> On 3 Oct 2016, at 12:30 PM, O. Hartmann <ohart...@zedat.fu-berlin.de> wrote: > > Am Sun, 2 Oct 2016 15:30:41 -0400 > Allan Jude <allanj...@freebsd.org <mailto:allanj...@freebsd.org>> schrieb: > >> On 2016-10-02 15:25, O. Hartmann 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. >>> >>> The drive sounds like hell, the heads are moving rapidly. The copy speed is >>> incredibly >>> slow compared to another box I usually use in the lab with UFS filesystem >>> only >>> (different type of HDD). >>> >>> The whole stuff the nanbsd is installed from and to is on a separate ZFS >>> partition, >>> but in the same pool as everything else. When I first setup the new >>> partitions, I >>> switched on deduplication, but I quickly deactivated it, because it had a >>> tremendous >>> impact on the working speed and memory consumption on that box. But >>> something seems >>> not right since then - as I initially described, the copy/initialisation >>> speed/bandwith is abyssal. Well, I also fear that I did something wrong >>> when I firt >>> initialised the HDD - there is this 125bytes/4k block discussion and I do >>> not know >>> how to check whether I'm affected to that or not (or even causing the >>> problems) and >>> how to check whether DEDUPLICATION is definitely OFF (apart from the usual >>> stuff list >>> features via "zfs get all"). >>> >>> As an example: the nanbosd script takes ~ 1 minute to copy /boot/loader >>> from source to >>> memory disk and the HDD makes sounds like hell and close to loosing the r/w >>> heads. On >>> other boxes this task is done in a blink of an eye ... >>> >>> Thanks for your patience, >>> >>> Regards, >>> oh >>> >> >> Turning deduplication off, only stops new blocks from being >> deduplicated. Any data written while deduplication was on, are still >> deduplicated. You would need to zfs send | zfs recv, or >> backup/destroy/restore to get the data back to normal. >> >> If the drive is making that much noise, have you considered that the >> drive might be failing? >> > > Hello. > > Might there be any hint I can investigate on that ZFS partition showing me > that the > particular partition is still doing deduplication? If I wouldn't know that I > switch > dedup on and later off, I would blame the OS instead. So, for further > forensik analysis > in the future, it would be nice to know how to look at it - if it is doable > via simple > checking the features of the ZFS partition ... > > Thanks, > oh
not really an answer, but zpool has a nice command: history, it sometimes helps to find what and when nfs commands where given. danny _______________________________________________ email@example.com mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"