Hello Eric, mind you, I am no bacula expert myself (yet), but I spent some time to get it running with REV-drives, which is quite similar to DVD-RAM in terms of actual usage.
Eric Böse-Wolf schrieb: > But DVD-RAM could be used like a harddrive, just put in the DVD-RAM > and use e.g. /dev/hda as device, but then Bacula have to check if the > media is full. Otherwise you could create udf 2.01 on the DVD and mount > it, but then you don't need a special writing tool like "dvd-handler" > From Bacula. Exactly. Apparently bacula does not like writing to raw devices if they are anything else but tapes. So if it can be used "like a harddrive" (which includes DVD-RAM) you are probably best off using files on the medium. If you do that, bacula recognizes a full medium without any problems too. It even treats a file on a UDF medium as "full" when it hits the 1Gb limit - see below. > Another Problem could be that kernels lower (strictly) 2.6.22 cannot > create files larger than 1 GB on an DVD-RAM with udf, so back to direct > writing on the DVD-RAM without filesystem .... ? That was a _major_ showstopper for me, since REVs also use UDF. There are 2 ways to circumvent this problem as far as I know: A) Use the virtual autochanger script that a community member kindly provided. Look in the list archives for a mail about "Bacula Removable Disk Howto". I can also provide you the article if you cannot find it. Using this, you can treat each DVD-RAM medium as an autochanger containing several volumes, each one being a file of 1Gb in size. This might still be acceptable for DVD-RAM, but in my case, having about 65Gb of space per medium, that would have created a LOT of volumes. B) Format the medium with another non-journaling filesystem (like ext3 without the journal option) and then use larger files. This sounds like a _very_ bad idea at first glance, but in my tests, it worked surprisingly well - i.e. without too much stress on the drive or medium. This may be due to the fact that bacula mostly does sequential writes, not completely random access. However, it certainly creates more stress than UDF. I will take a backup system using this type of configuration into production use next week, so if you have some time, I can keep you in the loop. > I don't know if one could just use the tapedrive drivers for dvd-ram, as > I don't know if the ioctl's are the same or so. I tried that with REVs and it went spectacularly wrong, because bacula insisted on rewinding the medium at some point. ;) CYa Mike -- T²BF IT Services GbR Daniel Blömer, Mike Follwerk, Marcus Teske Marie-Curie-Str. 1 D-53359 Rheinbach Umsatzsteuer-Identifikationsnummer gem. § 27 a Umsatzsteuergesetz: DE 238268154 Tel. +492226 / 87 21 40 Fax: +492226 / 87 21 49 http://www.tbf-it.de/ ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
