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    SubjectRe: new Areca driver in 2.6.16-rc6-mm2 appears to be broken
    Date
    Dear Jens Axboe,

    About your request :

    ******************************************
    ** boot with driver MAX_XFER_SECTORS 4096
    ******************************************
    #mkfs.ext2 /dev/sda1
    #mount /dev/sda1 /mnt/sda1
    #cp /root/aa /mnt/sda1/
    #reboot
    ******************************************
    ** boot with driver MAX_XFER_SECTORS 512
    ******************************************
    #fsck /dev/sda1
    /dev/sda1:clean,.............
    #mount /dev/sda1 /mnt/sda1
    #cp /mnt/sda1/aa /home
    cp: reading '/mnt/sda1/aa' : input/output error
    got message : sda1: rw=0, want=...., limit=..... dump

    Best Regards
    Erich Chen

    ----- Original Message -----
    From: "Jens Axboe" <axboe@suse.de>
    To: "erich" <erich@areca.com.tw>
    Cc: <dax@gurulabs.com>; ""(????????????)??????O"" <billion.wu@areca.com.tw>;
    "Al Viro" <viro@ftp.linux.org.uk>; "Andrew Morton" <akpm@osdl.org>;
    "Randy.Dunlap" <rdunlap@xenotime.net>; "Matti Aarnio"
    <matti.aarnio@zmailer.org>; <linux-kernel@vger.kernel.org>; "James
    Bottomley" <James.Bottomley@steeleye.com>; "Chris Caputo" <ccaputo@alt.net>
    Sent: Wednesday, April 19, 2006 6:40 PM
    Subject: Re: new Areca driver in 2.6.16-rc6-mm2 appears to be broken


    > On Wed, Apr 12 2006, erich wrote:
    >> Dear Jens Axboe,
    >>
    >> I had found a big difference of generic_make_request(struct bio *bio)
    >> got message : sdb1: rw=0, want=...., limit=.....
    >>
    >>
    >> *****************
    >> ** TEST 1
    >> *****************
    >>
    >> I used "MAX_XFER_SECTORS 4096" driver to do mkfs.ext2 with ARECA RAID
    >> volume sdb1.
    >> and copy a big file (900MB) into sdb1.
    >> If I copy this file from sdb1, the message rw=.... ,want=......,
    >> limit=...... will appear immediately.
    >>
    >> When I reboot the system and used "MAX_XFER_SECTORS 512" driver.
    >> I copy this big file from sdb1, the message rw=.... ,want=......,
    >> limit=...... still appear immediately.
    >
    > This to me looks like you have a corrupted fs after using the 4k sectors
    > as the max transfer setting. I would look for a bug in the driver that
    > could explain this. Or perhaps the hardware.
    >
    > Can you try and boot with MAX_XFER_SECTORS at 4096 and run mkfs + copy
    > big file to the partition. umount, then boot a kernel with
    > MAX_XFER_SECTORS at 512 and do a full fsck of that partition.
    >
    >
    > --
    > Jens Axboe
    >

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