Am Tue, 4 Oct 2016 12:42:32 +0200 Fabian Keil <freebsd-lis...@fabiankeil.de> schrieb:
> "O. Hartmann" <ohart...@zedat.fu-berlin.de> wrote: > > > Running 12-CURRENT (FreeBSD 12.0-CURRENT #32 r306579: Sun Oct 2 09:34:50 > > CEST 2016 > > ), I have a NanoBSD setup which creates an image for a router device. > > > > The problem I face is related to ZFS. The system has a system's SSD > > (Samsung 850 Pro, > > 256GB) which has an UFS filesystem. Aditionally, I have also a backup and a > > data HDD, > > both WD, one 3 TB WD RED Pro, on 4 TB WD RED (the backup device). Both the > > sources for > > the NanoBSD and the object tree as well as the NANO_WORLDDIR are residing > > on the 3 TB > > data drive. > > > > The box itself has 8 GB RAM. When it comes to create the memory disk, which > > is ~ 1,3 > > GB in size, the NanoBSD script starts creating the memory disk and then > > installing > > world into this memory disk. And this part is a kind of abyssal in terms of > > the > > speed. > > Can you reproduce the issue if you replace the memory disk with > a zvol or tmpfs? > > While I agree that depulication could be the cause of the problem, > it probably wouldn't hurt to rule out a memory-disk related issue > before recreating the pool. > > Fabian I guess this issue was triggered due to having deduplication enabled on the ZFS pool rather than on the ZFS partitions (this is a guess based upon comments made by knowing people and the fact, that the noisy copying and slowness went away after removing dedup from the ZFS pool).
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