6 ms·
OK, but the probability of data loss is still worse than with a cache, because failure of (HDD or SSD) is likelier than failure of HDD alone.
by gmac 14y ago
OK, but the probability of data loss is still worse than with a cache, because failure of (HDD or SSD) is likelier than failure of HDD alone.
- simonh 14y agoBut a HDD with a flash cache is still a hdd component and a flash component. Putting them in the same enclosure and using one of them as a cache for the other doesn't magically merge their combined MTBFs into a lower number.
- mistercow 14y agoThat is correct. While gmac is technically correct that you have a higher expected amount of data lost with the non-caching system than you would with the caching system, but that's just the trivial fact that more space = higher loss expectation.