Hello, On 7/4/21 13:31, War Nings wrote: > Hello, > > I'm new to LTO backup and Bacula usage so may be not enough knowledge. > > My LTO7 or even LTO3 media not run smooth during backup. Not know if > it's shoe shining effect but seem something like that. > You can hear it media stop and restart each some seconds or view on > file/network monitoring than bandwidth stop and restart some seconds > later. > I try to remove MD5 checksum but seem change nothing always the same > issue with signature None or MD5. Spool parameter seem to change > nothing too with 50go or 900go spool size is the same issue. > > I try directly from a network share with enough bandwidth after I try > to use a SSD spool 1tb with ~400mo/sec read capabilities when I copy > file to the memory or on /dev/null so can sustain without issue a LTO7 > drive. The bandwidth speed reach something like ~200mo/sec drop and > return to ~200mo/sec. > > If I use tar cvf command to copy the same folder directly to lto drive > seem run smooth without any interrupt. Bandwidth is stable at > ~118mo/sec seem low for a LTO7 media but not have any stop and > restart. It's the same with LTO3 media with less bandwidth usage. > > What can be the issue if it's not normal with Bacula ? > Database too slow to write entries but stored on a old SSD so not a > lot of bandwidth but 50mo/sec without issue for record md5 checksum > should be enough. > CPU who calculate checksum files too slow Bacula wait on CPU and > restart with next file ? > One missed parameter for keep some gb in a memory buffer ? > I check PCIe bandwidth with 5Gb/s at 8x. > > > I not want to destroy my LTO drive or media due to all of these stops > each some seconds. >
I would recommend to run the btape utility to find the best parameters for your drive. In addition, make sure that: - you use a recent version of Bacula - the Batch Mode is enabled (by default) - Spooling of the attributes is enabled (by default) - the Storage/Device/Maximum File Size parameter is set to 5-15G (default to 1G) Each time the Maximum File Size parameter is reached, Bacula will put a mark on the tape and produces a JobMedia that may need to be inserted in the catalog before to continue the backup (it depends on the version you use). Hope it helps! Best Regards, Eric _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
