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Forum Discussion
Reallocated Sector Count - Best Practices
I've got a set of 6 Seagate ST3500514NS 500GB - each drive seems to pick up an additional reallocated sector every week or two. Some of them are up to around ~30 reallocated sectors at this point. ...
@ 30 I think they would always replace them. 2 seems a good number, and > 20 you are a lot more likely to be doomed soon. It ain't going to go down ;-) You can see http://research.google.com/archive/disk_failures.pdf for some good info and statistics.
Bottom line: the "size" of the sector is so infinitesimally small that any "error condition" is likely to affect more than just 1 sector. I don't think the firmware thinks about this, so if I were you I'd cron a scrub every month and definitely scrub if the realloc count goes up. That will check the whole arrray and fix/realloc any further read errofs. In theory, it should find any other realloc errors that are just lurking waiting to be found.
IMHO.
Bottom line: the "size" of the sector is so infinitesimally small that any "error condition" is likely to affect more than just 1 sector. I don't think the firmware thinks about this, so if I were you I'd cron a scrub every month and definitely scrub if the realloc count goes up. That will check the whole arrray and fix/realloc any further read errofs. In theory, it should find any other realloc errors that are just lurking waiting to be found.
IMHO.
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