Mazaffar,

In addition to those commands I also look at the output of these commands:

Notice how bay 9 has disk that is in "Replace" state. That disk was pro-actively smartfailed by the cluster and now is ready to be physically replaced with a new drive. Unfortunately we have had a couple of instances where the cluster did not dial-home so DellEMC support did not dispatch anyone to replace the drive.  So that's why we have scripts in place that monitor for these type of failures.

mycluster-1# isi_for_array -s isi devices list
mycluster-3:  Lnn  Location  Device    Lnum  State   Serial              
mycluster-3:  -----------------------------------------------------------
mycluster-3:  3    Bay  1    /dev/da1  27    L3      0RY8MNRA            
mycluster-3:  3    Bay  2    /dev/da2  26    HEALTHY Z1ZBVKR10000C728DLA4
mycluster-3:  3    Bay  3    /dev/da19 13    HEALTHY Z1ZBWGF20000C728JA4A
mycluster-3:  3    Bay  4    /dev/da20 38    HEALTHY Z1Z423X00000C441BFK7
mycluster-3:  3    Bay  5    /dev/da3  25    HEALTHY Z1ZBVP0D0000C728DL2M
mycluster-3:  3    Bay  6    /dev/da21 11    HEALTHY Z1ZBWDGV0000C72726N3
mycluster-3:  3    Bay  7    /dev/da22 10    HEALTHY Z1ZBVKLF0000C728DJNZ
mycluster-3:  3    Bay  8    /dev/da23 9     HEALTHY Z1Z5XMNY0000W5119JXB
mycluster-3:  3    Bay  9    /dev/da4  24    REPLACE Z1ZBW42L0000C728AWYZ
mycluster-3:  3    Bay 10    /dev/da24 36    HEALTHY Z1ZBVP1J0000C728DKSJ
mycluster-3:  3    Bay 11    /dev/da25 7     HEALTHY Z1ZBW3ZN0000C727E87X
mycluster-3:  3    Bay 12    /dev/da26 6     HEALTHY Z1Z7VATR0000R528SV1N
mycluster-3:  3    Bay 13    /dev/da5  23    HEALTHY Z1ZBW39G0000C728AWA9

On Generation 5 nodes we also used to monitor internal drives for wear. Here is a great article that explains that topic

https://community.emc.com/community/products/isilon/blog/2016/10/13/how-to-ssd-wear-level-on-isilon-onefs

Hopefully it helps

Thank you

why is there this

https://community.emc.com/docs/DOC-71575

as it seems there is a healthcheck process defined ? Is this in addition to this, in which case should not emc be aware their healthcheck process has gaps ?

http://raghuramnaidu.blogspot.com/2018/07/isilon-useful-commands.html