PM 6.* ZFS pools with disk by id, why?

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mailinglists

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Mar 14, 2012
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Hi guys,

is there any reason (except for race cases when /dev/sd* device names change) why since PM 6 installer switched from /dev/sdX to /dev/disks/by-id/* names when creating rpool?

I guess some documentation like one here:
https://pve.proxmox.com/wiki/ZFS:_Tips_and_Tricks
should be updated to use disk IDs?

Also HTTPS GUI still creates zfs pools using /dev/sd*, so I manually created additional pools, to have consistent naming of devices in my ZFS pools on the same server.
 
mailinglists said:
is there any reason (except for race cases when /dev/sd* device names change) why since PM 6 installer switched from /dev/sdX to /dev/disks/by-id/* names when creating rpool?
Click to expand...

Yes. Think that for example one of your hdd is broken (let say sdb). Now you decide to stop your server, and to replace sdb with a new disk.
How do you find what phisical sdb is? With a pool with 2 disk is 50% chanse to be wrong. But with 8 hdd?

With by-id is very simple because this ID is the same ID that is print on the hdd label. So when I put any hdd in a server I make photos of the hdd label and the slot position in the server.

Good luck!
 
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I guess we should open a feature request to fix this documentation as well as to make https GUI ZFS pool creation also reference devices by-id.
Anyone from proxmox team wants to do it?
 
Wld like to follow up on this -- and I hope this makes sense ..

I have 2 i TB drives which I wld like to use as zfs mirror, and wld like to follow the advice of using disk-by-id and not the fleeting/changeable /dev/sdxx format.

The 2 disks appear in the /dev/disk/by-id directory, but they appear twice with different prefixes:

ata-st1000dm003 .....etc etc

wwn-0x500c500etc etc....


question is -- which of these id's shouls I use ?? is the second expression a mount point for the system ???

I am assuming the ata expression is what I want to use ...

Thank you for this ...
 
Hi,

Any form is ok (wwn or ata). Some dedicated storage have displays who can show wwn.. . For normal users ata is more useful I think because it have the SN of the hdd witch you can see it on the hdd label.

Good luck / Bafta
 
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