Date: Sat, 27 Sep 2014 15:15:12 -0700 From: Mehmet Erol Sanliturk <m.e.sanliturk@gmail.com> To: Jin Guojun <jguojun@sbcglobal.net> Cc: "hackers@freebsd.org" <hackers@freebsd.org>, questions freebsd <questions@freebsd.org> Subject: Re: Inproper ada# assignment in 10-BETA2 Message-ID: <CAOgwaMu71N0697%2BDUOJC7cy-Z3XenEGxwKLY%2B-q_LoMZLgPY6w@mail.gmail.com> In-Reply-To: <1411851225.9364.YahooMailNeo@web180902.mail.ne1.yahoo.com> References: <1411851225.9364.YahooMailNeo@web180902.mail.ne1.yahoo.com>
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On Sat, Sep 27, 2014 at 1:53 PM, Jin Guojun <jguojun@sbcglobal.net> wrote: > Installed 10-BETA2 on SATA port 4 (ad8) and then added another SATA port 3 > (ad6), the system has not correctly enumerate the ada # for the boot device. > As original boot (without the second SATA drive), the ad8 is enumerated as > ada0 -- the boot drive: > > Sep 24 22:51:30 R10-B2 kernel: ada0 at ahcich2 bus 0 scbus2 target 0 lun 0 > Sep 24 22:51:30 R10-B2 kernel: ada0: <Hitachi HDP725050GLA360 GM4OA50E> > ATA-8 SATA 2.x device > ... > Sep 24 22:51:30 R10-B2 kernel: ada0: Previously was known as ad8 > > > However, after added another SATA drive (ad6), this new drive is assigned > to ada0, but ad8 has changed to ada1. This is incorrect dynamic device > assignment. FreeBSD has kept using fixed disk ID assignment due to the same > problem introduced in around 4-R (or may be slightly later), and after a > simple debate, a decision was made to use fixed drive ID to avoid such > hassle. > > If now we want to use dynamic enumeration for drive ID# assignment, this > has to be done correctly -- boot drive MUST assigned to 0 or whatever the # > as installation assigned to; otherwise, adding a new drive will cause > system not bootable, or make other existing drive not mountable due to > enumeration # changes. > > Has this been reported as a known problem for 10-R, or shall I open a bug > to track? > > -Jin > One point should be checked : On mainboards SATA ports are numbered from 0 or 1 to upward . BIOS always uses first SATA drive for boot . This is NOT related to the operating system . Therefore , it is necessary to check port numbers of existing drives and the bootable SATA drive should be connected to the smallest numbered SATA port among existent drives . For example , assume bootable drive is connected to SATA port 2 . New drive should be connected to a higher numbered SATA port . If there are only two SATA ports , then bootable drive should be connected to the first SATA port . If mainboard BIOS allows definition of any SATA port for boot , and bootable SATA port and drive is specified in there , again it may boot from that drive . Up to now , I did not see any BIOS which supplies such an ordering among SATA ports . Please check your BIOS for such a feature . If it is present you may use it , otherwise it is necessary to reconnect SATA cables . Thank you very much . Mehmet Erol Sanliturk
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