Date: Sun, 2 Oct 2016 15:30:41 -0400 From: Allan Jude <allanjude@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: ZFS - Abyssal slow on copying Message-ID: <ae0af48b-b462-876e-4139-a6fcc2836794@freebsd.org> In-Reply-To: <20161002212504.2d782002.ohartman@zedat.fu-berlin.de> References: <20161002212504.2d782002.ohartman@zedat.fu-berlin.de>
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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? -- Allan Jude
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