Server consolidating disks

For each test, two parameters have been measured: a network ping executed each second, and the effective stun time read from VMware logs. Promoted features like VVOLs and Multi-Processor FT have made the news during the launch of v Sphere 6.0, and later the issues with CBT (change block tracking) have been the most talked topic, and all contributed to overlook this improvement.The first gives you the result has it can be seen from another application or user over the network connecting to the VM, while the second gives you the exact time spend by VMware engine to manage snapshot creation and consolidation. But with CBT issues now finally solved, if you were still looking for reasons to upgrade to v Sphere 6.0, this one alone in my opinion would be more then enough to justify an upgrade of all my ESXi servers to 6.0.Think about a really active VM like database machines for example, where setup with multiple disks are pretty common: the problem here can we way worse. You don’t build a marketing campaign over them, but still they are a huge part of what makes a solution a great solution.It’s not the hardware in use, there’s no backup software involved, it’s all about the snapshot technology. This enhancement in v Sphere snapshot consolidation is to be honest one of the biggest improvement I can remember in v Sphere releases.In order to verify the effects of snapshot creation and removal, different tests have been conducted.

The test involved two servers, one with ESXi 5.5 (5.5 Update 3) and one with ESXi 6.0 (6.0 Update 1b), while the rest of the environment is exactly the same: the same exact server model and characteristics, same network, and also the same NFS datastore to run the test virtual machine. Reply from 192.1: bytes=32 time=1ms TTL=62 Reply from 192.1: bytes=32 time=2ms TTL=62 Reply from 192.1: bytes=32 time=2ms TTL=62 Reply from 192.1: bytes=32 time=1ms TTL=62 Reply from 192.1: bytes=32 time=1ms TTL=62 Reply from 192.1: bytes=32 time=1ms TTL=62 Reply from 192.1: bytes=32 time=2ms TTL=62 Reply from 192.1: bytes=32 time=2ms TTL=62 Reply from 192.1: bytes=32 time=1ms TTL=62 2016-02-05T.276Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 5326 us 2016-02-05T.493Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 69898 us 2016-02-05T.714Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 63095 us 2016-02-05T.942Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 67560 us 2016-02-05T.166Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 65347 us 2016-02-05T.388Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 64597 us 2016-02-05T.610Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 63449 us 2016-02-05T.827Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 65439 us 2016-02-05T.054Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 69483 us 2016-02-05T.277Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 65957 us 2016-02-05T.501Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 64563 us 2016-02-05T.759Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 95898 us 2016-02-05T.983Z| vcpu-0| I120: Checkpoint_Unstun: vm stopped for 67014 us As we can notice immediately, the single stun time per disk has been dramatically reduced from around 1 second to 65 milliseconds; this is on average a 15x improvement!VMware strongly recommends downgrading VMware Tools to version 10.2.5 for VMs with the following configurations due to host panic or VM network losing configuration. Failed to connect to Site Recovery Manager Server at https://….. Http Host Connect Exception: You may already checked following SRM services Is it started? To verify v Center or PSC appliance time Login to appliance Verify the time...Workaround is mentioned in the KB below, check it out! One should now hopefully see snapshot consolidations completing in 1 pass (with minimal or indeed no helper disks) and with hopefully a dramatically shorter stun time, and a much small chance of consolidation failure.This sounded too good to be true, so my colleague Tom Sightler, Solutions Architect in Veeam, decided it was time to run some tests to prove this change.

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