Re: 800 GByte free, but "no space left"

["Helmut Hullen" <Hullen@t-online.de>]

Hallo, Evert,

Du meintest am 04.12.10 zum Thema Re: 800 GByte free, but "no space lef=
t":

> On Sat, Dec 4, 2010 at 10:17 AM, Helmut Hullen <Hullen@t-online.de>
> 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 =A0uuid: ad7c0668-316c-4a79-ba00-3b505b9d99b4
>>> =A0 =A0 =A0 Total devices 2 FS bytes used 2.38TB
>>> =A0 =A0 =A0 devid =A0 =A02 size 1.35TB used 1.35TB path /dev/sdc3
>>> =A0 =A0 =A0 devid =A0 =A01 size 1.81TB used 1.35TB path /dev/sdf2
>>
>>> ("btrfs-show" uses TiByte, it's 10% less than TByte)
>>
>>> Btrfs Btrfs v0.19
>>
>>> Filesystem =A0 =A0 =A0 =A0 =A0 1K-blocks =A0 =A0 =A0Used Available =
Use% Mounted on
>>> /dev/sdc3 =A0 =A0 =A0 =A0 =A0 =A03400799848 2559596740 841203108 =A0=
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 =20
(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 =20
TiByte, but my system tells "no space left" at about 2.4 TiByte - where=
 =20
are (at least) 300 GiByte hidden?

---------------------------------------

Kernel 2.6.35.8
btrfs-git from 20101117

Viele Gruesse!
Helmut
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