Re: Multi Volume CD/DVDs
Pardon my ignorance, but I would like to ask what is the commonly practiced method of creating multi-volume disks. You must be referring to Volume Sequence Number defined for ISO9660 data-set. I myself would first wonder how common is support for *accessing* of such multi-volume data-sets. Note that I'm not saying that I know answer to either question, but I won't be surprised if support for multi-volume *access* turns to be commonly poor. That is, for instance I need to burn a directory that has files whose combined size is, say 12 GB. How would one go about creating multiple ISO9660 images from it and then burning them on CD/DVDs. Is there a way that these images can themselves keep track of information like their position in the sequence, total number of images that constitute the complete dataset etc. Once again you probably should first wonder if and how target OS can use this multi-volume field, because if it doesn't treat it in the way you expect it to, then figuring out how to create multi-volume data-set won't solve the problem. Also, what if the things are complicated by the existence of one or more files of size 2GB. Is this a Linux only issue? Note that it's not an inherent Linux limitation, but Linux isofs implmentation issue. I mean you can access files larger than 2GB under Linux, but not those residing on ISO9660 volume. And the fact that Linux exhibits this deficiency doesn't mean that *all* other implementations are bug-free. I mean breaking 2GB limit is indeed a problem with Linux isofs implementation, but given this fact alone one can't tell that it's not a problem on some other given OS. Is this an issue on 64 bit SGI IRIX systems? I don't think anybody would be able to answer this question definitely. The only way is to try... Keep in mind that in Linux it's rather signed vs. unsigned than 32- vs. 64-bit issue. A. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: Multi Volume CD/DVDs
... I would like to ask what is the commonly practiced method of creating multi-volume disks. That is, for instance I need to burn a directory that has files whose combined size is, say 12 GB. How would one go about creating multiple ISO9660 images from it and then burning them on CD/DVDs. A few years ago i was faced with the same problem and my solution is available as open source software : http://scdbackup.webframe.org/scdbackup-0.8.tar.gz see file README Homepage : http://scdbackup.webframe.org/main_eng.html In respect to other comments i have read so far : scdbackup does not use exotic ISO 9660 features. It produces plain independend ISO filesystems (+RockRidge) on several CDs. To Andy : Hi, scdbackup is one of the off-list answers sent to Norbert Preining about his request for a 'good' backup program. I was reluctant to advertise my stuff as such a thing. Ashish Rangole on the other hand asked for a central feature of scdbackup which i am proud to present. Worthless, of course, without mkisofs, afio, cdrecord or growisofs. (Taking a bow) Is there a way that these images can themselves keep track of information like their position in the sequence, total number of images that constitute the complete dataset etc. scdbackup-0.8 maintains a list of checksum records (MD5) which may be used to identify a volume of a multi volume backup. Those records tell date, total number of volumes and sequence number of the given volume. But this needs to read the whole media and will fail if the media is damaged. (It's actually intended for verifying write success.) So you will be better off with a leaflet of paper which holds the desired information in human readable form. Paint unique, permanent ID numbers on your media and refer to them on the leaflet. (Staedler Lumocolor pens seem to do no harm to the surface of a CD-RW. I never tested Edding pens.) Also, what if the things are complicated by the existence of one or more files of size 2GB. That depends wether the affected programs got compiled with Large File Support. I was told that mkisofs of cdrtools-2.01a19 has that feature (there are newer releases meanwhile). Is this a Linux only issue? Traditional functions and data structures of the file system interface used 32-bit signed integers (e.g. fseek got parameter long offset ). With Linux (and others) there are compile time macros which switch to more modern data types : _FILE_OFFSET_BITS=64 _LARGEFILE_SOURCE Is this an issue on 64 bit SGI IRIX systems? I suppose that SGI's own programs do support large files while possibly some third-party programs don't. scdbackup's programs get compiled with Large File Support. You will also need mkisofs with that feature (see above). Nevertheless, when creating ISO 9660 filesystems, scdbackup can not handle files which are larger than a single media. Therefore files 2GB can only be backuped on DVD (scdbackup uses growisofs to write the media) or in format afio (large file support since afio-2.4.7.9beta4). Have a nice day :) Thomas -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: Multi Volume CD/DVDs
To Andy : scdbackup is one of the off-list answers sent to Norbert Preining about his request for a 'good' backup program. Please note that I'm not blaming [nor in position to blame] anybody for choices they make. I merely *encoraged* public to open up, as it felt there is a need for that. My comment was *not* based solely on that particular remark, so don't take it personally. I was reluctant to advertise my stuff as such a thing. Modesty is of course valuable quality, but keep in mind that it's a *discussion* forum. Statement or proposed solution doesn't have to be 100% correct or perfectly suitable for some particular situation. That's why we *discuss* it, don't we? scdbackup-0.8 maintains a list of checksum records (MD5) which may be used to identify a volume of a multi volume backup. Great! Also, what if the things are complicated by the existence of one or more files of size 2GB. That depends wether the affected programs got compiled with Large File Support. I was told that mkisofs of cdrtools-2.01a19 has that feature (there are newer releases meanwhile). Is this a Linux only issue? Traditional functions and data structures of the file system interface used 32-bit signed integers (e.g. fseek got parameter long offset ). Once again. Keep in mind that Linux isofs implementation is deficient in such way which effectively limits maximum file size to 2G-1 byte. I mean even if kernel itself supports large files and all application programs are explicitly compiled with large file support, you still get into trouble [as long as we're talking about ISO9660 that is]. I assumed that Ashish was referring to this limitation, as it was discussed serveral times on this list. I might be wrong in my assumption (but that's OK as already established:-). Cheers. A. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: Multi Volume CD/DVDs
On Fri, 19 Mar 2004 [EMAIL PROTECTED] wrote: On Fri, 19 Mar 2004, Andy Polyakov wrote: My comment was *not* based solely on that particular remark, so don't take it personally. No offense taken. And if ever ... your merits would outweight it. scdbackup-0.8 maintains a list of checksum records (MD5) which may be used to identify a volume of a multi volume backup. Great! ... and it got a bash script on each CD/DVD which tells you the volume number, the date and can tell you on which volume a file may be found. (Silly me, that would have been the better answer.) Once again. Keep in mind that Linux isofs implementation is deficient in such way which effectively limits maximum file size to 2G-1 byte. I was not aware of that. Still using CD-RW and only getting reports from my DVD users. At least one of them got happy with large files after pointing me to the lack of Large File Support in scdbackup-0.7 . Conclusion so far : For files larger than 2 GB i can only propose to use afio format rather than ISO. Again: get at least afio-2.4.7.9beta4 for that and make thorough tests including real restore experiments. Be aware that 4 GB might be another limit. Have a nice day :) Thomas -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: Multi Volume CD/DVDs
... I would like to ask what is the commonly practiced method of creating multi-volume disks. That is, for instance I need to burn a directory that has files whose combined size is, say 12 GB. How would one go about creating multiple ISO9660 images from it and then burning them on CD/DVDs. A few years ago i was faced with the same problem and my solution is available as open source software : http://scdbackup.webframe.org/scdbackup-0.8.tar.gz see file README Homepage : http://scdbackup.webframe.org/main_eng.html In respect to other comments i have read so far : scdbackup does not use exotic ISO 9660 features. It produces plain independend ISO filesystems (+RockRidge) on several CDs. To Andy : Hi, scdbackup is one of the off-list answers sent to Norbert Preining about his request for a 'good' backup program. I was reluctant to advertise my stuff as such a thing. Ashish Rangole on the other hand asked for a central feature of scdbackup which i am proud to present. Worthless, of course, without mkisofs, afio, cdrecord or growisofs. (Taking a bow) Is there a way that these images can themselves keep track of information like their position in the sequence, total number of images that constitute the complete dataset etc. scdbackup-0.8 maintains a list of checksum records (MD5) which may be used to identify a volume of a multi volume backup. Those records tell date, total number of volumes and sequence number of the given volume. But this needs to read the whole media and will fail if the media is damaged. (It's actually intended for verifying write success.) So you will be better off with a leaflet of paper which holds the desired information in human readable form. Paint unique, permanent ID numbers on your media and refer to them on the leaflet. (Staedler Lumocolor pens seem to do no harm to the surface of a CD-RW. I never tested Edding pens.) Also, what if the things are complicated by the existence of one or more files of size 2GB. That depends wether the affected programs got compiled with Large File Support. I was told that mkisofs of cdrtools-2.01a19 has that feature (there are newer releases meanwhile). Is this a Linux only issue? Traditional functions and data structures of the file system interface used 32-bit signed integers (e.g. fseek got parameter long offset ). With Linux (and others) there are compile time macros which switch to more modern data types : _FILE_OFFSET_BITS=64 _LARGEFILE_SOURCE Is this an issue on 64 bit SGI IRIX systems? I suppose that SGI's own programs do support large files while possibly some third-party programs don't. scdbackup's programs get compiled with Large File Support. You will also need mkisofs with that feature (see above). Nevertheless, when creating ISO 9660 filesystems, scdbackup can not handle files which are larger than a single media. Therefore files 2GB can only be backuped on DVD (scdbackup uses growisofs to write the media) or in format afio (large file support since afio-2.4.7.9beta4). Have a nice day :) Thomas
Re: Multi Volume CD/DVDs
To Andy : scdbackup is one of the off-list answers sent to Norbert Preining about his request for a 'good' backup program. Please note that I'm not blaming [nor in position to blame] anybody for choices they make. I merely *encoraged* public to open up, as it felt there is a need for that. My comment was *not* based solely on that particular remark, so don't take it personally. I was reluctant to advertise my stuff as such a thing. Modesty is of course valuable quality, but keep in mind that it's a *discussion* forum. Statement or proposed solution doesn't have to be 100% correct or perfectly suitable for some particular situation. That's why we *discuss* it, don't we? scdbackup-0.8 maintains a list of checksum records (MD5) which may be used to identify a volume of a multi volume backup. Great! Also, what if the things are complicated by the existence of one or more files of size 2GB. That depends wether the affected programs got compiled with Large File Support. I was told that mkisofs of cdrtools-2.01a19 has that feature (there are newer releases meanwhile). Is this a Linux only issue? Traditional functions and data structures of the file system interface used 32-bit signed integers (e.g. fseek got parameter long offset ). Once again. Keep in mind that Linux isofs implementation is deficient in such way which effectively limits maximum file size to 2G-1 byte. I mean even if kernel itself supports large files and all application programs are explicitly compiled with large file support, you still get into trouble [as long as we're talking about ISO9660 that is]. I assumed that Ashish was referring to this limitation, as it was discussed serveral times on this list. I might be wrong in my assumption (but that's OK as already established:-). Cheers. A.
Re: Multi Volume CD/DVDs
On Fri, 19 Mar 2004 [EMAIL PROTECTED] wrote: On Fri, 19 Mar 2004, Andy Polyakov wrote: My comment was *not* based solely on that particular remark, so don't take it personally. No offense taken. And if ever ... your merits would outweight it. scdbackup-0.8 maintains a list of checksum records (MD5) which may be used to identify a volume of a multi volume backup. Great! ... and it got a bash script on each CD/DVD which tells you the volume number, the date and can tell you on which volume a file may be found. (Silly me, that would have been the better answer.) Once again. Keep in mind that Linux isofs implementation is deficient in such way which effectively limits maximum file size to 2G-1 byte. I was not aware of that. Still using CD-RW and only getting reports from my DVD users. At least one of them got happy with large files after pointing me to the lack of Large File Support in scdbackup-0.7 . Conclusion so far : For files larger than 2 GB i can only propose to use afio format rather than ISO. Again: get at least afio-2.4.7.9beta4 for that and make thorough tests including real restore experiments. Be aware that 4 GB might be another limit. Have a nice day :) Thomas
Multi Volume CD/DVDs
Pardon my ignorance, but I would like to ask what is the commonly practiced method of creating multi-volume disks. That is, for instance I need to burn a directory that has files whose combined size is, say 12 GB. How would one go about creating multiple ISO9660 images from it and then burning them on CD/DVDs. Is there a way that these images can themselves keep track of information like their position in the sequence, total number of images that constitute the complete dataset etc. Also, what if the things are complicated by the existence of one or more files of size 2GB. Is this a Linux only issue? Is this an issue on 64 bit SGI IRIX systems? I did read mkisofs man page but could not understand how exactly to get this done. Please advise. I shall really appreciate any response. Thanks in advance for your time and help. Ashish -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Multi Volume CD/DVDs
Pardon my ignorance, but I would like to ask what is the commonly practiced method of creating multi-volume disks. That is, for instance I need to burn a directory that has files whose combined size is, say 12 GB. How would one go about creating multiple ISO9660 images from it and then burning them on CD/DVDs. Is there a way that these images can themselves keep track of information like their position in the sequence, total number of images that constitute the complete dataset etc. Also, what if the things are complicated by the existence of one or more files of size 2GB. Is this a Linux only issue? Is this an issue on 64 bit SGI IRIX systems? I did read mkisofs man page but could not understand how exactly to get this done. Please advise. I shall really appreciate any response. Thanks in advance for your time and help. Ashish
