about – free_capacity_bytes

[fanbreeze]

If the space of one osd is lower than free_capacity_bytes, can I
think that a new file or a new replica will not be written in this
osd, but I can still read these data which are stored in this osd .

[Jan Stender]

Hi,

> If the space of one osd is lower than free_capacity_bytes, can I
> think that a new file or a new replica will not be written in this
> osd, but I can still read these data which are stored in this osd .

The policy attribute only affects files and replicas that will be
created in the future. Any existing file can be read, and any
non-replicated file can be written, regardless of the attribute.

Best regards,
Jan

[fanbreeze]

if one of osds' space is full, what will happen to xtreemfs

[Jan Stender]

> if one of osds' space is full, what will happen to xtreemfs

Append-writes to a file are only possible as long as sufficient disk
space is available. If one OSD runs out of free space, you will probably
get an I/O error. One of the reasons for the 'free_capacity_bytes'
attribute is to mitigate this problem, as the attribute ensures that at
least newly created files won't consume any of the remaining disk space.

Best regards,
Jan