Recovering VMs after a vmware’s Purple Screen of Death (PSOD)

I had an interesting case a while ago. One of our test ESXI hosts running ESXi version 5.5 has crashed taking down number of test environments with it.

All the attempts to bring the host back to life was in vain, as each reboot was giving us a Purple screen of Death.  We needed these test environments up and running ASAP, and due to time limit on hands, it was decided to :

  1. keep the current VMFS datastore and install partition intact,
  2. Install ESXI 5.5 from scratch onto a USB flash drive, and
  3. Re-create the vSwitches
  4. Re-import the VMs into inventory
  5. Re-import and start up the vCenter
  6. Login to vCenter and bring up the test environment back online

Luckily this test server- a Cisco UCS C220- had its CIMC enabled, and IP configured for remote access.  So, I was able to connect to the hosts’s remote management panel (CIMC) and install the new Esxi via Continue reading →

Working with OpenDJ Server configs

This post provides examples of dsconfig usage for OpenDJ config management. I might expand and update the post in the future, as i find more info.

All the logs audit trails will be saved as long as you use OpenDJ supplied tools for modifying the DJ configs:
Tools are:

  • OpenDJ Control Panel and
  • openDJ command line tools, located under /bin directory, of the OpenDJ install

You could also modify the config files directly, via vi or nano, if you don’t care about proper audit trail or automatic config file backups, each time you modify something. Continue reading →

Lab1:Server for nested ESXi Host

Currently using a Dell C1100 (cs24-TY) with 2x quad core L5520 CPUs and 72 GB of RAM. Ebay has them plenty for anywhere from $500-$699 with out HDDs, trays included. Unfortunately this server does not come with a RAID controller, and is quite loud when running under a load.
This particular server does not come with hardware RAID, and VMware does not support software RAID. It means you will need/have to use individual drives and wont be able to take advantage of any kind RAID setups for a speed/IOps boost.
I bought it at the moment due to its cost, size (1U), performance/RAM (72GB), and requirements I had in place, originally.

I have populated it with  2 x SAMSUNG 840 240GB and 1 SAMSUNG 850 EVO 250GB SSD drives, and a 2 TB WD 7200 RPM drive, which is used primarily for backups and VMs that require low IOPS.

I am currently running several nested ESXi 5.1, and 5.5 on it, and its handling it all quite well.

Categories: lab