tmpfs runs out of space on 8.2pre-release, zfs related?

miyamoto moesasji miyamoto.31b at
Sun Jan 2 08:41:06 UTC 2011

miyamoto moesasji <miyamoto.31b <at>> writes:

> In setting up tmpfs (so not tmpmfs) on a machine that is using
> zfs(v15, zfs v4) on 8.2prerelease I run out of space on the tmpfs when
> copying a file of ~4.6 GB file from the zfs-filesystem to the memory
> disk. This machine has 8GB of memory backed by swap on the harddisk,
> so I expected the file to copy to memory without problems.

....this is in fact worse than I first thought. After leaving the
machine running overnight the tmpfs is reduced to a size of 4K, which
shows that tmpfs is in fact
completely unusable for me. See the output of df:
hge at PulsarX4:~/ > df -hi /tmp
Filesystem    Size    Used   Avail Capacity iused ifree %iused  Mounted on
tmpfs         4.0K    4.0K      0B   100%      18     0  100%   /tmp

Relevant zfs-stats info:
System Memory Statistics:
	Physical Memory:			8161.74M
	Kernel Memory:				4117.40M
	DATA:				99.29%	4088.07M
	TEXT:				0.71%	29.33M

ARC Size:
	Current Size (arcsize):		63.58%	4370.60M
	Target Size (Adaptive, c):	100.00%	6874.44M
	Min Size (Hard Limit, c_min):	12.50%	859.31M
	Max Size (High Water, c_max):	~8:1	6874.44M

I'm not sure what triggered this further reduction in size; but the
above 4K size is probably important to show how dramatic this goes

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