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Date:      Wed, 14 Aug 2013 16:16:23 +0100
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        "Doug Ambrisko" <ambrisko@ambrisko.com>, <sbruno@freebsd.org>
Cc:        FreeBSD-scsi@freebsd.org
Subject:   Re: Dell H310, JBOD mode "hard error"
Message-ID:  <46DE157BA89B4C17B95BE5E738D0B2AF@multiplay.co.uk>
References:  <1373822621.1431.5.camel@localhost> <1376448416.1439.7.camel@localhost> <20130814150331.GB34825@ambrisko.com>

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----- Original Message ----- 
From: "Doug Ambrisko" <ambrisko@ambrisko.com>
To: <sbruno@freebsd.org>
Cc: <FreeBSD-scsi@freebsd.org>
Sent: Wednesday, August 14, 2013 4:03 PM
Subject: Re: Dell H310, JBOD mode "hard error"


> On Tue, Aug 13, 2013 at 07:46:56PM -0700, Sean Bruno wrote:
> | On Sun, 2013-07-14 at 10:23 -0700, Sean Bruno wrote:
> | > Not sure what to make of this.  I've tested a lot of svn revisions of
> | > the thunderbolt code, but nothing looks obvious.  
> | > 
> | > When I use a single drive in "SYSPD" mode on a Dell H310 (falcon or
> | > skinny drake) I get a /dev/mfisyspd0 device.  The JBOD mode *seems* to
> | > work just fine as long as I don't do multiple things at once to it, e.g.
> | > single user fsck works, but multiuser things die.
> | > 
> | > I get a failure case that emits errors such as:
> | > 
> | > g_vfs_done():error 27 in callback
> | > mfisyspd0p2[READ(offset=7176192, length=425984)]mfisyspd0: hard error
> | > error = 5
> | > cmd=read 15360-16383
> | > error 27 in callback
> | > g_vfs_done():mfisyspd0: hard error mfisyspd0p2[READ(offset=7602176,
> | > length=524288)]cmd=read error = 5
> | > 16384-17407
> | > error 27 in callback
> | > g_vfs_done():mfisyspd0: hard error mfisyspd0p2[READ(offset=8126464,
> | > length=524288)]cmd=read error = 5
> | > 14560-15359
> | > error 27 in callback
> | > g_vfs_done():mfisyspd0: hard error mfisyspd0p2[READ(offset=7192576,
> | > length=409600)]cmd=read error = 5
> | > 15360-16383
> | > 
> | > 
> | > Sean
> | 
> | Ah, I see something that Yahoo! does that FreeBSD does not finally.  We
> | tune MAXPHYS *up* to (512 * 1024) because of performance and available
> | memory.
> | 
> | mfi(4) set's its own (MFI_MAXPHYS) to (128 * 1024) instead of using the
> | value from sys/param.h  (btw, I don't quite get why, but whatever).
> | 
> | Without a min() check in mfi_syspd.c that mimics the one in mfi_disk.c,
> | Yahoo code falls over in "SYSPD" mode (mfi(4) real jbod mode).
> | 
> | Patch:
> | 
> | Index: mfi_syspd.c
> | ===================================================================
> | --- mfi_syspd.c (revision 254313)
> | +++ mfi_syspd.c (working copy)
> | @@ -128,7 +128,9 @@
> |  sc->pd_disk->d_drv1 = sc;
> |  sc->pd_disk->d_maxsize = sc->pd_controller->mfi_max_io * secsize;
> |  sc->pd_disk->d_name = "mfisyspd";
> | - sc->pd_disk->d_open = mfi_syspd_open;
> | + sc->pd_disk->d_maxsize = min(sc->pd_controller->mfi_max_io * secsize,
> | + (sc->pd_controller->mfi_max_sge - 1) * PAGE_SIZE);
> | +
> |  sc->pd_disk->d_close = mfi_syspd_close;
> |  sc->pd_disk->d_strategy = mfi_syspd_strategy;
> |  sc->pd_disk->d_dump = mfi_syspd_dump;
> 
> 
> That change for d_maxsize looks okay but do you really want to get
> rid of d_open?  I assume this is a cut-n-paste type error and the patch
> (hand editted) should be:
> 
> Index: mfi_syspd.c
> ===================================================================
> --- mfi_syspd.c (revision 254313)
> +++ mfi_syspd.c (working copy)
> @@ -128,7 +128,8 @@
>  sc->pd_disk->d_drv1 = sc;
> - sc->pd_disk->d_maxsize = sc->pd_controller->mfi_max_io * secsize;
> + sc->pd_disk->d_maxsize = min(sc->pd_controller->mfi_max_io * secsize,
> + (sc->pd_controller->mfi_max_sge - 1) * PAGE_SIZE);
>  sc->pd_disk->d_name = "mfisyspd";
> sc->pd_disk->d_open = mfi_syspd_open;
>  sc->pd_disk->d_close = mfi_syspd_close;
>  sc->pd_disk->d_strategy = mfi_syspd_strategy;
>  sc->pd_disk->d_dump = mfi_syspd_dump;
> 
> BTW, has mfiutil been updated to create real JBODs versus the RAID per
> drive?  I know someone was talking about doing that.  A note on implementing
> it, it also requires JBOD to be enabled in the controller.  I'm not sure
> if all controllers support it.  I forget when I was playing with it.  I've
> always wondering if we should change the name for the syspd disk node
> but I left it for compatibility with LSI.  We could do an alias.  It is
> good in away that it doesn't create /dev/mfid* nodes so that it is easier
> to track bugs.

Some do support native JBOD, some require an additional controller level
setting, and some simply don't support it and I'm not aware of an easy way
to determine which is the case I'm afraid.

Last time I looked mfiutil used RAID not native JBOD for JBOD's

    Regards
    Steve

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