[gpfsug-discuss] *New* IBM Spectrum Protect Whitepaper "Petascale Data Protection" (Dominic Mueller-Wicke)

[Lukas Hejtmanek]

On Wed, Aug 31, 2016 at 07:52:38AM +0200, Dominic Mueller-Wicke01 wrote:
> Thanks for reading the paper. I agree that the restore of a large number of
> files is a challenge today. The restore is the focus area for future
> enhancements for the integration between IBM Spectrum Scale and IBM
> Spectrum Protect. If something will be available that helps to improve the
> restore capabilities the paper will be updated with this information.

I guess that one of the reasons that restore is slow is because this:
(strace dsmc)
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum/home/jfeit/atlases/atlases/stud/atl_en/_referencenotitsig",
F_OK) = -1 ENOENT (No such file or directory)
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum/home/jfeit/atlases/atlases/stud/atl_en",
F_OK) = -1 ENOENT (No such file or directory)
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum/home/jfeit/atlases/atlases/stud",
F_OK) = -1 ENOENT (No such file or directory)
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum/home/jfeit/atlases/atlases",
F_OK) = -1 ENOENT (No such file or directory)
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum/home/jfeit/atlases",
F_OK) = -1 ENOENT (No such file or directory)
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum/home/jfeit",
F_OK) = -1 ENOENT (No such file or directory)
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum/home",
F_OK) = 0
[pid  9022] access("/exports/tape_tape/admin/restored/disk_error/1/VO_metacentrum", F_OK)
= 0

it seems that dsmc tests access again and again up to root for each item in
the file list if I set different location where to place the restored files.

-- 
Lukáš Hejtmánek