SSD slow disk in VS affects customer production.
Bug PhenomenaSSD slow disk in VS affects customer production.Trigger conditionsThe hardware failure of the SSD hard disk causes IO to not return or the IO delay is very large. From experience, new hard disks within 3 months and hard disks that have been used for more than 2 years have a higher probability of occurrence.
Root CauseWhen the SSD cache disk becomes a slow disk, the disk is still online, and there will still read and write operation to this slow disk. However, as the SSD is a slow disk, it will either not replying to the IO request or having long IO latency towards the request and resulting in VM IO stuck or having large IO latency.
How to checkIf a disk has no IO (r/s and w/s are both <=1), but the utilization (%utils) is 100%, it indicates that the disk is a slow disk, and the IO is stuck and will not reply to IO request.As old version of HCI do not support the slow cache disk isolation function, when the SSD disk becomes a slow disk, the disk cannot be isolated.
SolutionUpgrade to version 6.3.0R3 or 6.7.0R2. Thanks for the helpful advice ! Thanks for the wonderful sharing!:handshake nice sharing Thank you very much for the information ... :handshake Nice article ... :handshake Great info ... :handshake Very informative ... :handshake Nice guidance ... :handshake Experience high-definition streaming of your preferred movies and TV shows wherever you are, completely free!
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