How do I fix degraded Zpool?

At a high level, replacing a specific faulted drive takes the following steps:

Identify the FAULTED or UNAVAILABLE drive.
zpool replace the drive in question.
Wait for the resilver to finish.
zpool remove the replaced drive.
zpool offline the removed drive.
Perform any necessary cleanup.

How do I replace the drive in Zpool?

The following are the basic steps for replacing a disk:

Offline the disk, if necessary, with the zpool offline command.
Remove the disk to be replaced.
Insert the replacement disk.
Run the zpool replace command. For example: # zpool replace tank c1t1d0.
Bring the disk online with the zpool online command.

Is ZFS dead?

PC file system progress stalled this week with the news on MacOSforge that Apple’s ZFS project is dead. ZFS Project Shutdown 2009-10-23 The ZFS project has been discontinued. The mailing list and repository will also be removed shortly. ZFS, developed by Sun engineers, is the first 21st century file system.

What does Zpool scrub do?

ZFS will automatically protect your data from “Bit rot”, something that can happen to ALL forms of storage. Every time ZFS reads a block, it compares it to it’s checksum, and automatically fixes it. Disk scrub will read all the VDEVs in the pool, therefor fixing any and all bit rot errors.

How do you take a device offline in zpool?

You can take a device offline by using the zpool offline command followed by the pool name and the device name. In the code example in the slide, the c1t0d0 device is taken offline.

Can a drive be replaced in a ZFS pool?

A drive fails or needs to be replaced in your ZFS Pool – your ZFS Pool is saying status: DEGRADED in the webui, or you’re getting emails telling you that the zpool is degraded: state: DEGRADEDstatus: One or more devices could not be opened. Sufficient replicas exist for the pool to continue functioning in a degraded state.

What happens when a device is taken offline by ZFS?

ZFS allows individual devices to be taken offline or brought online. When hardware is unreliable or not functioning properly, ZFS continues to read data from or write data to the device, assuming the condition is only temporary. If the condition is not temporary, you can instruct ZFS to ignore the device by taking it offline.

What happens when a device is taken offline in a storage pool?

After a device is taken offline, it can be brought online again by using the zpool online command. For example: When a device is brought online, any data that has been written to the pool is resynchronized with the newly available device. Note that you cannot use bring a device online to replace a disk.