> If I understand you right it is as you said. > Here's an example and you can see what happened. > The sam-fs is filled to only 6% and the zvol ist full.
I'm afraid I was not clear with my question, so I'd elaborate, then. It remains standing as: during this situation, can you write new data into SAMFS? That is, can you fill it up from these 6% used? Or does the system complain that it can't write more data? The way I see this discussion (and maybe I'm wrong), it's thus: * Your zvol starts sparse (not using much space from the pool, but with a "quota" of 405Gb). That is, you don't have a "reservation" for these 405Gb to grab them as soon as you create the zvol and not let any other datasets use this space. * Your zvol allocates blocks from the pool to keep the data written by SAMFS, and the disk space consumed from the pool grows until the zvol hits the quota (405Gb of allocated blocks = 100% of quota). * SAMFS writes data to the zvol and never tells the zvol that you deleted some files so these blocks can be unallocated. * The zvol could release unused blocks - if it ever knew they are unused. If this is all true, then your zvol now consumes 405Gb from the pool, and your SAMFS thinks it uses 6% of the block device with its 25Gb of saved files. However, (and this is the salt of my question) the situation does not prevent you from writing the other 380Gb into the SAMFS without errors and complaints, and probably not changing the amount of space "used" in the ZFS pool and in the zvol dataset either. Is this assumption correct? If it is, then I'd see the situation as a big inconvenience and a way to improve interaction between SAMFS and ZFS as its storage (and/or fix a regression if this worked better in previous releases). But it's not a bug per se. However, if you can't write much data into the SAMFS now, it is definitely a bad bug. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
