Home / server / Questions / 763256
In Process
Locane
Asked: 2016-03-12 15:00:35 +0800 CST

ZFS on Centos - "No such pool or dataset" and "devices is currently unavailable"

  • 772

I'm trying to create zpools on CentOS 7 (3.10.0-327.10.1), and the zpool command seems to hate "wwn-0x" IDs.

"zpool status" is clear - there are no zpools currently configured on the machine. I have drives:

lrwxrwxrwx. 1 root root    9 Mar 11 14:30 wwn-0x5000cca2440ba0a0 -> ../../sds
lrwxrwxrwx. 1 root root    9 Mar 11 14:30 wwn-0x5000cca2440ba1dc -> ../../sdu
lrwxrwxrwx. 1 root root    9 Mar 11 14:30 wwn-0x5000cca2440992cc -> ../../sdl

If I type:

zpool create -f asdf /dev/sds /dev/sdu /dev/sdl

It works great.

If I use the WWN IDs, however, I get errors, depending on what I send it:

zpool create -f asdf wwn-0x5000cca2440ba0a0 wwn-0x5000cca2440ba1dc wwn-0x5000cca2440992cc

Yields:

cannot create 'asdf': no such pool or dataset

And typing (adding the keyword "mirror"):

zpool create -f asdf mirror wwn-0x5000cca2440ba0a0 wwn-0x5000cca2440ba1dc wwn-0x5000cca2440992cc

Yields:

cannot create 'asdf': one or more devices is currently unavailable

Specifying the full path, "/dev/disk/by-id/" + WWN, yields the same results.

This works great on Ubuntu. What's going on here? Does anyone know? Is it a bug in ZOL?

centos

1 Answers

  1. "one or more devices is currently unavailable"

    That's a misleading message.

    What does your fdisk -l show?

    You can use full paths if you want, but I suspect your syntax is wrong... Also, the easiest approach is to run the command from within the /dev/disk/by-id/ directory.

    Make sense?

    This is what I would build a ZFS mirrors/striped set with:

    zpool create vol0 -o ashift=13 -o autoexpand=on -o autoreplace=on -f mirror wwn-0x5001e8200262d41c wwn-0x5001e8200262cf48 mirror wwn-0x5001e8200262cbdc wwn-0x5001e82002758f94 mirror wwn-0x5001e8200262cf18 wwn-0x5001e82002759358 mirror wwn-0x5001e8200262d0c4 wwn-0x5001e820027591bc

    So your command line should look like:

    zpool create asdf -f mirror wwn-0x5000cca2440ba0a0 wwn-0x5000cca2440ba1dc mirror wwn-0x5000cca2440992cc

    • 1