Date: Sun, 29 Mar 2009 18:51:55 -0500 From: "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org> To: freebsd-fs@freebsd.org Subject: ZFS & USB disks? Message-ID: <49D0099B.2040807@jrv.org>
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uname -a: FreeBSD bigtex.housenet.jrv 8.0-CURRENT FreeBSD 8.0-CURRENT #0 r189099: Fri Feb 27 07:09:47 CST 2009 james@bigtex.housenet.jrv:/usr/obj/usr/src/sys/GENERIC amd64 This build is from before the recent USB changes. Is it safe to use ZFS with USB disk drives? The kernel output suggests "SYNCHRONIZE_CACHE" isn't supported. Does this cause a write-ordering problem for ZFS? Upon attaching a drive with a pool created on a Mac: kernel: vdev_geom_attach:112[1]: Attaching to da4. kernel: vdev_geom_attach:153[1]: Created consumer for da4. kernel: (da4:umass-sim0:0:0:1): SYNCHRONIZE CACHE(10). CDB: 35 0 0 0 0 0 0 0 0 0 kernel: (da4:umass-sim0:0:0:1): CAM Status: SCSI Status Error kernel: (da4:umass-sim0:0:0:1): SCSI Status: Check Condition kernel: (da4:umass-sim0:0:0:1): ILLEGAL REQUEST asc:20,0 kernel: (da4:umass-sim0:0:0:1): Invalid command operation code kernel: (da4:umass-sim0:0:0:1): (da4:umass-sim0:0:0:1): SYNCHRONIZE CACHE(10). CDB: 35 0 0 0 0 0 0 0 0 0 kernel: (da4:umass-sim0:0:0:1): ILLEGAL REQUEST asc:20,0 kernel: (da4:umass-sim0:0:0:1): Invalid command operation code kernel: Unretryable error kernel: (da4:umass-sim0:0:0:1): error 22 kernel: (da4:umass-sim0:0:0:1): Unretryable Error
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