• Sun. Feb 28th, 2021

Andreas

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  • ZFS: Fun with ZFS – is compression and deduplication useful for my data and how much memory do I need for zfs dedup?

ZFS: Fun with ZFS – is compression and deduplication useful for my data and how much memory do I need for zfs dedup?

It is widely know that ZFS can compress and deduplicate. The deduplication works across the pool level and removes duplicate data blocks as they are written to disk. This results…

Xenserver: Changing poolmaster when old poolmaster is not available

Scenario, a 2 node XenServer Cluster with HA. In general, one node is assigned a pool master to which for example the XenCenter is going to connect to. Now exactly…

Xenserver: failed disk move / cannot delete vdi because of being assigned to control domain

Situation: A move of a VM failed and left me with the VDI (Virtual Disk) and the VM on the old “location” and a VDI on the designated new location (something…

Xenserver: Adding a server to a Pool

This is going to cover 2 error messages when adding a new / additional Server to a XenServer pool. 1) This server’s hardware is incompatible with the masters. 2) The CPU does…

Proxmox: Rename a standalone node (hostname)

Update 2021-01-09 DO NOT USE THIS PROCEDURE FOR NOW AS ITS OUTDATED AND BREAKING THE CONFIG Doing some cleanup and had to rename a nodename of an existing standalone Proxmox…

XenServer 6.x: Set a guest VM to Autostart on boot

A new virtualization product, new issues. I started to look into XenServer. http://xenserver.org/ Please note do not go for the new Creedence (6.4 Beta) because there is no upgrade path afterwards. It…

Proxmox : vzdump performance optimization

Just found this on the Proxmox Wiki https://pve.proxmox.com/wiki/Performance_Tweaks#VZdump stating that the default value for vzdump is limited to 10000 Kbps (10 Mbps). This might explain even my misunderstanding why backups to my…

Proxmox: Getting some performance data from a Proxmox server

For the Records, in order to get performance data from a proxmox server you can use: pveperf [email protected]:~# pveperf CPU BOGOMIPS: 21281.44 REGEX/SECOND: 1039338 HD SIZE: 28.05 GB (/dev/mapper/pve-root) BUFFERED…

Centos: How to make splunkstorm forwarder autostart at boot.

I love Splunk for log aggregation and searching through it. It’s a great tool that comes is various versions http://www.splunk.com/view/free-vs-enterprise/SP-CAAAE8W  including a limited free cloud based version https://www.splunkstorm.com. I use…

VPS : Basic checks for performance of a VPS and or a Server

There is more than one way to check the performance available on a VPS Server but I go for a 1st quick shot to test if something is falling over.…