Date: Wed, 03 Sep 2014 16:12:21 +0200 From: "Ronald Klop" <ronald-lists@klop.ws> To: "Tom Evans" <tevans.uk@googlemail.com> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: external zfs disk keeps writing Message-ID: <op.xll62vi8kndu52@82-171-231-144.ip.telfort.nl> In-Reply-To: <CAFHbX1JHE9FUsWV%2B2rQNyRJCJGLW5uJ7Gh4=PJd%2Bvr28s--q4g@mail.gmail.com> References: <op.xll4o1zakndu52@82-171-231-144.ip.telfort.nl> <CAFHbX1JHE9FUsWV%2B2rQNyRJCJGLW5uJ7Gh4=PJd%2Bvr28s--q4g@mail.gmail.com>
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On Wed, 03 Sep 2014 15:57:13 +0200, Tom Evans <tevans.uk@googlemail.com> wrote: > 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 Yes, atime is off. Ronald.
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