Thank you Don - yes it looks like it is one particular VMFS reporting the warning. I'll try your recommendations asap.

Thanks again Don. I was able to clear using the command in CLI. I have verified backups and my drives are a mix with 10000 RPM being the minimum,

Same Error here.... the Support investigate the problem and told us that the volume and snapshots are effected and we have to delete both to get rid of the problem. So we have to restore a few TBs and than we delete the effected volumes.

Regards,
Joerg

Customer runs V7.1.2. . It was not my case/customer.

But we follow the advice from the eql support. The exact msg was "Warning health condition currently exist. -> Lost blocks detected in RAID set."

From the action plan:

"... Lost blocks generally occur on drives during a reconstruction or copy to spare when a block on a drive has been damaged, normally we would reconstruct that bad form the parity or the mirror but If that block that belongs to the partity has also been damaged then the block is marked as lost.

To clear the lost blocks you must firstly delete the following snapshots that contain some lost blocks which are the following:...."

Regards,
Joerg

Hi Don. 1 member with 15 disks and 6 volumes. Originally built with 10k  rpm drives but replaced with 15K drives as they failed down the years.  my understanding was the 15Ks would simply spin at 10K and be fine. Am I wrong? All 15 drives are Dell but newer ones are a different model version.

hi

what is the impact on the volume ? did you lost all the data ?

thanks