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(and me chasing them)

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Running Systems
(and me chasing them)

snapshots

bash | Disk Storage | Linux | Scripting/Programming

ZFS clone script

Byetzion 28/03/202119/01/2022

ZFS has some magical features, comparable to NetApp’s WAFL capabilities. One of the less-used on is the ZFS send/receive, which can be utilised as an engine below something much like NetApp’s SnapMirror or SnapVault. The idea, if you are not familiar with NetApp’s products, is to take a snapshot of a dataset on the source,…

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Disk Storage | Oracle

Attach multiple Oracle ASM snapshots to the same host

Byetzion 12/09/201319/10/2019

The goal – connecting multiple Oracle ASM snapshots (same source LUNs, of course) to the same machine. The next process will demonstrate how to do it. Problem: ASM disks use a disk label called ASMLib to maintain access even when the logical disk path might change (like adding a LUN with a lower ID and…

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Virtualization

Citrix XenServer 5.0 cannot cooperate with NetApp SnapMirror

Byetzion 08/09/2009

It has been a long while, I know. I was busy with life, work and everything around it. Not much worth mentioning. This, however, is something else. I have discovered an issue with Citrix XenServer 5.0 (probably the case with 5.5, but I have other issues with that release) using NetApp through NetApp API SR…

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Disk Storage | Linux | Scripting/Programming

MySQL permissions for LVM Snapshots

Byetzion 23/10/2008

aking LVM snapshots as a mean of backing up MySQL is rather simple, as can be described here. However, if you are into security, you would strive to grant minimal permissions for the action to the MySQL user. Per MySQL Documentation, the required privileges is “RELOAD”. That should be enough, granted on *.*, of course.

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Disk Storage | Linux | Scripting/Programming | Virtualization

Quick provisioning of virtual machines

Byetzion 01/02/2008

When one wants to achieve fast provisioning of virtual machines, some solutions might come into account. The one I prefer uses Linux LVM snapshot capabilities to duplicate one working machine into few.

This can happen, of course, only if the host running VMware-Server is Linux.

LVM snapshots have one vast disadvantage

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Disk Storage | Linux

Linux LVM performace measurement

Byetzion 10/06/2007

Modern Linux LVM offers great abilities to maintain snapshots of existing logical volumes. Unlike NetApp “Write Anywhere File Layout” (WAFL), Linux LVM uses “Copy-on-Write” (COW) to allow snapshots. The process, in general, can be described in this pdf document. I have issues several small tests, just to get real-life estimations of what is the actual…

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