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The_Great_Sephiroth
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Joined: 03 Oct 2014
Posts: 1602
Location: Fayetteville, NC, USA
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 Posted: Thu Apr 30, 2015 4:38 pm Post subject: BTRFS mounting? |
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Alright, I have two identical 500GB disks (SATA) on an old system and I intend to use them as /home via BTRFS. I created identical partitions on each (GPT) and created the file-system as "mkfs.btrfs -m raid1 -d raid1 -n 8192 -L Home -O ^extref /dev/sdb1 /dev/sdc1". All went well. However, I do not have a /dev/mdX device for it. When I use "btrfs filesystem show" I see it with a UUID and then it tells me it uses /dev/sdb1 and /dev/sdc1. So do I use that UUID to mount or what? I am not sure how to do this. I kind of expected something like /dev/md1.
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depontius
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Joined: 05 May 2004
Posts: 3509
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| Posted: Thu Apr 30, 2015 9:23 pm Post subject: |
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| Code: | | UUID="(blah-blah-blah)" /mnt/btrfs-1/real_root btrfs noauto,device=/dev/disk/by-partuuid/(blah-blah-blah) 1 2 |
The same issue worried me, which is why I added the partuuid section. I don't know how necessary it really was, but since I put both disks on GPT, it was available. Also, this system system has sda - sdg, including a removable drive, so I didn't want to use /dev/sd(number).
It works for me.
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davidm
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Joined: 26 Apr 2009
Posts: 557
Location: US
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| Posted: Fri May 01, 2015 1:02 am Post subject: |
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I use multi-device raid and use:
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/dev/sda / btrfs device=/dev/sda,device=/dev/sdb,device=/dev/sdc,device=/dev/sdd,rw,autodefrag,compress=lzo,noatime,thread_pool=16,subvol=gentoo 0 0
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You can probably mount it just by referring to one of the devices/partitions (such as /dev/sdb1) just as long as you have a proper intramfs. From what I understand btrfs will understand (as long as it was created properly) that it is multi-device and mount the other portion of the filesystem as well. It's pretty smart in that way. You probably don't need the device= portion but I have that in there from when I was experimenting with trying to do things without initramfs. |
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depontius
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Joined: 05 May 2004
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| Posted: Fri May 01, 2015 1:11 am Post subject: |
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BTW, I didn't put my root on btrfs - this is on my server, and btrfs is served over NFS V4 for /home on my network.
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