Hi chjatwork,  Is this cluster still covered under an Isilon Support Contract? If so, the replacement should be done by a certified engineer as boot drives are not considered to be a customer replaceable unit. You can open a service request here for the replacement if one has not been automatically created:  [URL]  Otherwise there is documentation located here:  [URL]  Be sure to verify that the node is indeed a 108NL. A mistake made in replacing the boot drive could lead to data loss.
Community,  Any chance anyone would have the written procedures for how to replace the boot disk?  I believe the nodes are 108NL.  I know its a simple replacement but just want to make sure I have the written guidelines for reference and to back me up with my process.  I am getting these errors and know that I need to replace this boot disk.    24 Drive at Internal J3/ad4 wear_life threshold exceeded: 100   Thank you,
Internal Boot Drive replacement