Re: minimum valid block size on DVD-RAM
On 07/01/2008, Martin Laabs [EMAIL PROTECTED] wrote: Hi, [...] it works for me perfectly for over a year on a firewall file server, only thing I changed was the default block/frag size for UFS2 to 8096/1024. Only time I hear them spin-up is when periodic runs daily/weekly/monthly. Are you sure you have the frag size set to 1024? This should not work if the drive only supports blocks with a multiple of 2k in size. it seems to work fine. have you tried different DVD-RAM Drive Media? My DVD-RAM is by pioneer something 109 with panasonic branded media How did you create the UFS image for the DVD-RAM? With an image via the md device? This seems actually the only way to gener- ate an ufs filesystem on a dvd-ram for me now. I just treated each disc like a hard disc drive: $ sudo fdisk -BI /dev/acd0 $ sudo bsdlabel -Bw /dev/acd0s1 $ sudo glabel label sys_root /dev/acd0s1a $ sudo glabel label sys_vardb /dev/acd0s1d $ sudo glabel label sys_ulocal /dev/acd0s1e $ sudo newfs -O2 -f 1024 -b 8192 /dev/label/sys_root $ sudo newfs -O2 -f 1024 -b 8192 /dev/label/sys_vardb $ sudo newfs -O2 -f 1024 -b 8192 /dev/label/sys_ulocal $ sudo tunefs -a enable /dev/label/sys_root $ sudo tunefs -a enable /dev/label/sys_vardb $ sudo tunefs -a enable /dev/label/sys_ulocal $ sudo mount -t ufs /dev/label/sys_root /mnt $ sudo mkdir -p /mnt/var/db $ sudo mount -t ufs /dev/label/sys_vardb /mnt/var/db $ sudo mkdir -p /mnt/usr/local $ sudo mount -t ufs /dev/label/sys_ulocal /mnt/usr/local $ cd /usr/src $ su nobody $ env -i make installworld installkernel DESTDIR=/mnt $ exit $ su # echo / /usr/label/sys_root ufs ro 1 1 /mnt/etc/fstab # echo /var/db /usr/label/sys_vardb ufs rw 1 1 /mnt/etc/fstab # echo /usr/local /usr/label/sys_ulocal ufs rw 1 1 /mnt/etc/fstab # echo dumpdev=NO /mnt/etc/rc.conf.local # echo 'entropy_file=/var/db/entropy.db' /mnt/etc/rc.conf.local # echo tmpmfs=YES /mnt/etc/rc.conf.local # echo varmfs=YES /mnt/etc/rc.conf.local # echo background_fsck=NO /mnt/etc/rc.conf.local # echo update_motd=NO /mnt/etc/rc.conf.local # echo clear_tmp_enable=YES /mnt/etc/rc.conf.local # echo ifconfig_em0=DHCP /mnt/etc/rc.conf.local # echo ifconfig_em1=DHCP /mnt/etc/rc.conf.local # sort -o /mnt/etc/rc.conf.local /mnt/etc/rc.conf.local # exit $ shutdown -r now exit boot the disc make other changes as needed, install ports. I am not at home which is where me notes are, so take it with a pinch of salt as it's been months since I did this (on CURRENT, now RELNENG_7). Best regards, Martin Laabs -- Kimi ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
minimum valid block size on DVD-RAM
Hi, I'm investigating a problem concerning the minimum valid block size accepted by DVD (writing) devices when writing on a DVD-RAM. (Please don't mix DVD-R, DVD-RW and DVD-RAM up here.) My motivation for this is the handbook chapter 18.7.9 that describes how to format a DVD-RAM. All listed commands works on a blocksize of 512 byte. This does not work for me on an 'Optiarc DVD RW AD-7170A/1.02' device since it refuse every operation with a blocksize unequal to a multiple of 2048 bytes. The actual inherent (physical) block-/sector size on a DVD-RAM is, like on nearly all other DVDs and CDs, realy 2048 byte so the behaviour of my device makes sense to me. (How should it write a quarter sector?) Now Marc Fonvieille let me know that the instructions in the handbook has been submitted by a DVD-RAM user. This means that these instruction works at least at one system. I'd now like to know whether most of the available DVD-writers are capable of writing blocks smaller than 2k. If not it would be worth investigating an alternativ instruction set. (But this is not as simple as it seems because newfs seems to have a bug with the -S option and also bsdlabel works as default on 512 byte blocks) Since I don't have access to different DVD-writers I can't test their behaviour regarding the minimum accepted block size. Therefore I'd like to ask you for a little test with your DVD-RAM enabled DVD-writer. 1. Insert a DVD-RAM (not DVD-R or DVD-RW!) 2. run 'dd if=/dev/acd0 of=/dev/null bs=512 count=1' (please adjust - if necessary - the device name) 3. run 'dd if=/dev/acd0 of=/dev/null bs=2048 count=1' (please adjust - if necessary - the device name) Please report me whether command 3 and command 2 succeed and also if command 3 succeed and command 2 fails. The first case would mean that your dvd-write is capable of reading blocks smaller that 2048 bytes which would be very surprising for me If you have an empty DVD-RAM (or an DVD-RAM with un- important data) I'd pleased if you could also try a writing test. 1. Insert a DVD-RAM (Remark: *it will be deleted*) 2. run 'dd if=/dev/zero of=/dev/acd0 bs=512 count=1' (please adjust - if necessary - the device name) 3. run 'dd if=/dev/zero of=/dev/acd0 bs=2048 count=1' (please adjust - if necessary - the device name) Please report me whether command 3 and command 2 succeed ans also if command 3 succeed and command 2 fails. The first would mean that your dvd-write is capable of writing blocks with 512 bytes. That would mean that the instruction set of the handbook works for you. My output of the reading an writing test is the following: Reading: # dd if=/dev/acd0 of=/dev/null bs=512 count=1 dd: /dev/acd0: Invalid argument 0+0 records in 0+0 records out 0 bytes transferred in 0.000196 secs (0 bytes/sec) # dd if=/dev/acd0 of=/dev/null bs=2048 count=1 1+0 records in 1+0 records out 2048 bytes transferred in 1.886969 secs (1085 bytes/sec) Writing: # dd if=/dev/zero of=/dev/acd0 bs=512 count=1 dd: /dev/acd0: Invalid argument 1+0 records in 0+0 records out 0 bytes transferred in 0.000205 secs (0 bytes/sec) # dd if=/dev/zero of=/dev/acd0 bs=2048 count=1 1+0 records in 1+0 records out 2048 bytes transferred in 0.001600 secs (1280169 bytes/sec) You see that my device accept read and writes with a blocksize (or a multiple of a blocksize) of 2048 bytes only. Best regards, Martin Laabs ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: minimum valid block size on DVD-RAM
On 07/01/2008, Martin Laabs [EMAIL PROTECTED] wrote: Hi, I'm investigating a problem concerning the minimum valid block size accepted by DVD (writing) devices when writing on a DVD-RAM. (Please don't mix DVD-R, DVD-RW and DVD-RAM up here.) My motivation for this is the handbook chapter 18.7.9 that describes how to format a DVD-RAM. All listed commands works on a blocksize of 512 byte. This does not work for me on an 'Optiarc DVD RW AD-7170A/1.02' device since it refuse every operation with a blocksize unequal to a multiple of 2048 bytes. The actual inherent (physical) block-/sector size on a DVD-RAM is, like on nearly all other DVDs and CDs, realy 2048 byte so the behaviour of my device makes sense to me. (How should it write a quarter sector?) Now Marc Fonvieille let me know that the instructions in the handbook has been submitted by a DVD-RAM user. This means that these instruction works at least at one system. I'd now like to know whether most of the available DVD-writers are capable of writing blocks smaller than 2k. If not it would be worth investigating an alternativ instruction set. (But this is not as simple as it seems because newfs seems to have a bug with the -S option and also bsdlabel works as default on 512 byte blocks) Since I don't have access to different DVD-writers I can't test their behaviour regarding the minimum accepted block size. Therefore I'd like to ask you for a little test with your DVD-RAM enabled DVD-writer. 1. Insert a DVD-RAM (not DVD-R or DVD-RW!) 2. run 'dd if=/dev/acd0 of=/dev/null bs=512 count=1' (please adjust - if necessary - the device name) 3. run 'dd if=/dev/acd0 of=/dev/null bs=2048 count=1' (please adjust - if necessary - the device name) Please report me whether command 3 and command 2 succeed and also if command 3 succeed and command 2 fails. The first case would mean that your dvd-write is capable of reading blocks smaller that 2048 bytes which would be very surprising for me If you have an empty DVD-RAM (or an DVD-RAM with un- important data) I'd pleased if you could also try a writing test. 1. Insert a DVD-RAM (Remark: *it will be deleted*) 2. run 'dd if=/dev/zero of=/dev/acd0 bs=512 count=1' (please adjust - if necessary - the device name) 3. run 'dd if=/dev/zero of=/dev/acd0 bs=2048 count=1' (please adjust - if necessary - the device name) Please report me whether command 3 and command 2 succeed ans also if command 3 succeed and command 2 fails. The first would mean that your dvd-write is capable of writing blocks with 512 bytes. That would mean that the instruction set of the handbook works for you. My output of the reading an writing test is the following: Reading: # dd if=/dev/acd0 of=/dev/null bs=512 count=1 dd: /dev/acd0: Invalid argument 0+0 records in 0+0 records out 0 bytes transferred in 0.000196 secs (0 bytes/sec) # dd if=/dev/acd0 of=/dev/null bs=2048 count=1 1+0 records in 1+0 records out 2048 bytes transferred in 1.886969 secs (1085 bytes/sec) Writing: # dd if=/dev/zero of=/dev/acd0 bs=512 count=1 dd: /dev/acd0: Invalid argument 1+0 records in 0+0 records out 0 bytes transferred in 0.000205 secs (0 bytes/sec) # dd if=/dev/zero of=/dev/acd0 bs=2048 count=1 1+0 records in 1+0 records out 2048 bytes transferred in 0.001600 secs (1280169 bytes/sec) You see that my device accept read and writes with a blocksize (or a multiple of a blocksize) of 2048 bytes only. I can not test now, but everything I had seen previously when looking to use DVD-RAM for a live system instead of using hard drive, plus cheaper easier to backup/replace, points to having a block size of 2048 bytes, even Vista it is the only option and is the default. it works for me perfectly for over a year on a firewall file server, only thing I changed was the default block/frag size for UFS2 to 8096/1024. Only time I hear them spin-up is when periodic runs daily/weekly/monthly. Best regards, Martin Laabs ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] -- Kimi ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: minimum valid block size on DVD-RAM
Hi, [...] it works for me perfectly for over a year on a firewall file server, only thing I changed was the default block/frag size for UFS2 to 8096/1024. Only time I hear them spin-up is when periodic runs daily/weekly/monthly. Are you sure you have the frag size set to 1024? This should not work if the drive only supports blocks with a multiple of 2k in size. How did you create the UFS image for the DVD-RAM? With an image via the md device? This seems actually the only way to gener- ate an ufs filesystem on a dvd-ram for me now. Best regards, Martin Laabs ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
