Date: Tue, 03 Jan 2012 15:38:23 +0100 From: Peter Maloney <peter.maloney@brockmann-consult.de> To: freebsd-fs@freebsd.org Subject: Re: ZFS With Gpart partitions Message-ID: <4F0312DF.8050004@brockmann-consult.de> In-Reply-To: <4F0311F2.7050209@brockmann-consult.de> References: <4F003EB8.6080006@dannysplace.net> <CALfReyfvOCMpBdndf7UYydmGnUqt2cBYWdhYXaOANbQ_CFHoVA@mail.gmail.com> <4F02FC42.1040103@dannysplace.net> <4F0311F2.7050209@brockmann-consult.de>
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On 01/03/2012 03:34 PM, Peter Maloney wrote: > On 01/03/2012 02:01 PM, Dan Carroll wrote: >> On 3/01/2012 10:27 PM, krad wrote: >>> Just a not you dont appear to be 4k aligned on this drive. As the >>> drive capacity is > 1.5 Tb you probably should be. You will also be >>> ashift=9 as well. This may or may not be a problem for you. >> That was intentional, as I *thought* these drives were not 4k sector >> drives. I am not sure how I am supposed to tell. They are WD RE4 >> drives. >> I confess, however to knowing nothing about ashift=9..... Could you >> elaborate? > Read this thread: > > ZFS using 'advanced format drives' with FreeBSD (8.2-RC3) > http://forums.freebsd.org/showthread.php?t=21644 > > (and of course don't play around and run the dd command, etc. for disks > with valuable data on them) > And looking at dmesg or /var/log/messages should probably tell you what your sector size is. eg. # dmesg | grep "da2:" or # grep "da2:" /var/log/messages or # bunzip2 -c /var/log/messages.1.bz2 | grep "da2:" Nov 28 13:59:35 bcnas1 kernel: da2: <ATA ST33000650NS 0002> Fixed Direct Access SCSI-6 device Nov 28 13:59:35 bcnas1 kernel: da2: 600.000MB/s transfers Nov 28 13:59:35 bcnas1 kernel: da2: Command Queueing enabled Nov 28 13:59:35 bcnas1 kernel: da2: 2861588MB (5860533168 *512 byte sectors*: 255H 63S/T 364801C) >> -D >> _______________________________________________ >> freebsd-fs@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-fs >> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > -- -------------------------------------------- Peter Maloney Brockmann Consult Max-Planck-Str. 2 21502 Geesthacht Germany Tel: +49 4152 889 300 Fax: +49 4152 889 333 E-mail: peter.maloney@brockmann-consult.de Internet: http://www.brockmann-consult.de --------------------------------------------
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