Mdadm has one nice feature which enables us to replace drives with larger capacity ones. We can replace 500GB drives with 2TB drives with no downtime, it only takes time. At the start we have following setup: We proceed and replace one drive with a larger one. New empty drive …
There are 2 disks containing / and SWAP partition. # lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 136.8G 0 disk ├─sda1 8:1 0 130.4G 0 part │ └─md0 9:0 0 130.3G 0 raid1 / └─sda2 8:2 0 6.4G 0 part └─md1 9:1 0 6.4G 0 raid1 [SWAP] …
Depending on an use case sometimes you have to change hotspare disk behavior. In this case smartctl was monitoring all the disks behind hardware RAID, and one disk failed to read SMART Attribute Data. # megaclisas-status– Controller information — — ID | H/W Model | RAM | Temp | BBU …