sunhux
asked on
Possible to have 5Mbps point to point leased circuit with ping latency of <5ms end to end
EMC SAN sales person told me that as long as the leased circuit
WAN (point to point link) has end to end ping latency of less than
5ms, then it's possible to have SAN replication.
Based on our current log shipping largest file of 50MB & our MS
SQL log ship file is created every 15mins, I deduced that the
peak write IO is 50x1024x1024x8 / 15x60 = 466kbps.
Giving the benefit of doubt that there could be surges in write
IO to the database occasionally, I reckon 5Mbps should be able
to cover the occasional surge in IO.
EMC SAN sales person told me as long as we can get a ping latency
of less than 5ms, this 5Mbps WAN circuit should be able to support
EMC's SRDF (sort of EMC's SAN replication)
Q1:
Anyone has any experience whether a normal IP link (copper)
5Mbps can achieve this ping latency time?
Q2:
Would a "Dark Fiber" 5Mbps link give a much better ping latency
time?
Q3:
If I were to use compression modules on the WAN router, would
it help with the ping latency & help improve the bandwidth utilization?
WAN (point to point link) has end to end ping latency of less than
5ms, then it's possible to have SAN replication.
Based on our current log shipping largest file of 50MB & our MS
SQL log ship file is created every 15mins, I deduced that the
peak write IO is 50x1024x1024x8 / 15x60 = 466kbps.
Giving the benefit of doubt that there could be surges in write
IO to the database occasionally, I reckon 5Mbps should be able
to cover the occasional surge in IO.
EMC SAN sales person told me as long as we can get a ping latency
of less than 5ms, this 5Mbps WAN circuit should be able to support
EMC's SRDF (sort of EMC's SAN replication)
Q1:
Anyone has any experience whether a normal IP link (copper)
5Mbps can achieve this ping latency time?
Q2:
Would a "Dark Fiber" 5Mbps link give a much better ping latency
time?
Q3:
If I were to use compression modules on the WAN router, would
it help with the ping latency & help improve the bandwidth utilization?
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
The current customer's setup is log shipping & even with log ship that's
created every 5 minutes, the customer is not satisfied. I guess I'll have
to achieve something like 1 minute RPO or lower. Unless we can have
an asynchronous SAN replication or log ship that will give lower than 1
minute RPO, the customer is not satisfied
created every 5 minutes, the customer is not satisfied. I guess I'll have
to achieve something like 1 minute RPO or lower. Unless we can have
an asynchronous SAN replication or log ship that will give lower than 1
minute RPO, the customer is not satisfied
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
needed for SAN replication:
http://searchstoragechannel.techtarget.com/feature/Network-bandwidth-Sizing-for-long-distance-storage-networking-applications