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ESXi performance has deteriorate on SSD


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I'm seeing the following in the Events for a couple of my SSD's:

 

 Device t10.ATA_____INTEL_SSDXXXXXXX__
_____________________ 
performance has deteriorated. I/O latency 
increased from average value of 5514 
microseconds to 119963 microseconds.
warning

 

Device t10.ATA_____Samsung_SSD_840_Series_
_________________S19XXXXXX_____ 
performance has deteriorated. I/O latency 
increased from average value of 16504 
microseconds to 443068 microseconds.
warning

 

The Samsung is an RDM disk that I'm passing into a VM and the Intel a local datastore. I did a quick dd on the Samsung from within the VM and speeds are slow ~60-80MB/s.

 

Could this be something to do with garbage collection? I'm not whether TRIM it's supported in ESXi or not. I believe the Samsung has native TRIM support but not the Intel.

 

Should I be concerned?

 

 

 

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