Performance issue with Proxmox 4.1 (updated) - high IO delay

[noname]

hello to all proxmox users,
just install fresh proxmox 4.1 (ext4) of course last updates etc, move some vms to test and we release that it has a huge delay
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root@node2:~# pveversion
pve-manager/4.1-22/aca130cf (running kernel: 4.2.8-1-pve)
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root@node2:~# pveperf /datastore/
CPU BOGOMIPS: 153929.76
REGEX/SECOND: 164554
HD SIZE: 7156.91 GB (/dev/mapper/pve-data)
BUFFERED READS: 359.75 MB/sec
AVERAGE SEEK TIME: 10.45 ms
FSYNCS/SECOND: 1169.77
DNS EXT: 66.95 ms
DNS INT: 5.26 ms ()

we use dell servers with ddr4 memory 128gb and above, raid 10 sata disks with raid controller p730mini with 2gb cache
also for your information
we have proxmox 3.4 (ext4) with a lot vms and we don't have any problem so far.

any information how to troubleshooting help a lot

regards

 

[noname]

maybe it is a reason ?

lspci | grep -i raid
01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS-3 3108 [Invader] (rev 02)
i use the raid controller Dell PERC H730P Mini
why proxmox don't recognize as is ;