Date: Sat, 31 Oct 2009 09:39:34 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Kamigishi Rei <spambox@haruhiism.net> Cc: FreeBSD-Current <freebsd-current@freebsd.org>, Scott Long <scottl@FreeBSD.org> Subject: Re: Weird CAM-ATA behaviour (8.0-RC1): disk cloning Message-ID: <4AEBE9B6.6050007@FreeBSD.org> In-Reply-To: <4AEBDDF8.8060609@FreeBSD.org> References: <mailpost.1256930478.6849797.1624.mailing.freebsd.current@FreeBSD.cs.nctu.edu.tw> <4AEBDDF8.8060609@FreeBSD.org>
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Alexander Motin wrote: > Kamigishi Rei wrote: >> I just noticed something weird in my device list (actually, I noticed it >> in "glabel status" output, but then confirmed via camcontrol devlist): I >> got a 7th HDD, ada6, which is, surprisingly, ada0. >> >> This is how it appeared (I've checked the logs): >> >> Oct 27 01:26:38 ameagari sudo: fujibayashi : TTY=pts/3 ; >> PWD=/usr/home/fujibayashi ; USER=root ; COMMAND=/sbin/camcontrol rescan >> 0:0:1 >> Oct 27 01:26:38 ameagari kernel: (aprobe0:ahcich0:0:0:1): SIGNATURE: 0000 >> Oct 27 01:26:38 ameagari kernel: ada6 at ahcich0 bus 0 target 0 lun 1 >> Oct 27 01:26:38 ameagari kernel: ada6: <ST3500320AS SD15> ATA/ATAPI-8 >> SATA 2.x device >> Oct 27 01:26:38 ameagari kernel: ada6: 300.000MB/s transfers >> Oct 27 01:26:38 ameagari kernel: ada6: 476940MB (976773168 512 byte >> sectors: 16H 63S/T 16383C) >> Oct 27 01:26:38 ameagari kernel: ada6: Native Command Queueing enabled >> Oct 27 01:26:38 ameagari kernel: GEOM_MIRROR: Cannot add disk ada6 to >> gm0 (error=17). >> >> While I know I made a mistake there (specifying 0:0:1 instead of 1:0:0), >> is this behaviour really correct? I don't see why we should add a >> 'cloned' disk device on a rescan of LUNs that do not really exist in the >> first place. >> >> This is repeatable and I can create as many clones as I want (by doing >> "camcontrol rescan X:Y:Z" where Y and Z can vary and X is the AHCI bus >> number): > > Interesting effect. By the way it is not an ATA-specific problem. Here is ahc SCSI: %camcontrol devlist <HP HP35470A T503> at scbus0 target 1 lun 0 (sa0,pass0) <HP HP35470A T503> at scbus0 target 1 lun 256 (pass3,sa2) <HP HP35470A T503> at scbus0 target 17 lun 0 (pass2,sa1) -- Alexander Motin
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