Zitat von Alan Brown <a...@mssl.ucl.ac.uk>: > On 21/08/12 12:27, lst_ho...@kwsoft.de wrote: > >> So i still wonder why the manual recommend not to change this value? > > Because some (older) drive types don't like it and will break.
Of course but the manual as far as i understand explicitely discourage altering the value for Block Size with modern hardware: "On most modern tape drives, you will not need to specify this directive.." So it should be more of don't alter this value for old tape drives and don't alter the value after first tape usage or you will not be able to restore. >> The problem of not mixing the blocksize is obvious so if there is not >> other downside one should choose a larger value with any recent tape >> drive, no? > > It's only obvious to those experienced with tape. Inexperienced > admins are likely to end up with non-restorable tapes due to mixed > blocksizes on one volume and not realise what they've done until > it's far too late. Given the complexity of backup/restore and the knowledge required a big *warning* in the manual should be sufficient i guess... > LTO drives can handle blocksize up to 16Mb. I suspect that moving to > 4 or 8Mb would result in better throughput but that isn't an option > at the moment. > > Similarly, the 64kb network block size isn't really large enough for > Gb/10Gb-scale networks but in my experience setting larger values > causes problems inside bacula. > > Alan With this in mind i really wonder how many Bacula installations setup the last 5 years are running with shoe-shining tape drives despite the fact that Bacula can do better. Thanks for your help on this one Moving to next part of the puzzle ;-) Andreas ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
