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> The only filesystem that was completely unaffected by any power failure was UFS, on FreeBSD (obviously with "soft updates" enabled). And with "completely una
by guenthert 2mo ago
> The only filesystem that was completely unaffected by any power failure was UFS, on FreeBSD (obviously with "soft updates" enabled).
And with "completely unaffected" you mean the internal (meta-data) consistency was maintained, recent user data changes were silently lost however.
- adrian_b 2mo agoNo filesystem, regardless of what kind of journaling is used, can guarantee anything else except that after a power failure you will get the same filesystem as it was a few minutes before the power failure. If there was anything written to the HDD/SSD during those minutes, it would be lost. For better guarantees than this you need special hardware, e.g. SSDs with big capacitors that can maintain the local power supply for a fraction of a second, during which the SSD controller can flush to non-volatile storage all buffered data.