How can I use BD-RE with UFS on geli?

[SAITOU Toshihide]

From: SAITOU Toshihide <toshi at ruby.ocn.ne.jp>
Subject: Re: How can I use BD-RE with UFS on geli?
Date: Wed, 15 Apr 2009 19:45:48 +0900 (JST)

> In message: <20090412.134212.260812222.toshi at ruby.ocn.ne.jp>
>             SAITOU Toshihide <toshi at ruby.ocn.ne.jp> writes:
>> I tried BD-RE with UFS on geli but didn't success.
>> What was wrong the below?
> 
> P.S.  BD-RE with UFS is the same result (not usable).
> 
> 
> 1. format the disk
> 
>    dvd+rw-format is failed but after this step the disk is
>    newfs-able.
> 
>    # diskinfo -v /dev/acd0
>    /dev/acd0
>            2048            # sectorsize
>            8796093020160   # mediasize in bytes (8.0T)
>            4294967295      # mediasize in sectors
> 
>    # kldload atapicam
>    # dvd+rw-format /dev/cd0
>    # kldunload atapicam
> 
>    # diskinfo -v /dev/acd0 
>    /dev/acd0
>            2048            # sectorsize
>            24220008448     # mediasize in bytes (23G)
>            11826176        # mediasize in sectors
> 
> 2. newfs
> 
>    # newfs /dev/acd0
> 
>    the following message was detected:
> 
>    kernel: acd0: FAILURE - READ_BIG MEDIUM ERROR asc=0x11 ascq=0x05 
> 
> 
> 3. glabel and mount
> 
> 
> but the disk access frequently failed with these messages
> (offset and length is not always the same):
> 
> kernel: acd0: FAILURE - READ_BIG MEDIUM ERROR asc=0x11 ascq=0x05 
> kernel: g_vfs_done():label/DailyBackup[READ(offset=2697789440, length=16384)]error = 5
> 

Since I wrote this message and did something, I rarely see
the READ_BIG MEDIUM ERROR error for now, almost ok, thanks.

This is something I did JFYI:

* firmware update
* gnome and related ports update
  (include devel/fam to devel/gamin change)
* sector size change

   # dd if=/dev/zero bs=2048 count=1 of=/dev/acd0
   (new media emits READ_BIG MEDIUM ERROR, maybe inevitable(?))

   # geli init -s 4096 /dev/acd0
   # geli attach acd0

   # dd if=/dev/zero bs=4194304 count=256 of=/dev/acd0.eli
   256+0 records in
   256+0 records out
   1073741824 bytes transferred in 347.738376 secs (3087786 bytes/sec)

   # newfs -b 65536 -S 4096 /dev/acd0.eli
   # glabel label -v DailyBackup /dev/acd0.eli

   # mount /dev/label/DailyBackup /od
   # tar cf - foo | gzip -9 | dd bs=65536 if=/dev/stdin of=/od/foo.tgz &
   18697+2 records in
   18697+2 records out
   1225348564 bytes transferred in 733.809511 secs (1669846 bytes/sec)

The theoretical transfer speed is 4.5MB/s (288 Mbps) so this
is slow even I use the x2 BD-RE media and drive but I don't
know which part is saturated.

Thanks,

----
SAITOU Toshihide