D-Link DSN-6410 User Manual for DSN-6410 - Page 121

Replication configuration, Snapshot space, Threshold, Restart the task an hour later if failed,

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Figure 5.11.21 There are three settings in the Replication configuration menu, Figure 5.11.22 "Snapshot space" specifies the ratio of snapshot space allocated to the source virtual disk automatically when the snapshot space is not configured in advance. The default ratio is 2 to 1. It means when the replication job is creating, the IP SAN storage will automatically use the free space of RAID group to create a snapshot space which size is double of the source virtual disk. "Threshold" setting will monitor the utilization of snapshot space. When the used snapshot space achieves the threshold, the IP SAN storage will automatically take a new snapshot and start the replication job. The purpose of threshold is to prevent the incremental copy fail immediately when running out of snapshot space. For example, the default threshold is 50%, and the system will check the snapshot space every hour. When the snapshot space is used over 50%, the IP SAN storage will automatically replicate data from the source virtual disk to the target virtual disk. Next time, when the rest snapshot space has been used over 50%, in other words, the total snapshot space has been used over 75%, the IP SAN storage will start the replication job again. "Restart the task an hour later if failed" setting is used when running out of snapshot space, the replication job will stop because there is no more available snapshot space. If this option has been check, the IP SAN storage will automatically clear the snapshots to release snapshot space, and the replication job will restart the task after an hour. Caution These two settings, "Threshold" and "Restart the task an hour later if failed", will take effect only when the replication job is configured to run by schedule. 121

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Figure 5.11.21
There are three settings in the
Replication configuration
menu,
Figure 5.11.22
“Snapshot space”
specifies the ratio of snapshot space allocated to the source virtual
disk automatically when the snapshot space is not configured in advance. The default ratio
is 2 to 1. It means when the replication job is creating, the IP SAN storage will
automatically use the free space of RAID group to create a snapshot space which size is
double of the source virtual disk.
“Threshold”
setting will monitor the
utilization of snapshot space. When the used
snapshot space achieves the threshold, the IP SAN storage will automatically take a new
snapshot and start the replication job. The purpose of threshold is to prevent the
incremental copy fail immediately when running out of snapshot space. For example, the
default threshold is 50%, and the system will check the snapshot space every hour. When
the snapshot space is used over 50%, the IP SAN storage will automatically replicate data
from the source virtual disk to the target virtual disk. Next time, when the rest snapshot
space has been used over 50%, in other words, the total snapshot space has been used
over 75%, the IP SAN storage will start the replication job again.
“Restart the task an hour later if failed”
setting is used when running out of snapshot
space, the replication job will stop because there is no more available snapshot space. If
this option has been check, the IP SAN storage will automatically clear the snapshots to
release snapshot space, and the replication job will restart the task after an hour.
Caution
These two settings,
“Threshold”
and
“Restart the task an hour later if
failed”
, will take effect only when the replication job is configured to run
by schedule.