Replace failed Ceph disk on Dell hardware

We are using Dell 720 and 730xd servers for our Ceph OSD servers. Here is the process that we use in order to replace a disk and/or remove the faulty OSD from service.

In this example we will attempt to replace OSD #45 (slot #9 of this particular server):

Stop the OSD and unmount the directory:
stop ceph-osd id=45
umount /var/lib/ceph/osd/ceph-45
megacli -PDList -a0

If not already offline…offline the drive:
megacli -pdoffline -physdrv[32:9] -a0
Mark disk as missing:
megacli -pdmarkmissing -physdrv[32:9] -a0
Permanently remove drive from array:
megacli -pdprprmv -physdrv[32:9] -a0

NOW PHYSICALLY REPLACE THE BAD THE DRIVE WITH A NEW ONE.

Set drive state to online:
megacli -PDOnline -PhysDrv [32:9] -a0
Create Raid-0 array on new drive:
megacli -CfgLdAdd -r0[32:9] -a0

You may need to discard the cache before doing the last step:
First get cache lsit:
megacli -GetPreservedCacheList -a0
Clear whichover one you need to:
megacli -DiscardPreservedCache -L2 -a0

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