for the virtual disk. Detail is described in chapter 5.
▼
-> Verify Parity:
Execute parity check for the virtual disk. It supports RAID 3 / 5 / 6 / 30 /
50 / 60. The options are:
。
Verify and repair data inconsistencies.
。
Only verify for data inconsistencies. Stop verifying when 1 10 20 30 40 50 60 70 80
90 100 inconsistencies have been found.
▼
-> Delete:
Delete the virtual disk.
▼
-> Set Properties:
Change the virtual disk name, cache mode, priority, bg rate, read-ahead,
AV-media mode, and type.
。
Cache Mode:
Write-through Cache: A caching technique in which the completion of a write
request is not signaled until data is safely stored in non-volatile media. Each data
is synchronized in both data cache and accessed physical disks.
Write-back Cache: A caching technique in which the completion of a write
request is signaled as soon as the data is in cache and actual writing to non-
volatile media occurs at a later time. It speeds up system write performance but
needs to bear the risk where data may be in consistent between data cache and
the physical disks in one short time interval. (Default)
Read-Only: Set the volume to be read-only, any write request is forbidden.
。
Priority:
