2016-02-05 23:30 GMT+01:00 Dave Chinner <david@xxxxxxxxxxxxx>:
On Fri, Feb 05, 2016 at 02:13:00PM +0100, Michel Verbraak wrote:
> All,
>
> Recently we ran into a problem where our filesystem (300GB in size)
> reported 'no space left on device' (ENOSPC) but when we looked at disk
> space usage and inode usage it was around 52% for disk space and 11% for
.......
>
> Store 03 (root@server):~# xfs_db -c freesp /dev/sdb
> from to extents blocks pct
> 1 1 3282633 3282633 9.03
> 2 3 3416223 8372325 23.03
> 4 7 6175009 24700036 67.94
Yup, no more aligned 4 block extents in the filesystem.
Dave Thank you for your answer but are you able to explain a bit more on how you determine there are no aligned 4 block extends available?
It apparently is not the 'from 4 to 7' line telling there are at least continuous extents of 4 blocks big. Or is it because 24700036 divided by 6175009 is exactly 4 and not a bit more?
When I calculate the ratio between the individual AG freesp they were all four exactly 4.
As said we would like to detect this problem from happening again. And we would like this detection to be done by our monitoring service.
One of my colleagues mentions the following calculation to find out if there are enough aligned 4 block extents:
Starting from line "from 4 to 7" calculate: <blocks-column> - (4 * <extents-column>) > 0. When not there is not enough free space for new inodes.
On another system we have which does not see these problems yet we have:
from to extents blocks pct
1 1 3483987 3483987 7.83
2 3 3560607 8709838 19.58
4 7 6402893 26486634 59.55
8 15 418450 5799206 13.04
from to extents blocks pct
1 1 3483987 3483987 7.83
2 3 3560607 8709838 19.58
4 7 6402893 26486634 59.55
8 15 418450 5799206 13.04
26486634 / 6402893 = 4.136666 and
26486634 - (4 * 6402893) = 875062 > 0 and
5799205 - (4 * 418450) = 4125405 > 0
5799205 - (4 * 418450) = 4125405 > 0
into this condition.
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
Michel.
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