Hallo, Evert,
Du meintest am 04.12.10 zum Thema Re: 800 GByte free, but "no space left":
> On Sat, Dec 4, 2010 at 10:17 AM, Helmut Hullen <Hullen@xxxxxxxxxxx>
> wrote:
>> Hallo,
>>
>> I wrote am 02.12.10:
>>
>>> I use 2 disks (1.5 Tbyte and 2.0 TByte) under 1 LABEL (for my video
>>> collection, nearly alle files have more than 1 GByte):
>>
>>> Label: MM2 uuid: ad7c0668-316c-4a79-ba00-3b505b9d99b4
>>> Total devices 2 FS bytes used 2.38TB
>>> devid 2 size 1.35TB used 1.35TB path /dev/sdc3
>>> devid 1 size 1.81TB used 1.35TB path /dev/sdf2
>>
>>> ("btrfs-show" uses TiByte, it's 10% less than TByte)
>>
>>> Btrfs Btrfs v0.19
>>
>>> Filesystem 1K-blocks Used Available Use% Mounted on
>>> /dev/sdc3 3400799848 2559596740 841203108 76% /srv/MM
>>
>>> --------------------------------
>>
>>> When I add some more videos, writing gets slower and slower, and
>>> then the system refuses with "no space left ..."
>>
>> [...]
>> No help?
> I am not an expert on this by a long shot, but it looks like you
> added these two disks in raid0.
> This means that the total space cannot exceed the space of the
> smallest disk.
> ie: 1.35TB is the max you can use on any of your disks, as that is
> the size of the smallest disk. In other words, once any of the disks
> in a btrfs array runs out of space, the whole array is out of space.
> I don't know if this is intended, but it certainly would appear so.
I won't hope that this error is related to RAID0, I haven't installed
(as far as I know) RAID0.
My installation way:
(2-TByte-Disk)
mkfs.btrfs /dev/sdf2
mount /dev/sdf2 /srv/MM
(1.5-TByte-Disk)
btrfs device add /dev/sdc3 /srv/MM
btrfs filesystem balance /srv/MM
(and then waiting about 1 day ...)
Especially: no RAID definition.
If the smallest device defines the capacity then I should use 2*1.35
TiByte, but my system tells "no space left" at about 2.4 TiByte - where
are (at least) 300 GiByte hidden?
---------------------------------------
Kernel 2.6.35.8
btrfs-git from 20101117
Viele Gruesse!
Helmut
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