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by aduitsis
4494 days ago
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If I'm not mistaken, the first number (1) is not considered a power of three, hence the initial (seemingly strange) three=1. See http://www.nongnu.org/ext2-doc/ext2.pdf#page15 for a slightly more detailed explanation. "The first version of ext2 (revision 0) stores a copy at the start of every block group, along with backups of the group descriptor block(s). Because this can consume a considerable amount of space for large filesystems, later revisions can optionally reduce the number of backup copies by only putting backups in specific groups (this is the sparse superblock feature). The groups chosen are 0, 1 and powers of 3, 5 and
7." (Edit: Yes, I know that 3^0=1, but the wording "0, 1 and powers of 3, 5" does not imply 3^0. Thanks!) |
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