I want to test Microsegmentation on prism central, but "AHV Free Memory Minimum 1GB for each Prism Central VM" showed up. And I can't enable Enable Microsegmentation check box. 20gb memory assigned to prism central. What was the problem ?
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Hey
Please make sure that AHV hosts, where Prism Central VMs are running, have at least 1 Gb of memory free. You can check this on Hardware page in Prism or
If you want to check memory usage from the command line, then check "Memory Free" column in "Hosts" section of Scheduler page on Acropolis master for the particular host where PC-VM is running:
You can get to know the Acropolis master amongst the CVM using the commands mentioned in this KB http://portal.nutanix.com/kb/2305
SSH to the CVM which is the acropolis master and run this command below to go to the Acropolis Links page: cvm$ links http:0:2030/sched <----- on the acropolis master
NOTE: Do not use "free -h", "top", "cat /proc/meminfo" commands, as AHV reserves all free memory and output of these commands will in most cases show that almost no free memory is left.
If there is enough memory available on AHV host, where Prism Central VMs are running, then please make sure that time between Prism Central VMs and Prism Element CVMs is in sync. If time is not in sync, then it needs to be fixed. Flow enablement workflow relies on Prism element statistics stored in IDF, so if time is not synced, we will not be able to query for most recent host memory usage and precheck will fail.
So to troubleshoot NTP issues you can use this awesome KB http://portal.nutanix.com/kb/4519 .
If the issue still persists and you are not clear then you can always go ahead and open a support case with us so that a technical expert can take a closer look and help.
Let me know if you need anything else.
Hey
Let me know if you need help with anything as I would be more than happy to assist. 
The node that showed smallest “Memory free” was 56983MB among four nodes. Ntp server(s) referenced by Prism Central was 127.0.0.1, so I fixed it.
But still “AHV Free Memory Minimum 1GB for each Prism Central VM” showed up, so I rebooted Prism Central.
Then another problem came up… when I look at Prism Central url in my browser, I see "Prism Services have not started yet. Later." and Prism Element's dashboard has "Prism Central – Disconnected". When I logged in to Prism Central with ssh and ran ncli, ncli replied: Connection refuse.
What's going on?
nutanix@NTNX-10-10-13-197-A-PCVM:~$ ncli
Error: Connection refused (Connection refused)
Hey
How long has it been since you rebooted the PC-VM?
Is it up now and are you able to connect to NCLI from PC-VM? Also are you able to manage the PE cluster from PC now, and is the status of PC back to OK on PE cluster dashboard
Can you send me the output of the below commands from PC-VM:
)PC-VM$ ncc health_checks run_all
2)PC-VM$ cs | grep -v UP
Running ncli from PC is still “Connection refused”.
nutanix@NTNX-10-10-13-197-A-PCVM:~$ date; uptime
Mon Jun 29 17:15:11 JST 2020
17:15:11 up 2:10, 2 users, load average: 0.03, 0.21, 0.16nutanix@NTNX-10-10-13-197-A-PCVM:~$ cs | grep -v UP
2020-06-29 17:10:48 INFO zookeeper_session.py:143 cluster is attempting to connect to Zookeeper
2020-06-29 17:10:48 INFO cluster:2784 Executing action status on SVMs 10.10.13.197
2020-06-29 17:10:49 INFO cluster:2935 Success!
The state of the cluster: stop
Lockdown mode: Disabled
CVM: 10.10.13.197 Up, ZeusLeader
SSLTerminator DOWN ]
Medusa DOWN ]
DynamicRingChanger DOWN ]
InsightsDB DOWN ]
InsightsDataTransfer DOWN ]
Ergon DOWN ]
Athena DOWN ]
Prism DOWN ]
AlertManager DOWN ]
Catalog DOWN ]
Atlas DOWN ]
Uhura DOWN ]
SysStatCollector DOWN ]
ClusterConfig DOWN ]
Mercury DOWN ]
APLOSEngine DOWN ]
APLOS DOWN ]
Lazan DOWN ]
Kanon DOWN ]
Delphi DOWN ]
Metropolis DOWN ]
Flow DOWN ]
Magneto DOWN ]
Search DOWN ]
XPlay DOWN ]
KarbonUI DOWN ]
KarbonCore DOWN ]
ClusterHealth DOWN ]
Neuron DOWN ]
nutanix@NTNX-10-10-13-197-A-PCVM:~$ ncc health_checks run_all
-- snip -
nutanix@NTNX-10-10-13-197-A-PCVM:~$ cat /home/nutanix/data/logs/ncc-output-latest.log
-- snip -The results were long, so I'll leave them here.
Thanks for attaching the output
Can you run the below commands and send the output:
1)PC-VM$ cluster startCheck the logs for genesis inside ~/data/logs/genesis.out, and tail them:
2)PC-VM$ tailf /data/logs/genesis.out
Thx. Cluster start command worked. The PC web management screen also works.
But still “AHV Free Memory Minimum 1GB for each Prism Central VM” showed up.
nutanix@NTNX-10-10-13-197-A-PCVM:~$ cluster start
2020-06-29 20:40:47 INFO zookeeper_session.py:143 cluster is attempting to connect to Zookeeper
2020-06-29 20:40:47 INFO cluster:2784 Executing action start on SVMs 10.10.13.197
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: SSLTerminator Medusa DynamicRingChanger InsightsDB InsightsDataTransfer Ergon Athena Prism AlertManager Catalog Atlas Uhura SysStatCollector ClusterConfig Mercury APLOSEngine APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: SSLTerminator Medusa DynamicRingChanger InsightsDB InsightsDataTransfer Ergon Athena Prism AlertManager Catalog Atlas Uhura SysStatCollector ClusterConfig Mercury APLOSEngine APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
-- 15 times --
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: DynamicRingChanger InsightsDB InsightsDataTransfer Ergon Athena Prism AlertManager Catalog Atlas Uhura SysStatCollector ClusterConfig Mercury APLOSEngine APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
-- 19 times --
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Prism AlertManager Catalog Atlas Uhura SysStatCollector ClusterConfig Mercury APLOSEngine APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: APLOSEngine APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: APLOS Lazan Kanon Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Delphi Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Metropolis Flow Magneto Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: Search XPlay KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonUI KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: KarbonCore ClusterHealth Neuron
Waiting on 10.10.13.197 (Up, ZeusLeader) to start: ClusterHealth
Waiting on 10.10.13.197 (Up, ZeusLeader) to start:
The state of the cluster: start
Lockdown mode: Disabled
CVM: 10.10.13.197 Up, ZeusLeader
Zeus UP 5930, 5963, 5964, 5965, 5975, 5992]
Scavenger UP 4277, 4307, 4308, 4309]
SSLTerminator UP 213205, 213233, 213234, 213235]
Medusa UP 213285, 213351, 213352, 213664, 214362]
DynamicRingChanger UP 216931, 216971, 216972, 217434]
InsightsDB UP 216935, 217004, 217005, 217221]
InsightsDataTransfer UP 216939, 217025, 217026, 217122, 217123, 217124, 217125, 217126, 217127, 217128]
Ergon UP 216961, 217053, 217054, 217055]
Athena UP 216994, 217155, 217156, 217157]
Prism UP 217270, 217429, 217430, 217762, 218725, 218790]
AlertManager UP 217306, 217664, 217666, 217783, 223238]
Catalog UP 217352, 217747, 217748, 217749]
Atlas UP 217378, 217514, 217515, 217516]
Uhura UP 217400, 217608, 217609, 217613]
SysStatCollector UP 217418, 217581, 217582, 217588]
ClusterConfig UP 217433, 217623, 217625, 217627]
Mercury UP 217456, 217701, 217702, 217769]
APLOSEngine UP 217580, 217752, 217753, 217754]
APLOS UP 218488, 218583, 218584, 218586, 219144, 219156, 219157]
Lazan UP 218510, 218632, 218633, 218636]
Kanon UP 218533, 218645, 218646, 218647]
Delphi UP 219454, 219488, 219489, 219490]
Metropolis UP 219493, 219572, 219573, 219694]
Flow UP 219528, 219621, 219622, 219623]
Magneto UP 219567, 219637, 219638, 219639]
Search UP 220470, 220543, 220544, 220545, 220555, 220556, 220557, 220792]
XPlay UP 220495, 220586, 220587, 220676]
KarbonUI UP 221512, 221627, 221628]
KarbonCore UP 222947, 222991, 222992]
ClusterHealth UP 222987, 223134, 223135]
Neuron UP 223048, 223178, 223179]
nutanix@NTNX-10-10-13-197-A-PCVM:~$ tailf data/logs/genesis.out
2020-06-29 04:43:25 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:25 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:27 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:27 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:27 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:27 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:27 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:27 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:28 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:28 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:38 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:38 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:38 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:38 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:43 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:43 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:56 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:56 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:56 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:56 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:43:58 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:43:58 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:44:02 INFO zookeeper_session.py:143 genesis is attempting to connect to Zookeeper
2020-06-29 04:44:03 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:44:03 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:44:03 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:44:03 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:44:03 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:44:03 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:44:03 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:44:03 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:44:03 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:44:03 INFO operation_queue.py:145 Operation queue is empty
2020-06-29 04:44:08 INFO framework_updater.py:342 Intent version unset
2020-06-29 04:44:08 INFO operation_queue.py:145 Operation queue is empty
-- snip --
Today, when I selected Microsegmentation on PC, showed “Precheck Successful” in a short time and I was able to 
Enable Microsegmentation.
The reasons for failure related to ntp was not enabled and the cluster startup failed to come up.
Why was PC a little sluggish… that when I first synchronized ntp on PC, time was about 30,000 seconds late (or future, I forget whether it was plus or minus).
But, well, thanks to your help, I can test Microsegmentation.
Hey
Exactly as I said the time between Prism Central VMs and Prism Elementcluster should be in sync. If time is not in sync, then it needs to be fixed. Flow enablement relies on Prism element statistics stored in a service IDF(insights data fabric: it’s a central database for storing metrics and cluster statistics), so if time is not synced, PC will not be able to query for most recent host memory usage/or will fetch wrong memory usage for the host which is not currently correct and precheck will fail.
Anyways, you can definitely reach out to me again in future if you need help with anything else, as I would be more than happy to help again
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