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Important Commands

Nvidia GRID

Show NVIDIA GRID version hostssh "rpm -qa | grep -i nvidia" Installation Check AHV Version: hostssh "grep 'VERSION=' /etc/os-release" Download NVIDIA GRID Package wget "<download-link>" -O <driver-package-name>.tar.gz Install package install_host_package -r /h...

Important Commands

Prism Central Unregister

Normal (PC reachable) Run on a PE CVM while Prism Central is reachable ncli multicluster remove-from-multicluster external-ip-address-or-svm-ips=<PC_IP> Force (PC unreachable / already gone) Run on a PE CVM when Prism Central can't be reached (deleted, network...

Backplane Network Segmentation

Networking Backplane Separation

What it is By default all Controller VM (CVM) traffic shares one interface (CVM eth0): management (Prism, SSH, Rsyslog, SNMP, PE↔PC) and CVM↔CVM cluster-service traffic (Stargate, Cassandra, Zookeeper, Curator) all go out the same NIC and VLAN. Network Segment...

IP Pools

Networking Backplane Separation

Two different "IP pools" — don't mix them up Nutanix reuses the term "IP pool" for two unrelated things. Both come up when you're doing backplane/segmentation work, but they address completely different traffic. Segmentation IP pool AHV VM network IPAM pool Ad...

Storage Pools erklaert

SANsymphony Basics

Storage Pools erklaert Ein Storage Pool buendelt physische Disks zu einem gemeinsamen Kapazitaets-Topf, aus dem die Virtual Disks bedient werden. Solange genug Reserve drin ist, merkt niemand etwas. Solange. SAGT ER HAT NOCH KAPAZITAET 📉 STORAGE POOL BEI 98 PR...

Mirroring for Dummies

SANsymphony Basics

Mirroring for Dummies Synchrones Mirroring schreibt jeden Block auf zwei Knoten gleichzeitig, bevor der Host ein ACK bekommt. Grossartig fuer die Datensicherheit. Weniger grossartig, wenn die Leitung dazwischen aus Bindfaden und Hoffnung besteht. SYNCHRONE SPI...

Node-Zombies

Nodes & Failover

Node-Zombies Manche DataCore-Server sollten laut Asset-Liste seit Jahren ausgemustert sein. Sie laufen trotzdem weiter, ohne Reboot, ohne Patch, ohne Angst vor dem Tod. SERVER SOLLTE LAENGST WEG SEIN 🧟 LAEUFT SEIT 2014 OHNE REBOOT

Failover-Drama

Nodes & Failover

Failover-Drama Ein geplanter Failover-Test ist die einzige Situation, in der eine hochverfuegbare Umgebung zuverlaessig ausfaellt. Murphy liest offenbar den Wartungsplan mit. FAILOVER TEST SORGFAELTIG GEPLANT 😅 PRODUKTION GEHT TROTZDEM OFFLINE

GUI vs. Realitaet

Management Console

GUI vs. Realitaet Die Management Console zeigt ein beruhigendes durchgehendes Gruen. Das Ticketsystem im Nachbartab zeichnet ein etwas anderes Bild der Lage. DASHBOARD ZEIGT ALLES GRUEN 🟢 TICKETSYSTEM STEHT IN FLAMMEN

Lizenzen & Support-Tickets

Management Console

Lizenzen & Support-Tickets Capacity Licensing klingt einfach, bis man versucht auszurechnen, wie viel TiB man in sechs Monaten wirklich braucht. Danach ruft man doch lieber den Support an. CAPACITY LICENSING BERECHNEN 🧮 BRAUCHT MEHR MATHE ALS DIE UNI

Password Management

Usermanagement

Unlock Useraccount allssh sudo faillock --user admin --reset Find Source of Prism Account Lockout Repeated failed Prism logins (e.g. a misconfigured 3rd-party integration) lock the local "admin" account. PE shows "Account locked due to too many failed attempts...

Cluster Status & Config

Cluster & Nodes

Cluster Status Show status of all cluster services on all nodes cluster status nodetool -h 0 ring acli host.list Start cluster services cluster start Show cluster service status cs | grep -v UP Stop cluster services (maintenance only!) cluster stop Cluster Inf...

Shortcuts & Genesis

Cluster & Nodes

Useful Shortcuts Show IPs of all CVMs in the cluster (from a CVM) svmips Show IPs of all AHV hosts hostips Run a command on all CVMs at once allssh "<command>" Run a command on all AHV hosts at once hostssh "<command>"   Genesis Status of Genesis services on t...

Cluster Creation & Upgrades

Cluster & Nodes

Manual Cluster Creation Create the cluster manually from a set of CVM IPs cluster -s x.x.x.x,x.x.x.x,x.x.x.x create Restart Genesis on all hosts (e.g. after imaging/creation issues) cluster restart_genesis Create 2-Node-Cluster cluster -s node1_cvm_ip,node2_cv...

Disk Space & Foundation

Cluster & Nodes

Disk Space (CVM) Find what's eating space on a CVM, sorted ascending du -sm ~/* | sort -n du -sm ~/data/* | sort -n du -sm ~/data/logs/* | sort -n     Foundation / Node Discovery See which unconfigured nodes Foundation/Avahi can discover on the network avahi-b...

VM Basics & Power Control

VM Management (AHV)

Overview List all VMs acli vm.list Show detailed info for a VM acli vm.get <vm_name>   Power Control Power on a VM acli vm.on <vm_name> Power off a VM (hard) acli vm.off <vm_name> Gracefully shut down a VM (via guest OS tools) acli vm.shutdown <vm_name> Live-m...

VM Create & Modify

VM Management (AHV)

Create & Modify Create a new VM acli vm.create <vm_name> memory=<GB> num_vcpus=<n> Clone a VM acli vm.clone <vm_name> new_names=<new_name> Add a disk to a VM acli vm.disk_create <vm_name> container=<container> create_size=<size> Add a NIC to a VM acli vm.nic_c...

Hosts & Bulk Actions

VM Management (AHV)

Hosts (acli view) List AHV hosts from acli's perspective acli host.list     Bulk-Aktionen Alle laufenden VMs auf dem Cluster gracefully herunterfahren (z. B. vor Wartung) for vm_name in `acli vm.list power_state=on | awk '{print $1}'`; do acli vm.shutdown $vm_...