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Qsan Document – User Manual
QReplicas
QReplicas function can replicate data easily through LAN or WAN from one system to another.
Here is the replication operation. At the beginning, copy all data from the source virtual disk to
target. It is also called full copy. Afterwards, use snapshot technology to perform the incremental
copy. Please be fully aware that the incremental copy needs to use snapshot to compare the data
difference. Therefore, the enough snapshot space for the virtual disk is very important. Of course,
replication task can also be set as schedule. The following table is the comparison with QReplica
1.0 and 2.0. QReplica 2.0 starts from AegisSAN LX FW 3.2.0 and AegisSAN Q500 FW 1.1.0.
V2.0
V1.0
Replication port
Any iSCSI data port
Specified iSCSI port only
Tasks per controller
AegisSAN LX: 32 tasks
AegisSAN Q500: 16 tasks
8 tasks
MPIO
2 paths per task
2 paths per task
MC/S
4 connections per session
N/A
Traffic shaping
8 traffic shapers can apply to
each task
N/A, max 20 MB/s
Traffic shaping scheduling
Peak and off-peak to apply N/A
VD Clone
Schedule clone
NO
Yes
Start clone
process with
fully copy
Done
Check threshold
every hour
Run out of
snapshot space
Run out of
snapshot space
Manually start
clone by user
Auto delete old
clone snapshot
Manually release
snapshot space
Restart clone
by user
Auto restart an
hour later
