Date: Thu, 16 Dec 2010 09:33:00 +0200 From: Andrei Kolu <antik@bsd.ee> To: Pawel Jakub Dawidek <pjd@freebsd.org>, freebsd-current@freebsd.org, freebsd-fs@freebsd.org Subject: Re: Next ZFSv28 patchset ready for testing. Message-ID: <AANLkTinP7HUgZ1hD2nURXu5sMBYxQqmrLuyY069=WvhO@mail.gmail.com> In-Reply-To: <AANLkTimds6gLxqSRhr7_WPzQXTjqqME63O0Aw5FK=G3p@mail.gmail.com> References: <20101213214556.GC2038@garage.freebsd.pl> <20101213231208.GK2038@garage.freebsd.pl> <AANLkTimds6gLxqSRhr7_WPzQXTjqqME63O0Aw5FK=G3p@mail.gmail.com>
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2010/12/15 Andrei Kolu <antik@bsd.ee>: > 2010/12/14 Pawel Jakub Dawidek <pjd@freebsd.org> >> >> On Mon, Dec 13, 2010 at 10:45:56PM +0100, Pawel Jakub Dawidek wrote: >> > Hi. >> > >> > The new patchset is ready for testing: >> > >> > =A0 =A0 =A0 http://people.freebsd.org/~pjd/patches/zfs_20101212.patch.= bz2 >> >> You can also download the whole source tree already patched from here: >> >> =A0 =A0 =A0 =A0http://people.freebsd.org/~pjd/zfs_20101212.tbz >> > > # uname -a > FreeBSD freebsd9.raidon.eu 9.0-CURRENT FreeBSD 9.0-CURRENT #0: Tue Dec > 14 14:37:01 EET 2010 > root@freebsd9.raidon.eu:/usr/obj/usr/src/sys/GENERIC =A0amd64 > > Create files filled with zeroes: > # mkfile 512m disk1 disk2 disk3 disk4 > #=A0zpool create andmed raidz /home/antik/disk{1,2,3,4} > # zpool status andmed > =A0pool: andmed > =A0state: ONLINE > =A0scan: none requested > config: > > =A0 =A0 =A0 =A0NAME =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 STATE =A0 =A0 REA= D WRITE CKSUM > =A0 =A0 =A0 =A0andmed =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ONLINE =A0 =A0 =A0 = 0 =A0 =A0 0 =A0 =A0 0 > =A0 =A0 =A0 =A0 =A0raidz1-0 =A0 =A0 =A0 =A0 =A0 =A0 ONLINE =A0 =A0 =A0 0 = =A0 =A0 0 =A0 =A0 0 > =A0 =A0 =A0 =A0 =A0 =A0/home/antik/disk1 =A0ONLINE =A0 =A0 =A0 0 =A0 =A0 = 0 =A0 =A0 0 > =A0 =A0 =A0 =A0 =A0 =A0/home/antik/disk2 =A0ONLINE =A0 =A0 =A0 0 =A0 =A0 = 0 =A0 =A0 0 > =A0 =A0 =A0 =A0 =A0 =A0/home/antik/disk3 =A0ONLINE =A0 =A0 =A0 0 =A0 =A0 = 0 =A0 =A0 0 > =A0 =A0 =A0 =A0 =A0 =A0/home/antik/disk4 =A0ONLINE =A0 =A0 =A0 0 =A0 =A0 = 0 =A0 =A0 0 > > errors: No known data errors > > Now let's try to scrub: > # zpool scrub andmed > > Fatal trap 12: page fault while in kernel mode > cpuid =3D 1; apic id =3D 01 > fault virtual address =3D 0x1fb8007b > fault code =3D supervisor read data, page not present > instruction pointer =3D 0x20:0xffffffff812967d2 > stack pointer =3D 0x20:0xffffff80ee605548 > frame pointer =3D 0x28:0xffffff80ee605730 > code segment =3D base 0x0, limit 0xfffff, type 0x1b > =A0=3D DPL 0, pres1, long 1, def32 0, gran 1 > processor eflags =3D interrupt enabled, resume, IOPL =3D 0 > current process =3D 2081 (initial thread) > [ thread pid 2081 tid 100121 ] > Stopped at =A0vdev_file_open+0x92: =A0testb =A0$0x20,0x7b(%rax) > > > Similar problem on FreeBSD 8.1: > http://www.freebsd.org/cgi/query-pr.cgi?pr=3D153126 > Workaround in FreeBSD would be mounting file based devices as block devices= : # mdconfig -f disk1 md0 # mdconfig -f disk2 md1 # mdconfig -f disk3 md2 # mdconfig -f disk4 md3 # zpool create andmed raidz md{0,1,2,3} # zpool scrub andmed # zpool status pool: andmed state: ONLINE scan: scrub repaired 0 in 0h0m with 0 errors on Wed Dec 15 15:57:34 2010 config: NAME STATE READ WRITE CKSUM andmed ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 md0 ONLINE 0 0 0 md1 ONLINE 0 0 0 md2 ONLINE 0 0 0 md3 ONLINE 0 0 0 errors: No known data errors ---------------------------------------------------------------------------= ------------- Deduplication is nice:) # zfs dedup=3Don peegel # zpool set dedupditto=3D100 peegel # zpool get all peegel | grep dedup peegel dedupditto 100 local peegel dedupratio 1.45x - # zdb -DD peegel DDT-sha256-zap-duplicate: 535 entries, size 284 on disk, 153 in core DDT-sha256-zap-unique: 446 entries, size 316 on disk, 183 in core DDT histogram (aggregated over all DDTs): bucket allocated referenced ______ ______________________________ ______________________________ refcnt blocks LSIZE PSIZE DSIZE blocks LSIZE PSIZE DSIZE ------ ------ ----- ----- ----- ------ ----- ----- ----- 1 446 7.27M 3.92M 3.92M 446 7.27M 3.92M 3.92M 2 534 5.91M 3.25M 3.25M 1.04K 11.8M 6.50M 6.50M 4 1 512 512 512 4 2K 2K 2K Total 981 13.2M 7.17M 7.17M 1.48K 19.1M 10.4M 10.4M dedup =3D 1.45, compress =3D 1.83, copies =3D 1.00, dedup * compress / copi= es =3D 2.66 ---------------------------------------------------------------------------= ------------- Now, I am trying to add cache devices to pool: # zpool add andmed cache da0 da1 looks like this command just hangs- system is responsible but pool is not accessible. How long it would take to cache data? I see no I/O operations going on. No error messages either. ---------------------------------------------------------------------------= ------------- PS: All this file based disk stuff I am trying to do is purely for entertainment purposes and of course for demonstration of technology. Andrei
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