Date: Wed, 3 Sep 2014 14:57:13 +0100 From: Tom Evans <tevans.uk@googlemail.com> To: Ronald Klop <ronald-lists@klop.ws> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: external zfs disk keeps writing Message-ID: <CAFHbX1JHE9FUsWV%2B2rQNyRJCJGLW5uJ7Gh4=PJd%2Bvr28s--q4g@mail.gmail.com> In-Reply-To: <op.xll4o1zakndu52@82-171-231-144.ip.telfort.nl> References: <op.xll4o1zakndu52@82-171-231-144.ip.telfort.nl>
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On Wed, Sep 3, 2014 at 2:20 PM, Ronald Klop <ronald-lists@klop.ws> wrote: > Hello, > > I have a disk with ZFS which always writes something every > 'vfs.zfs.txg.timeout' seconds. By default that is 5 seconds. If I make it 30 > I see writing in gstat every 30 seconds. > I only do a backup by zfs send | zfs recv hourly on this disk. So I don't > understand why it still writes something every 5 seconds while I am not > doing anything to this disk. > > How can I debug what is being written every 5 seconds? > > > Some info: > > I am running FreeBSD 10-STABLE. The disk is an external disk connected by > USB. > > ugen3.2: <Philips> at usbus3 > umass0: <Philips SPE3030CC, class 0/0, rev 2.00/0.00, addr 2> on usbus3 > umass0: SCSI over Bulk-Only; quirks = 0x4100 > umass0:4:0:-1: Attached to scbus4 > da0 at umass-sim0 bus 0 scbus4 target 0 lun 0 > da0: <Hitachi HDT725032VLAT80 V54O> Fixed Direct Access SCSI-0 device > da0: 40.000MB/s transfers > da0: 305245MB (625142448 512 byte sectors: 255H 63S/T 38913C) > da0: quirks=0x2<NO_6_BYTE> > > Occasionally I have a message like this, but it does not seem to hurt > anything, so it is probably unrelated. > > # bzgrep da0 /var/log/messages* > /var/log/messages.0.bz2:Sep 2 16:49:45 sjakie kernel: > (da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 00 00 03 66 00 00 02 00 > /var/log/messages.0.bz2:Sep 2 16:49:45 sjakie kernel: > (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error > /var/log/messages.0.bz2:Sep 2 16:49:45 sjakie kernel: > (da0:umass-sim0:0:0:0): Retrying command > > # zpool status extern > pool: extern > state: ONLINE > scan: scrub repaired 454K in 4h36m with 0 errors on Sat Aug 9 08:53:27 > 2014 > config: > > NAME STATE READ WRITE CKSUM > extern ONLINE 0 0 0 > da0 ONLINE 0 0 0 > > errors: No known data errors > > I just created a zpool on da0 so there is no partition table. > zfs set atime=off extern? Cheers Tom
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