Heads Up! Misbehaving APD functionality in vSphere 6.0

A very quick “public service announcement” post this morning folks, simply to bring your attention to a new knowledge base article that our support team have published. The issue relates to APD (All Paths Down) which is a condition that can occur when a storage device is removed from an ESXi host in an uncontrolled manner. The issue only affects ESXi 6.0. The bottom line is that even though the paths to the device recover and the device is online, the APD timeout continues to count down and expire, and as a result, the device is placed in APD timeout…

vSphere 6.0 HA and Component Protection with vMSC

I had a query recently about changes to vSphere 6.0, especially when it comes to vSphere HA and Component Protection (VMCP) with vMSC, vSphere Metro Storage Cluster. The question is very straight forward – do all the same advanced setting recommendations for PDL and APD apply to vMSC on vSphere 6.0 as they did for vSphere 5.5? Or do we have some new recommendations now around PDL and APD for vMSC with the introduction of VMCP in vSphere 6.0?

Heads Up! Patches now available for NFS APD Issue

Very quick update … Many readers will be aware of an ongoing issue with NFS in ESXi 5.5U1. My colleague, Duncan, wrote an article about it on his blog site recently entitled – Alert: vSphere 5.5 & NFS issue. Essentially, your NFS datastore may experience an APD (All Paths Down) condition. The issue is also described in KB article 2076392. I’m pleased to say that VMware has now produced a patch to address this issue. The patch is 5.5EP4 (June 2014) and can be downloaded from VMware’s patch repository site here and will address this issue. Search on ESXi (Embedded…

vSphere 5.5. Storage Enhancements Part 9 – PDL AutoRemove

We at VMware have been making considerable changes to the way that the All Paths Down (APD for short) and PDL (Permanent Device Loss) conditions are handled. In vSphere 5.1, we introduced a number of enhancements around APD, including timeouts for devices that entered into the APD state. I wrote about the vSphere 5.1 APD improvements here. In vSphere 5.5 we introduced yet another improvement to this mechanism, namely the automatic removal of devices which have entered the PDL state from the ESXi host.

vSphere 5.1 Storage Enhancements – Part 4: All Paths Down (APD)

All Paths Down (APD) is a situation which occurs when a storage device is removed from the ESXi host in an uncontrolled manner, either due to administrative error or device failure. Over the previous number of vSphere releases, VMware has made significant improvements to handling the APD, the All Paths Down, condition. This is a difficult condition to manage since we don’t know if the device is gone forever or if it might come back, i.e. is it a permanent device loss or is it a transient condition.