[NAS] WD Red Plus -> CMR


“Western Digital macht künftig besser erkenntlich, welche WD-Red-Festplatten auf klassisches Conventional Magnetic Recording (CMR) oder potenziell langsameres Shingled Magnetic Recording (SMR) setzen: Der Hersteller überführt alle CMR-Modelle der WD-Red-Serie in die neue Baureihe WD Red Plus. Wer künftig eine normale WD-Red-Festplatte ohne Namenszusatz kauft, bekommt folglich sicher eine SMR-Variante.”

CMR = Conventional Magnetic Recording
SMR = Shingled Magnetic Recording (ungeeignet für NAS)


CMR Produktbezeichnungen: WD10EFRX (1 TB), WD20EFRX (2 TB) , WD30EFRX (3 TB), WD40EFRX (4 TB), WD60EFRX (6 TB), WD80EFAX (8 TB), WD101EFAX (10 TB), WD120EFAX (12 TB), WD140EFAX (14 TB)

SMR Produktbezeichnungen: WD20EFAX (2 TB), WD30EFAX (3 TB), WD40EFAX (4 TB) und WD60EFAX (6 TB)

[ZFS] Replace failed disk on my Proxmox Host

Yesterday evening I got an email that on my Proxmox server a disk has failed. In my ZFS Raidz1 I have 4 different drives of two manufactures: 2x HGST and 2x Seagate.
In the last 7 years I also used some Western Digitals. The only faulty hard drives I had in this years were from Seagate. This was the third… So this morning I bought a new hard disk, this time a Western Digital Red, and replaced the failed disk.

SSH into my server and checked the zpool data. Because I already removed the failed disk, it’s marked as unavailable.

failed disk: wwn-0x5000c5009c14365b

Now I had to find the Id of my new disk. With fdisk -l, I found my new disk as /dev/sde, but there was no id listed.

sudo fdisk -l

To be sure I checked again with:

sudo lsblk -f

With disk by-id I now got the Id.

ls /dev/disk/by-id/ -l | grep sde

new disk: ata-WDC_WD40EFRX-68N32N0_WD-WCC7K1CSDLRT
and again the failed disk: wwn-0x5000c5009c14365b

Before replacing the disks, I did a short SMART test.

sudo smartctl -a /dev/sde
sudo smartctl -t short /dev/sde
sudo smartctl -a /dev/sde

The new disk had no errors. And because it is a new disk, I don’t had to wipe any file systems from it.

So first I took the failed disk offline. Not sure if that was necessary, because I already had removed the dirsk.

sudo zpool offline data 2664887927330352988

Next run the replace command.

sudo zpool replace data /dev/disk/by-id/wwn-0x5000c5009c14365b-part2

The resilver process for the 3TB disk took about 10 hours.