Version 2 by Nata Ramanenka
on Apr 21, 2010 00:43.
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Version 3 by David Young
on Apr 25, 2010 03:35.
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The CDP 3 Disk Safe can actually *read the files much faster than CDP 2.x.* See also: [kb:Files Restore Speed], [kb:Files Restore Is Very Slow].

CDP 3 crawls all the files you want to restore before it restores to total the file sizes before it restores, giving you an accurate progress bar. Opening 10 million files (Inodes) to get their file size takes 7 minutes.

When CDP system reads files in the Disk Safe, the operating system is not involved. CDP just fetches 32 KB Disk Safe pages from a file on Disk.
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Compare: When we restore one 10 GB file on the same servers, we call Open(O_CREATE) once and then write 10 GB of data. In this case, the "penalty" for creating a large file is negligible.
{info:title=Note}The performance measurements were done at completed on two high performance servers with simple direct attached SCSI disks on a Gigabit Ethernet Switch.
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