On Thursday 19 July 2007 16:51, Mariusz Czulada wrote: > Hello, > > Dnia 19-07-2007 o godz. 14:36 Kern Sibbald napisał(a): > > On Thursday 19 July 2007 13:49, Mariusz Czulada wrote: > > > Hi all, > > > > > > I didn't give up so made my own investigation. Now it seems I found the > > > source of my problem. I'll describe what I discovered. I need your help > > > to verify if it is a good way and how to include required changes into > > > bacula code. > > > > > > First reference materials: > > > > > > Programming reference (PRGOGREF): > > > ftp://ftp.software.ibm.com/storage/devdrvr/Doc/IBM_Tape_Driver_PROGREF. > > >pdf Setup and operator guide (SOG): > > > ftp://ftp.software.ibm.com/storage/3576R1_SOG.pdf > > > > > > And a remainder of my environment: > > > > > > I use an IBM xSeries host with CentOS 4.3. DDS-5 internal drive > > > (working perfectly), and IBM TS3310 tape library, with two LTO-3 drives > > > connected directly (i mean without FC switch) to two QLogic QLA2460 > > > HBA. IBM tape drivers taken from IBM site. Catalog is created in > > > PostgreSQL 8.1.5. Bacula 2.0.2. Both pg and bacula compiled from > > > sources. > > > > > > ----------------- > > > > > > [....] > > > > First to talk about the code above: this is very special case code that > > is > > machine dependent, and so it is not really appropriate to add to Bacula, > > if > > that is what you are suggesting, as Bacula tries where ever possible to > > be platform neutral. In addition, most of the information you want above > > is normally placed in the system log. > > Accept it. > > > Concerning the error code returned and the special case which shows that > > an > > EOT was reached. I believe that this is either that you have not > > configured > > the directives in your Device resource correctly for your tape driver > > (not always easy) or a bug in the kernel scsi driver for that device. > > Bacula should not receive an I/O error code if an EOT is reached. > > I assume that I could still misconfigured the devices. The truth is, > that as a not very experienced bacula user I have problems with setting > proper options, while checking all possible yes/no permutations is not > reasonable. Thats why I was hoping for hints from users (almost all I > set was 'btape test' based). Can hardly imagine that noone uses IBM > drives/libraries nor QLogic HBAs.
If you have HBAs in the loop, this is the very first thing I would check. It is very likely they add caching to speed up throughput. The key word is "caching" -- that is the question to ask IBM or QLogic is does it "cache", and if so how do I turn it off. Regards, Kern > > > I would recommend that you look at the existing Bacula code and assume > > it is > > correct, then figure out if there are any existing Bacula directives that > > allow you to adapt Bacula to properly interpret the codes that are coming > > back from the kernel driver. If this is not the case, then look at the > > codes > > that the Bacula device driver expects and complain to your OS supplier > > that > > his tape driver does not conform to Unix standards, which work perfectly > > fine > > on Linux, Solaris, and FreeBSD. > > For sure, my workaround will be Plan B. > > > One other thought, since you mention FC. You may be running with some > > software or hardware that is caching the data and status codes between > > the tape drive and Bacula. HP HBA's do so by default. Bacula works with > > the drive in synchronous mode. If something buffers data and/or returned > > status > > codes, it will *never* work with Bacula -- Bacula will not see the LEOT > > marker nor the EOT marker (status codes) at the correct time, so will > > fail. > > This is a point I could find any info about. I checked Qlogic site, IBM > site (FC card is in fact QLA2460, but IBM branded) but found nothing > about synchronous mode. Perhaps it is named as different parameter or > option, but could not identify it. If someone knows more about this HBA > I will really apreciate your help. > > > Regards, > > > > Kern > > > > > TIA for your comments, > > > > > > Mariusz Czułada > > > > > > ---------------------------------------------------- > > > Już w ten piątek Ty i Ona o godz. 16:00 w Sopocie na molo! Będziesz? > > ---------------------------------------------------- > Zapraszamy na XXVI Festiwal Piknik Country Mrągowo 2007! > W ostatni weekend lipca - wielkie muzyczne wydarzenie! > http://klik.wp.pl/?adr=http%3A%2F%2Fadv.reklama.wp.pl%2Fas%2Fpiknikcountry. >html&sid=1229 > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Bacula-devel mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/bacula-devel ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
