NEC DVD_RW - file read problems.
Hello All, I have the following problem: OS: FreeBSD 4.11-RELEASE. DVD RW: acd0: DVD-R _NEC DVD_RW ND-3500AG at ata1-master UDMA33 I use DVD R's primary for data backup. The backup data is archived and splitted on files ~500Mb size, which was written on DVD-R's. I have also store the MD5 sums of those files in small checksum file. The problem is: sometimes then i check content on DVD the checksum is differs. Where is no read errors on console, and several attempts to calculate checksum return different results. bash-2.05b# grep 1 /cdrom/md5.sums acc8b491f03bfa01e341808773a6f94f depot.147.tar.1 bash-2.05b# md5 /cdrom/depot.147.tar.1 MD5 (/cdrom/depot.147.tar.1) = d821bd902c4b0e9c12510f302c10ee71 # File seems cached in RAM bash-2.05b# md5 /cdrom/depot.147.tar.1 MD5 (/cdrom/depot.147.tar.1) = d821bd902c4b0e9c12510f302c10ee71 bash-2.05b# umount /cdrom # After unmounting and mounting again - different (correct) checksum. bash-2.05b# !mou mount /cdrom bash-2.05b# md5 /cdrom/depot.147.tar.1 MD5 (/cdrom/depot.147.tar.1) = acc8b491f03bfa01e341808773a6f94f # Now the checksum is OK. It seems for me that sometimes device correct soft read errors on media, and sometimes - does not. Does anybody have the same expirience (i.e. checksum differs without read errors) ? Best Regards, Alexander Derevyanko ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: NEC DVD_RW - file read problems.
I have already checked memory - all checks went OK. From: 25.10.2005 07:40:35 Andrew P. [EMAIL PROTECTED] To:Aleksandr Derevianko/RU/Transport/[EMAIL PROTECTED] cc:freebsd-questions@freebsd.org Security Level:? Internal Subject: Re: NEC DVD_RW - file read problems. On 10/25/05, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Hello All, I have the following problem: OS: FreeBSD 4.11-RELEASE. DVD RW: acd0: DVD-R _NEC DVD_RW ND-3500AG at ata1-master UDMA33 I use DVD R's primary for data backup. The backup data is archived and splitted on files ~500Mb size, which was written on DVD-R's. I have also store the MD5 sums of those files in small checksum file. The problem is: sometimes then i check content on DVD the checksum is differs. Where is no read errors on console, and several attempts to calculate checksum return different results. bash-2.05b# grep 1 /cdrom/md5.sums acc8b491f03bfa01e341808773a6f94f depot.147.tar.1 bash-2.05b# md5 /cdrom/depot.147.tar.1 MD5 (/cdrom/depot.147.tar.1) = d821bd902c4b0e9c12510f302c10ee71 # File seems cached in RAM bash-2.05b# md5 /cdrom/depot.147.tar.1 MD5 (/cdrom/depot.147.tar.1) = d821bd902c4b0e9c12510f302c10ee71 bash-2.05b# umount /cdrom # After unmounting and mounting again - different (correct) checksum. bash-2.05b# !mou mount /cdrom bash-2.05b# md5 /cdrom/depot.147.tar.1 MD5 (/cdrom/depot.147.tar.1) = acc8b491f03bfa01e341808773a6f94f # Now the checksum is OK. It seems for me that sometimes device correct soft read errors on media, and sometimes - does not. Does anybody have the same expirience (i.e. checksum differs without read errors) ? Best Regards, Alexander Derevyanko ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] Проверь память. Поставь на ночь memtest или docmemory. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Multiple bootable FreeBSD disks in the same system
Hello ! I'm attempting to build the Vinum-based file server. The structure is following: 1. 5 equial-sized drives, 180 real Gbytes. 2. All drives have the same structure. 1 Partition (adXs1) divided in 3 slices: adXs1a - 128Mb ufs adXs1b - 128 Mb swap adXs1d - vinum partition. /usr, /var, /tmp is on vinum partition. Root partition is copied on every HD in the system. Vinum works, system boots OK, but if i take out drive number 0 (bootable), and attempt to boot from another drive, system refuses to boot with Can't mount root message. Of course, fstab is wrong, but i'm expecting at least boot in single-user - it doesn't, just reboots. The problem is: Before this message, system ask for root filesystem (in form ufs:/dev/adXs1a), but it seems like it doesn't see it. I have found the solution to this problem - in loader prompt enter boot -a, the kernel boots, shows exactly the same prompt as previously for root filesystem, and proceed without any problems. If i change wiring to make another drive ad0, it works without problems at all. OS version: FreeBSD 4.11 RELEASE, GENERIC kernel. All drives are bootable (standart MBR, dos partition active, disklabel -B). Best Regards, Alexander Derevyanko ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
How to find out the type of CD in burner from script ?
Hello ! I have the following problem: I'm writing backup scripts, to store SCM tree on CD via ATAPI CD-burner. I need to have ability from inside the script find out the type of CD in burner: Is it CD-R or CD-RW, and is it blank or not, and also obtain at least CD label without mounting CD. Search in mail archive does nothing, so if anybody know how to do this, please respond. P.S. I'm using FreeBSD 4.8 and PLEXTOR CD-R PX-W4824A. Best regards, Alexander. ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: How to find out the type of CD in burner from script ?
No, i can't use cdrecord. It is for SCSI CD-writers, and i have ATAPI. Best regards, Alexander Shantanoo Mahajan [EMAIL PROTECTED] on 09.10.2003 17:34:03 To: Aleksandr Derevianko/RU/Transport/[EMAIL PROTECTED] cc: [EMAIL PROTECTED] Security Level:? Internal Subject: Re: How to find out the type of CD in burner from script ? +-- [EMAIL PROTECTED] [freebsd] [09-10-03 19:05 IST]: | Hello ! | | I have the following problem: I'm writing backup scripts, to store SCM tree on | CD via ATAPI CD-burner. | I need to have ability from inside the script find out the type of CD in burner: | Is it CD-R or CD-RW, and is it blank or not, | and also obtain at least CD label without mounting CD. | | Search in mail archive does nothing, so if anybody know how to do this, please | respond. | | P.S. I'm using FreeBSD 4.8 and PLEXTOR CD-R PX-W4824A. | | Best regards, | Alexander. If you are using cdrecord, you may be interested in # cdrecord -scanbus -- With Best Regards, Shantanoo Mahajan ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
