Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

VMWare ESXi 4.1 Scratch partition?

Posted on 2013-05-27
3
Medium Priority
?
953 Views
Last Modified: 2013-05-27
Hi,

I have a lab-environment with ESXi 5.1-servers, they are installed on USB-drives.

There is a production environment I work with, which has ESX 4.1 servers, these are installed to SSD-drives. However, for config, choice has been made to move ONLY the scratch-partition to a SAN-drive.
Reason = SSD’s would be worn-out due to frequent read-writes.

Questions:

*is the reason above  a valid reason/reason to move the scratch-partition, also for (my) ESXi 5?
I always understood, you could remove the USB-drive once server has been booted, since everything runs in RAM (never tried it though)?

*if moving scratch-partion is advisable, is there an article + is there performance gain?

Please advise.
J.
0
Comment
Question by:janhoedt
  • 2
3 Comments
 

Author Comment

by:janhoedt
ID: 39199128
Thanks! Somehow contradictory however:


When booting from USB/SD keep in mind that once ESXi is loaded, it runs from memory and there is very little ongoing I/O to the boot device.


Because USB/SD devices are sensitive to high amounts of I/O the installer will not place the scratch partition on a USB/SD device.  Instead, the installer first scans for a local 4GB vfat partition, if it doesn’t find one it will then scan for a local VMFS volume on which to create a scratch directory.  If no local vfat partition or VMFS volume is found, as a last resort the installer will put the scratch partition in “/tmp/scratch” (i.e. put scratch on the local ramdisk).  If this happens it’s a good idea to manually reconfigure the scratch partition after the install.


So, first it says: it runs in memory BUT you should reconfigure the scratch partition to another drive if no local drive is available since it highly used ....
0
 
LVL 10

Accepted Solution

by:
Subhashish Laha earned 2000 total points
ID: 39199230
Hope this clears your doubt

This “scratch partition” is used for storing

- vm-support dumps
- log files
- userworld swapfiles (if enabled).

When using Boot-from-SAN or USB scratch partitions are not automatically created and the above mentioned files will be stored in a RAM disk. This means that after a reboot these files will be gone. Therefore, from an operational point of view it is a good idea to manually specify or script the scratch partition after the installation. You could use a VMFS volume for it and create multiple folders per server to store the respective files.

http://ituda.com/vmware-esx-scratch-partition-and-logging/
0

Featured Post

Free Backup Tool for VMware and Hyper-V

Restore full virtual machine or individual guest files from 19 common file systems directly from the backup file. Schedule VM backups with PowerShell scripts. Set desired time, lean back and let the script to notify you via email upon completion.  

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

HOW TO: Install and Configure VMware vSphere Hypervisor 6.5 (ESXi 6.5), Step by Step Tutorial with screenshots. From Download, Checking Media, to Completed Installation.
In this article will go through how to backup a vPostgres DB from a broken vCenter Appliance and restore to a new vCenter Appliance.
Advanced tutorial on how to run the esxtop command to capture a batch file in csv format in order to export the file and use it for performance analysis. He demonstrates how to download the file using a vSphere web client (or vSphere client) and exp…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…
Suggested Courses

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question