Hyper-V Replication over Dedicated LAN and "is alive" checks over Corporate LAN

I am testing Hyper-V replication to see if it will be a suitable replacement for the ArcServer RHA product. One thing I am struggling with is configuring the replication to use the dedicated LAN, but still have the host servers verify over the corporate
LAN.
I have seen the blogs on how to use a dedicated route and editing the hosts file to get replication to use the dedicated LAN, but that also changes the LAN in which the host servers communicate. It seems to me that if the corporate LAN were to go down
on the master server, I wouldn't be able to fail over the virtual machines to the replica server without first having to connect into the master server through the dedicated LAN of the replica server to shut down the virtual machines.
I need to be able to fail over to the replica server if the corporate network connection on the master server drops without having to go through the extra steps of connecting into the master server first.
Is it possible for the two items to be separated? Can I tell Hyper-V to replicate using one specific IP destination on the dedicated LAN and have the replica server check to see if the master is live over the corporate LAN?

Hi Telrick,
>> It seems to me that if the corporate LAN were to go down on the master server, I wouldn't
be able to fail over the virtual machines to the replica server without first having to connect into the master server through the dedicated LAN of the replica server to shut down the virtual machines.
I want to say that there are "planned fail over" and "unplanned fail over " , the latter applies the primary server crashing (you can select "failover" on "replica server " then the VM will start up ,after the primary
server online again you can do "reverse" )
The point is that you can not use hyper-v replica as a backup (it will lost little data which have not yet been replicated to replica server when "unplanned fail over" happens )
Best Regards
Elton Ji
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are trying to better understand customer views on social support experience, so your participation in this
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Vincent Sprague
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Our current system for a bit of background:
3x Clustered Hyper-V Servers running Server 2008 R2 (72TB Ram, dual cpu etc...)
1x Dell MD3220i iSCSI with dual 1GB connections to each server (24x 146GB 15k SAS drives in RAID 10) - Tier 1 storage
1x Dell MD1200 Expansion Array with 12x 2TB 7.2K drives in RAID 10 - Tier 2 storage, large vm's, files etc...
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1x DPM 2012 SP1 Backup server with its own storage.
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Storage performance during backups and large file syncronisations (DPM)
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Tier 2 storage is massively underused (6tb of 12tb Raid 10 space)
Migrating to 10GB server links.
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Purchase a new JBOD SAS array and leverage the new Storage Spaces and SSD caching/tiering capabilities. Use our existing 2TB drives for capacity and purchase sufficient SSD's to replace the 15k SAS disks.
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Is it supported to use storage spaces directly connected to a Hyper-V cluster? I have seen that for our setup we are on the verge of requiring a separate SOFS for storage but the extra costs and complexity are out of our reach. (RDMA, extra 10GB NIC's
etc...)
When using a storage space in a cluster, I have seen various articles suggesting that each csv will be active/passive within the cluster. Causing redirected IO for all cluster nodes not currently active?
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If the CSV is active/active am I correct in assuming that DPM will backup vm's without causing any re-directed IO?
Will DPM backups of VM's be incremental in terms of data transferred from the cluster to the backup server?
Thanks in advance for anyone who can be bothered to read through all that and help me out! I'm sure there are more questions I've forgotten but those will certainly get us started.
Also lastly, does anyone else have a better suggestion for how we should proceed?
Thanks

Current Plan:
Upgrade the cluster to Server 2012 R2
Install a dual port 10GB NIC team in each server and virtualize cluster, live migration, vm and management traffic (with QoS of course)
Purchase a new JBOD SAS array and leverage the new Storage Spaces and SSD caching/tiering capabilities. Use our existing 2TB drives for capacity and purchase sufficient SSD's to replace the 15k SAS disks.
On to the questions:
Is it supported to use storage spaces directly connected to a Hyper-V cluster? I have seen that for our setup we are on the verge of requiring a separate SOFS for storage but the extra costs and complexity are out of our reach. (RDMA, extra 10GB NIC's
etc...)
When using a storage space in a cluster, I have seen various articles suggesting that each csv will be active/passive within the cluster. Causing redirected IO for all cluster nodes not currently active?
If CSV's are active/passive its suggested that you should have a csv for each node in your cluster? How in production do you balance vm's accross 3 CSV's without manually moving them to keep 1/3 of load on each csv? Ideally I would like just
a single CSV active/active for all vm's to sit on. (ease of management etc...)
If the CSV is active/active am I correct in assuming that DPM will backup vm's without causing any re-directed IO?
Will DPM backups of VM's be incremental in terms of data transferred from the cluster to the backup server?
Thanks in advance for anyone who can be bothered to read through all that and help me out! I'm sure there are more questions I've forgotten but those will certainly get us started.
Also lastly, does anyone else have a better suggestion for how we should proceed?
Thanks
1) You can use direct connection to SAS with a 3-node cluster of course (4-node, 5-node etc). Sure it would be much faster then running with an additional SoFS layer (with SAS fed directly to your Hyper-V cluster nodes all reads and writes would be local
travelling down the SAS fabric and with SoFS layer added you'll have the same amount of I/Os targeting SAS + Ethernet with its huge compared to SAS latency sitting in between a requestor and your data residing on SAS spindles, I/Os overwrapped into SMB-over-TCP-over-IP-over-Etherent
requests at the hypervisor-SoFS layers). Reason why SoFS is recommended - final SoFS-based solution would be cheaper as SAS-only is a pain to scale beyond basic 2-node configs. Instead of getting SAS switches, adding redundant SAS controllers to every hypervisor
node and / or looking for expensive multi-port SAS JBODs you'll have a pair (at least) of SoFS boxes doing a file level proxy in front of a SAS-controlled back end. So you'll compromise performance in favor of cost. See:
http://davidzi.com/windows-server-2012/hyper-v-and-scale-out-file-cluster-home-lab-design/
Used interconnect diagram within this design would actually scale beyond 2 hosts. But you'll have to get a SAS switch (actually at least two of them for redundancy as you don't want any component to become a single point of failure, don't you?)
2) With 2012 R2 all I/O from a multiple hypervisor nodes is done thru the storage fabric (in your case that's SAS) and only metadata updates would be done thru the coordinator node and using Ethernet connectivity. Redirected I/O would be used in a two cases
only a) no SAS connectivity from the hypervisor node (but Ethernet one is still present) and b) broken-by-implementation backup software would keep access to CSV using snapshot mechanism for too long. In a nutshell: you'll be fine :) See for references:
http://www.petri.co.il/redirected-io-windows-server-2012r2-cluster-shared-volumes.htm
http://www.aidanfinn.com/?p=12844
3) These are independent things. CSV is not active/passive (see 2) so basically with an interconnection design you'll be using there's virtually no point to having one-CSV-per-hypervisor. There are cases when you'd still probably do this. For example if
you'd have all-flash and combined spindle/flash LUNs and you know for sure you want some VMs to sit on flash and others (no so I/O hungry) to stay within "spinning rust". One more case is many-node cluster. With it multiple nodes basically fight for a single
LUN and a lot of time is wasted for SCSI reservation conflicts resove (ODX has no reservation offload like VAAI has so even if ODX is present its not going to help). Again it's a place where SoFS "helps" as having intermediate proxy level turns block I/O into
file I/O triggering SCSI reservation conflicts for a two SoFS nodes only instead of an evey node in a hypervisor cluster. One more good example is when you'll have a mix of a local I/O (SAS) and Ethernet with a Virtual SAN products. Virtual SAN runs directly
as part of the hypervisor and emulates high performance SAN using cheap DAS. To increase performance it DOES make sense to create a concept of a "local LUN" (and thus "local CSV") as reads targeting this LUN/CSV would be passed down the local storage
stack instead of hitting the wire (Ethernet) and going to partner hypervisor nodes to fetch the VM data. See:
http://www.starwindsoftware.com/starwind-native-san-on-two-physical-servers
http://www.starwindsoftware.com/sw-configuring-ha-shared-storage-on-scale-out-file-servers
(feeding basically DAS to Hyper-V and SoFS to avoid expensive SAS JBOD and SAS spindles). The same thing as VMware is doing with their VSAN on vSphere. But again that's NOT your case so it DOES NOT make sense to keep many CSVs with only 3 nodes present or
SoFS possibly used.
4) DPM is going to put your cluster in redirected mode for a very short period of time. Microsoft says NEVER. See:
http://technet.microsoft.com/en-us/library/hh758090.aspx
Direct and Redirect I/O
Each Hyper-V host has a direct path (direct I/O) to the CSV storage Logical Unit Number (LUN). However, in Windows Server 2008 R2 there are a couple of limitations:
For some actions, including DPM backup, the CSV coordinator takes control of the volume and uses redirected instead of direct I/O. With redirection, storage operations are no longer through a host’s direct SAN connection, but are instead routed
through the CSV coordinator. This has a direct impact on performance.
CSV backup is serialized, so that only one virtual machine on a CSV is backed up at a time.
In Windows Server 2012, these limitations were removed:
Redirection is no longer used.
CSV backup is now parallel and not serialized.
5) Yes, VSS and CBT would be used so data would be incremental after first initial "seed" backup. See:
http://technet.microsoft.com/en-us/library/ff399619.aspx
http://itsalllegit.wordpress.com/2013/08/05/dpm-2012-sp1-manually-copy-large-volume-to-secondary-dpm-server/
I'd look at some other options. There are few good discussion you may want to read. See:
http://arstechnica.com/civis/viewtopic.php?f=10&t=1209963
http://community.spiceworks.com/topic/316868-server-2012-2-node-cluster-without-san
Good luck :)
StarWind iSCSI SAN & NAS

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This publication has 12 million rows and is very active, with thousands of changes daily.
, The three rows did not replicate a status change from a 5 to a 6.
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I suspect the problem with the new publication/subscriptions not initializing may have been a result of timeouts but it is hard to say for sure. The fact that it eventually succeeded after multiple attempts leads me to believe this. If this happens
again, enable verbose agent logging for the Distribution Agent to see if you are getting query timeouts. Add the parameters
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Regarding the three transactions not replicating, inspect MSrepl_errors in the distribution database for the time these transactions occurred and see if any errors occurred.
Brandon Williams (blog |
linkedin)

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More detailed tutorials are available at http://msdn.microsoft.com/en-us/library/windowsazure/dn440569.aspx

How to turn on both LAN and Wireless T430

I need both my LAN and wireless enabled at the same time. Can I turn them both on using Think Advantage? I believe our IT dept has uninstalled any ThinkAdvantage software. Which ThinkAdvantage software should I download and where do I turn both the wireless and the LAN on at? Thank you

Windows doesn't make it easy for you to have different processes access different networks simultaneously.
You can force it to prioritize one over another as so:https://answers.microsoft.com/en-us/windows/forum/windows_7-networking/wired-and-wireless-connection...
But it's all or nothing; you use either-or.
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

WRT150N (New) Gateway IP stops responding to LAN and wireless clients. Hangs, stops, loss of service

WRT150N Firmware Version: v1.51.3 : From LAN and wireless connected devices, Internet connectivity is lost. I try to ping the LAN side gateway IP address from my laptop and desktop, no response. Web management does not work either. Power re-cycle of the WRT150N fixes the problem. The problem is infrequent, it can happen twice per day or once every 2 days.
When the problem occurs,
the DHCP info in my clients looks fine and shows the correct gateway IP address, mask etc. ;
the desktop and laptop can still ping each other;
The gateway is unreacheable and all out going connectivity is lost
Does anybody have any solution or maybe has had the same experience.
I cannot track the problem happening to any particular event or usage pattern however I am using the Azureus bit torrent client all the time.
I have an incident raised with LinkSys Technical Support but no response so far from them.
WRT150N Firmware Version: v1.51.3

Hi - please go to this thread for more details:
http://forums.linksys.com/linksys/board/message?board.id=Wireless_Routers&message.id=103033#M103033
or search for the other thread started by (fb2k). But briefly over the 1 year period since this thread started my local store replaced my wrt150n 3 times and then gave me a wrt160n which was replaced and its still having the problem. I am now running Open Source wireless software (DD-WRT) on the WRT160N and it has been up 18 days with no restart. I didnt want to do this but I got fed up taking my unit back to the store. Thanks to fb2k (on the other thread) for taking the plunge and reporting success with the DD-WRT software.
Message Edited by NetGuy-Dubai on 08-23-2008 01:06 PM
Message Edited by NetGuy-Dubai on 08-23-2008 01:07 PM

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