Hi, On 5/30/2007 11:04 PM, [EMAIL PROTECTED] wrote: > Hello Arno, > >>>> I was poking around the manual and it looks like VolWrite is > incremented >>>> each time the maximum file size is reached. From the manual it says > that >>>> the default is 1GB, although I did see a message that stated the > default >>>> was 2GB. It appears that all of my volumes have volwrites > > 3999999. I >>>> have one tape that has over 30,000,000 VolWrites. >>> I believe it is 1GB -- not sure where you found the other thing. >>> >>>> What should sensible values be for VolWrites and VolMounts be for > LTO-2 >>>> tapes? >>> Don't know... you'd have to check your media for information on > that, or >>> perhaps someplace online that has recommendations for this. These > values >>> are fairly easily changed. I, for example, changed that query to > exclude >>> disk volumes, as it's pointless to be checking for volumes that do > not >>> wear out. >> Difficult... depending on the customers needs, I have used values for >> VolMounts between 10 and 2000 :-) >> VolWrites is more or less easily calculated: Say, we increment > VolWrites >> once per GB. LTO tapes might have a typical compressed capacity of 280 >> GB. That makes 280 VolWrites for a full tape, 20 full writes seeam >> reasonable for the customers needs, so I'd use 5600 as the limit here. > > 16: List Volumes likely to need replacement from age or errors > Choose a query (1-16): 16 > +-----------------+--------+--------+------------+--------+ > | Volume | Mounts | Errors | Writes | Status | > +-----------------+--------+--------+------------+--------+ > | Weekly02-Vol003 | 22 | 0 | 30,412,916 | Full | > | Weekly02-Vol002 | 23 | 0 | 28,649,104 | Used | > | Weekly02-Vol004 | 24 | 0 | 28,657,428 | Used | > +-----------------+--------+--------+------------+--------+ > * > > Something doesn't look right here. It looks like I have on average 1.38 > MILLION writes per mount. The Weekly02 tapes are used once a week, on > Sunday for Weekly differential backups and on the first Sunday of the > month for a Full backup. What is causing the disparity between the > number of mounts and volume writes?
Well, that fits to what I believe - the VolWrites does not count the file marks, but the blocks written. I didn't want to argue with the manual in my previous mail :-) A block, by default, is 64512 Bytes IIRC, or let's say about 63k. Some calculation: 63*30000000/1024/1024 1802 So, your 30000000 writes would represent about 1.8 TBytes written to a tape. For LTO2, assuming 300GB per full tape, that would indicate the tape was completely filled about six times. Does that sound reasonable? At least it more or less fits to the number of mounts, I think. > I am really asking where should I look to see what is causing the huge > number of VolWrites? I have checked my config files and I don't set > maximum file size anywhere. Probably in the source code :-) I have never looked that up myself. Arno >>>> How can I check to see what the default value is for VolWrites? >>> What do you mean? The default "too many" value? All of this is in >>> query.sql which is somewhere in the Bacula tree (should be pretty > easy >>> to dig up). > > I was asking where to find the default value for Maximum File Size, > which I found in src/stored/stored_conf.c. maximumfilesize is set to > 1000000000 which appears to be exactly what the manual states. > > Thank you, > > Tom. > ---- > Thomas Boyda > Consultant, Proxicom, Inc. > 276-739-2314 (Desk) > > ------------------------------------------------------------------------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > Bacula-users mailing list > Bacula-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bacula-users -- IT-Service Lehmann [EMAIL PROTECTED] Arno Lehmann http://www.its-lehmann.de ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
