Tag Archives: VMware

Paris Tuileries Garden Facepalm statue

Further ESXi 6.0 CBT bug info – Reset your CBT!!!

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Following on from the recent (November 2015) ESXi 6.0 CBT bug, which has now been fixed in the latest released patch ESXi600-201511401-BG, some further information has come to light, provided by Anton Gostev, of Veeam.

You can read the snippet of important information from the Veeam forum post following the issue (Official Veeam KB2075);

All, we have completed the first day of testing in the same exact lab and using the same heavy write I/O test that made the original issue easily reproducible. After a few TB of increments, the above-mention patch appears to fully resolve the original issue when installed on ESX 6.0 Update 1a build 3073146.

However, we found that simply installing the patch is not sufficient, and CBT reset is required for all of your VMs. This is because existing CBT map files may contain issues created earlier due to the original bug, which may result in inconsistent full backups in future. Having CBT reset will also force the following job run use "full scan" incremental pass, thus fixing any existing inconsistencies in backups and replicas, as discussed earlier in this topic.

Provided CBT reset has been performed, Active Full backups is not required.

Performing Active Full backups by itself cannot be considered as a substitute to CBT reset with this particular CBT issue.

Thanks!

You can either follow the CBT Reset instructions from Veeam or look over to Chris Wahl’s latest blog post “Resetting VMware’s Changed Block Tracking (CBT) File with PowerCLI”.

Regards

Dean

Smashing Laptop With Hammer

ESXi 6.0 CBT Issue KB 2136854 – Resolved #vDM30in30

VMware, , , , , , , ,

I wrote about the latest CBT issue (November edition) a couple of days ago, and as promised by VMware a patch has been released.

Original issue – KB 2136854

Patch to resolve the issue – ESXi600-201511001 (2137545)

Note: Before applying this patch on HP Proliant Gen 9 servers, see VMware ESXi 6.0 host fails to detect local disk after patching or applying Update 1 on HP Proliant Gen 9 servers (2120539).

103112_Solve_5_Major_Issues

Cheers VMware, lets hope this is the last of the CBT issues!!!
Regards

Dean

my development toolkit

My daily tool kit – IT gadgets and software – #vDM30in30

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I have currently spent a lot of time visiting different customer sites and working with them to build up a picture of their environment and such. Usually with the aim to provide a design around architectural changes that we would recommend to move their environments forward.

So I thought I’d give a short list of some of my day-to-day tools, this isn’t a comprehensive list, and I spend most of my time working with VMware. So take this with a pinch of salt!

Tools/Gadgets

Wera 10000v Screwdriver set – Handy set of screwdrivers, I know most people opt for a multi-driver, but I’ve been on some sites where the cabling and power has been questionable. I wouldn’t say these are the toughest tip drivers around, but I’ve had them a few years and they have lasted.

WER006147 Continue reading My daily tool kit – IT gadgets and software – #vDM30in30 →

backup error

Yet again, ESXi 6.0, CBT issues #vDM30in30

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So here we are again, rounding the year off with yet another change block tracking warning.

I’ve written posts previously on the CBT bugs found in 5.5 and below and those found when vSphere 6.0 was released into the wild.

So whats the issue this time?

Basically it is the same as last time, the wrong sectors of data locations are returned by CBT when requested by your backup software. Meaning it targets the wrong data to backup.

Here is the official VMware KB 2136854. Which describes the following;

When running virtual machine backups which utilize Changed Block Tracking (CBT) in ESXi 6.0, you experience these symptoms:

 - The CBT API call QueryDiskChangedAreas() API call can sometimes      return incorrect changed sectors, which results in inconsistent  incremental virtual machine backups.

 - Inconsistent virtual machine backups

All incremental backups which utilize CBT are potentially affected.

Anton Gostev, Veeam, has released a lengthy email to Veeam customers and Gostev lovers stating the following (you can follow the veeam forum post here); Continue reading Yet again, ESXi 6.0, CBT issues #vDM30in30 →

podcast

Guest appearance on the AdminAdmin Podcast

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This is a little of a late post but back in June I was invited by the amigos over at AdminAdmin Podcast to chat about my favourite subject. Me!

This was prompted after they mentioned my How to document posts, and I reached out to say thanks as it had generated extra traffic for my blog.

You can click this sentence to listen to the episode.

So thank you for having me guys and keep up the great work.

You can add them on twitter as well.