Re: Help me understand what is going on with my RAID1 FS

Thanks everyone for the helpful and detailed responses. Now that you confirmed that everything is fine with my FS, I'm all relaxed because I can for sure live with the output of df. On Mon, Sep 11, 2017 at 5:29 AM, Andrei Borzenkov wrote: > 10.09.2017 23:17, Dmitrii

Re: Help me understand what is going on with my RAID1 FS

10.09.2017 23:17, Dmitrii Tcvetkov пишет: >>> Drive1 Drive2Drive3 >>> X X >>> X X >>> X X >>> >>> Where X is a chunk of raid1 block group. >> >> But this table clearly shows that adding third drive increases free >> space by 50%.

Re: Help me understand what is going on with my RAID1 FS

FLJ posted on Sun, 10 Sep 2017 15:45:42 +0200 as excerpted: > I have a BTRFS RAID1 volume running for the past year. I avoided all > pitfalls known to me that would mess up this volume. I never > experimented with quotas, no-COW, snapshots, defrag, nothing really. > The volume is a RAID1 from day

Re: Help me understand what is going on with my RAID1 FS

Am Sun, 10 Sep 2017 20:15:52 +0200 schrieb Ferenc-Levente Juhos : > >Problem is that each raid1 block group contains two chunks on two > >separate devices, it can't utilize fully three devices no matter > >what. If that doesn't suit you then you need to add 4th disk. After >

Re: Help me understand what is going on with my RAID1 FS

> > Drive1 Drive2Drive3 > > X X > > X X > > X X > > > > Where X is a chunk of raid1 block group. > > But this table clearly shows that adding third drive increases free > space by 50%. You need to reallocate data to actually

Re: Help me understand what is going on with my RAID1 FS

10.09.2017 19:11, Dmitrii Tcvetkov пишет: >> Actually based on http://carfax.org.uk/btrfs-usage/index.html I >> would've expected 6 TB of usable space. Here I get 6.4 which is odd, >> but that only 1.5 TB is available is even stranger. >> >> Could anyone explain what I did wrong or why my

Re: Help me understand what is going on with my RAID1 FS

10.09.2017 18:47, Kai Krakow пишет: > Am Sun, 10 Sep 2017 15:45:42 +0200 > schrieb FLJ : > >> Hello all, >> >> I have a BTRFS RAID1 volume running for the past year. I avoided all >> pitfalls known to me that would mess up this volume. I never >> experimented with quotas,

Re: Help me understand what is going on with my RAID1 FS

>Problem is that each raid1 block group contains two chunks on two >separate devices, it can't utilize fully three devices no matter what. >If that doesn't suit you then you need to add 4th disk. After >that FS will be able to use all unallocated space on all disks in raid1 >profile. But even then

Re: Help me understand what is going on with my RAID1 FS

> @Kai and Dmitrii > thank you for your explanations if I understand you correctly, you're > saying that btrfs makes no attempt to "optimally" use the physical > devices it has in the FS, once a new RAID1 block group needs to be > allocated it will semi-randomly pick two devices with enough space

Re: Help me understand what is going on with my RAID1 FS

@Kai and Dmitrii thank you for your explanations if I understand you correctly, you're saying that btrfs makes no attempt to "optimally" use the physical devices it has in the FS, once a new RAID1 block group needs to be allocated it will semi-randomly pick two devices with enough space and

Re: Help me understand what is going on with my RAID1 FS

>Actually based on http://carfax.org.uk/btrfs-usage/index.html I >would've expected 6 TB of usable space. Here I get 6.4 which is odd, >but that only 1.5 TB is available is even stranger. > >Could anyone explain what I did wrong or why my expectations are wrong? > >Thank you in advance I'd say df

Re: Help me understand what is going on with my RAID1 FS

Am Sun, 10 Sep 2017 15:45:42 +0200 schrieb FLJ : > Hello all, > > I have a BTRFS RAID1 volume running for the past year. I avoided all > pitfalls known to me that would mess up this volume. I never > experimented with quotas, no-COW, snapshots, defrag, nothing really. > The