D-Link DSN-626 User Manual - Page 69

> Set SSD Caching, > Set Properties

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D-Link Document - User Manual R % RAID LUN # Snapshot space (GB) or (MB) Snapshot # RAID Group  Optimal: the virtual disk is working well and there is no failed disk in 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. Ratio (%) of initializing or rebuilding. RAID level. Number of LUN(s) that the virtual disk is attached to. The virtual disk size that is used for a snapshot. The number means Used snapshot space / Total snapshot space. The unit can be displayed in GB or MB. Number of snapshot(s) that have been taken. The RAID group name of the virtual disk The options available on this tab are:  Create: Create a virtual disk.  Cloning Options: Set the clone options. Described in detail in chapter 5. These options are available after creating a virtual disk Extend: Extend the virtual disk capacity Set SSD Caching: Set SSD caching for the virtual disk. Described in detail 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 and read ahead. 。 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. 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 nonvolatile media occurs at a later time. It speeds up system write performance but needs to bear the risk where data may be inconsistent 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. Copyright@2014 D-Link System, Inc. All Rights Reserved. 69

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D-Link Document – User Manual
Optimal: the virtual disk is working well and there is no failed disk
in 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 the virtual disk is attached to.
Snapshot space
(GB) or (MB)
The virtual disk size that is used for a 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 available on this tab are:
Create:
Create a virtual disk.
Cloning Options:
Set the clone options. Described in detail in chapter 5.
These options are available after creating a virtual disk:
▼
-> Extend:
Extend the virtual disk capacity.
▼
-> Set SSD Caching:
Set SSD caching for the virtual disk. Described in detail 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 and read
ahead.
。
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. 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 inconsistent 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.
69
Copyright@2014 D-Link System, Inc. All Rights Reserved.