SSD slow disk in VS affects customer production.
  

CTI TF Lv2Posted 22 Aug 2022 14:53

Bug Phenomena
SSD slow disk in VS affects customer production.

Trigger conditions
The 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 Cause
When 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 check
If 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.  


Solution
Upgrade to version 6.3.0R3 or 6.7.0R2.

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Newbie517762 Lv3Posted 22 Aug 2022 15:51
  
Thanks for the helpful advice !
Maxon Lv1Posted 25 Aug 2022 10:20
  
Thanks for the wonderful sharing!
Newbie308427 Lv4Posted 19 Oct 2022 23:49
  
nice sharing
Faisal P Lv8Posted 30 Oct 2022 22:38
  
Thank you very much for the information ...
Faisal P Lv8Posted 30 Oct 2022 22:39
  
Nice article ...
Faisal P Lv8Posted 30 Oct 2022 22:39
  
Great info ...
Faisal P Lv8Posted 30 Oct 2022 22:40
  
Very informative ...
Faisal P Lv8Posted 30 Oct 2022 22:40
  
Nice guidance ...
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