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"time we got 50K read IOPS and 30K write IOPS" I am not sure if it is possible at all :) You can never get 50k IOPS on a single VM without multiple disks attached. Again, this is normal / expected behaviour by design (covered by multiple guidances, for example MS SQL on Nutanix Best Practices) Probably, your tests were incorrect (RAM cache used, etc). Again, in case you don't have any issues with NFS-mounted contaner (+ our diagnostics VM runs fine / showing perfect perfromance), it means that something wrong with a guest VM configuration. It is also possible that you've got some flapping / network problem. The only fast way to fix this issue is to open a support case. Obviosly, the situation is not normal.
In fact, in case our diagnostics VM runs fine, the issue is probably related to your guest VM configuration. Multiple vdisks should be attached (they can be unified with LVM for example) to get more performance from VM's, as Nutanix OS limiting oplog size per vdisk (to avoid "noisy neighbour" problem) In fact you can look inside of our diagnostic VM (password is the standard one), it's Centos 6.5. There are multiple vdisks connected and manged by LVM. This way you can get much better performance - 15-20kIOPS per single VM. It is not nessesary to use VMware paravirtual adapter for Linux VM's, standart SCSI / SAS will work fine.
Hi Clearly, it's a configuration issue. 6x3050 nodes should give you at least 120000 / 60000 random IOPS (hot tier). Please open support case, definetely we will help you to fix the problem.
Another way - dump iscsi disks, something like dd if=/dev/disk/by-path/ip-192.168.5.2:3260-iscsi-iqn.2010-06.com.nutanix:hadoop-n001-disk1-1e386ef0-lun-0 of=/mnt/hadoop-n001.d1.img bs=1M You can easely find all disks to backup from KVM host, something like [root@NTNX-13SMxxxxxx-A mnt]# ls /dev/disk/by-path/*hadoop-n001*/dev/disk/by-path/ip-192.168.5.2:3260-iscsi-iqn.2010-06.com.nutanix:hadoop-n001-cdrom-centos-6.5-x86_64-minimal.iso-70648f54-lun-0/dev/disk/by-path/ip-192.168.5.2:3260-iscsi-iqn.2010-06.com.nutanix:hadoop-n001-disk0-b3104834-lun-0/dev/disk/by-path/ip-192.168.5.2:3260-iscsi-iqn.2010-06.com.nutanix:hadoop-n001-disk1-1e386ef0-lun-0
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