Hi Kevin, [email protected] wrote on 07/06/2018 21:36:59:
> From: "Buterbaugh, Kevin L" <[email protected]> > So our restore software lays down the metadata first, then the data. > While it has no specific knowledge of the extended attributes, it > does back them up and restore them. So the only explanation that > makes sense to me is that since the inode for the file says that the > file should be in the gpfs23capacity pool, the data gets written there. Hm, fair enough. So it seems to extract and revise information from the inodes of backed-up files (since it cannot reuse the inode number, it must do so ...). Then, you could ask your SW vendor to include a functionality like "restore using GPFS placement" (ignoring pool info from inode), "restore data to pool XY" (all data restored,, but all to pool XY) or "restore only data from pool XY" (only data originally backed up from XY, and restored to XY), and LBNL "restore only data from pool XY to pool ZZ". The tapes could still do streaming reads, but all files not matching the condition would be ignored. Is a bit more sophisticated than just copying the inode content except some fields such as inode number. OTOH, how often are restores really needed ... so it might be over the top ... > > We?ve also determined that it is actually quicker to tell > our tape system to restore all files from a fileset than to take the > time to tell it to selectively restore only certain files ? and the > same amount of tape would have to be read in either case. Given that you know where the restored files are going to in the file system, you can also craft a policy that deletes all files which are in pool Capacity and have a path into the restore area. Running that every hour should keep your capacity pool from filling up. Just the tapes need to read more, but because they do it in streaming mode, it is probably not more expensive than shoe-shining. And that could also be applied to the third data pool which also retrieves files. But maybe your script is also sufficient Mit freundlichen Grüßen / Kind regards Dr. Uwe Falke IT Specialist High Performance Computing Services / Integrated Technology Services / Data Center Services ------------------------------------------------------------------------------------------------------------------------------------------- IBM Deutschland Rathausstr. 7 09111 Chemnitz Phone: +49 371 6978 2165 Mobile: +49 175 575 2877 E-Mail: [email protected] ------------------------------------------------------------------------------------------------------------------------------------------- IBM Deutschland Business & Technology Services GmbH / Geschäftsführung: Thomas Wolter, Sven Schooß Sitz der Gesellschaft: Ehningen / Registergericht: Amtsgericht Stuttgart, HRB 17122 _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
