In this example I'm using a Samsung SSD 850 EVO M.2 250GB which is currently in use as a local Datastore. The download link is at the bottom of this post.įirst of all, let's get started what you can see on an ESXi Host regarding to endurance without smartctl. For that reason I've ported a version of smartctl, which is part of smartmontools to ESXi. Unfortunatelly, VMware makes it hard to readout RAW S.M.A.R.T values on ESXi hosts. The current value can be readout with S.M.A.R.T. This value describes how many Terabytes can be written to the entire device, until the warranty expires. The value to keep an eye on is the guaranteed TBW (Total Bytes Written or Terabytes Written) which is typically provided by the vendor in their specifications. Depending on their technology, each cell can be overwritten from 1.000 times in consumer TLC SSDs up to 100.000 times in enterprise SLC based SSDs. They are used for caching (vFlash Read Cache, PernixData FVP), Virtual SAN or plain Datastores. A problem that comes with SSDs is their limited lifetime per cell. Solid-State-Drives are getting more and more common in ESXi Hosts.
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