I have tried to get support through the web site and email, and it has been slow at best. So I figure why not try the forums while I wait!
I have an HA Starwind SAN running 5.6 and am having problems with the Hyper-V VM's running on this cluster running TERRIBLE. I don't know if it is 5.6 specifically or something wrong in my setup. I will try to cover all the bases below...
-4 new HP DL Servers (2 HA nodes/2 Hyper-V cluster nodes)
-3 separate raid arrays (won't get into details because the problem as you will see below is the DIFFERENCE between native performance on an HA node and through Starwind from a cluster node)
-All bonded Intel Gigabit ET NIC's throughout
-HP E5500 Switches (x2 ring stacked, bonds separated between each switch)
-5.6 running 6 HA targets (1 Quorum/5 storage) 512MB Write Cache on each
-All new cabling
-2008 R2 all around
-TCP Tweaks in forum performed all around
-ntttcp tests all directions (SAN/SYNC/SYNC2) between HA nodes and Cluster to HA 890 to 930 Mbs (while in slight use)
-IOMETER below (including a single side RAM disk for testing purposes) (IOPS/MBs/Access)
-Tests were top to bottom as follows.... Inside Hyper-V VM running on direct attached SATA/direct attached SATA without Hyper-V/direct attached SSD/local on SATA array directly on Starwind HA node/directly on Quorum disk through cluster host's SAN access without CSV's/same but on RAM disk/and then the final inside a Hyper-V VM running inside the HA storage
-As you can see the big problem is the difference in performance between 4 and 5. Once it runs through iSCSI we drop 2-6 times in speed. (which only gets worse inside test 7) I don't know if it could be 5.6 or one of the TCP tweaks (which I had never performed before)
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256 100% sequential, 100% write
SATA Hyper-V 124/31/16
SATA DAS 154/38/13
SSD DAS 406/102/5
SAN/SATA Local 529/132/3.7
SAN HA Direct 95/24/21
SAN HA RAM 207/52/9.6
SAN HA Hyper-V 34/8.6/58 (132/33/15)
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4K 50/50 50/50
SATA Hyper-V 181/.7/11
SATA DAS 181/.7/11
SSD DAS 2156/8.4/1
SAN/SATA Local 420/1.6/4.7
SAN HA Direct 150/.6/13.3
SAN HA RAM 1121/4.4/1.7
SAN HA Hyper-V 147/.6/13.6
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32K 50/50 50/50
SATA Hyper-V 159/5/13
SATA DAS 171/5.3/12
SSD DAS 1277/40/1.5
SAN/SATA Local 340/10.6/5.8
SAN HA Direct 186/5.8/10.7
SAN HA RAM 361/11.3/5.5
SAN HA Hyper-V 258/8/7.7