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тАО11-24-2009 09:48 AM
тАО11-24-2009 09:48 AM
Lefthand cluster best practices
Is it possible to place one of the two nodes (4500) in a remote DR site and replicate between the nodes?
Is a licence required for replication over different subnets?
With a 2 node cluster it is recommended to install the failover manager away from the SAN for obvious reasons. If you do not have a third site would you install it onto a physical Windows server or create a Windows VM and store on local disks.
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тАО11-25-2009 01:41 AM
тАО11-25-2009 01:41 AM
Re: Lefthand cluster best practices
Latency must be less than 2ms (roundtrip).
No license is required. Everything is included. So you can splitt the 2 nodes over 2 sites.
Best practices is to have FOM (failover manager) on a 3rd location. At least on an independet machine running. FOM runs on VMware Player/Server/ESX.
regards,
reNe
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тАО11-25-2009 02:08 AM
тАО11-25-2009 02:08 AM
Re: Lefthand cluster best practices
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тАО11-25-2009 02:09 AM
тАО11-25-2009 02:09 AM
Re: Lefthand cluster best practices
can remote copy work with any storage as a target?
Arfe there any links for RC?
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тАО11-25-2009 07:46 AM
тАО11-25-2009 07:46 AM
Re: Lefthand cluster best practices
There are not latency requirements for Remote copy snapshots since they are asynchronous. There are bandwidth requirements however. And it varies based on how much data (and how frequently) you snapshot. A good rule of thumb is that a single T1 (1.54Mbps) can replicate about 15GB of data per 24 hours. That is fully saturated, so make sure you won't be competing with other WAN traffic.
>>can remote copy work with any storage as a >>target?
It must be Lefthand SAN/iQ, so that would be another P4xxx SAN module or the P4000 VSA (which can run on any storage that can run as an ESX(i) host). If you want to use the VSA for managed snapshots it must be licensed, or acquired through the included bundle (with the virtualization SAN product)
It sounds like you do NOT have a low latency connection between locations (right?)
If that is the case, and you want to be able to sustain a single storage node failure (and keep critical storage online) at the primary site, you will need to have the 2 SAN modules at 1 location and configure critical volumes with 2-way replication. If in addition to that you want to have off-site snapshots (using remote copy) you will need to purchase a 3rd SAN module, or purchase the VSA license to run on Bring-Your-Own-Storage (this can be run on the free version of ESXi 3 or 4).
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тАО11-26-2009 12:51 AM
тАО11-26-2009 12:51 AM
Re: Lefthand cluster best practices
Yes we have a 10MB link between the sites. We have a 2 node cluster in the HQ and a VSA for the DR site. ESXi is running on the VSA box and will be moved shortly.
Does Primesync work with the VSA so we can replicate data locally before moving?
In this scenario with 2 sites where would you place the FOM? I know I can't put it on the 2 node cluster. The way I see it I have 2 options:
1. put it on local disks on one of the ESX hosts
2. put it on the VSA in the remote DR site
What do you think?
Thanks again
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тАО12-01-2009 05:41 AM
тАО12-01-2009 05:41 AM
Re: Lefthand cluster best practices
We have been designing a LeftHand envionrment that will span multiple sites on a 10G fiber, but I am not positive that we will be able to gurantee 2ms latency.
Thank you,
Kevin
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тАО12-01-2009 10:54 PM
тАО12-01-2009 10:54 PM
Re: Lefthand cluster best practices
The <2ms is the recommendation in average for a Multi-Site Cluster.
The tolerance is around 5ms max.
Best regards,
reNe
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тАО01-13-2010 10:25 AM
тАО01-13-2010 10:25 AM
Re: Lefthand cluster best practices
Thanks.
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тАО01-14-2010 09:21 AM
тАО01-14-2010 09:21 AM
Re: Lefthand cluster best practices
FOM is "FailOver Manager" and is required to maintain Quorum in the event of a node failure in a 2 node cluster.
Both ship with the SAN