Date: Wed, 03 Sep 2014 15:20:51 +0200 From: "Ronald Klop" <ronald-lists@klop.ws> To: freebsd-fs@freebsd.org Subject: external zfs disk keeps writing Message-ID: <op.xll4o1zakndu52@82-171-231-144.ip.telfort.nl>
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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. Regards, Ronald.
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