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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.
What is "normal" growth you have seen for reallocated sectors?
What is the best practice for replacing drives due to reallocated sector count? At what number of reallocated sectors should I start worrying?
Interesting side note - in the same ReadyNAS, I have 6 WDC WD1002FBYS-02A6B0 1TB drives. These drives have yet to pick up a single reallocated sector, and have been running for the same time, and under the same load as the Seagate drives. Difference in quality maybe?
What is "normal" growth you have seen for reallocated sectors?
What is the best practice for replacing drives due to reallocated sector count? At what number of reallocated sectors should I start worrying?
Interesting side note - in the same ReadyNAS, I have 6 WDC WD1002FBYS-02A6B0 1TB drives. These drives have yet to pick up a single reallocated sector, and have been running for the same time, and under the same load as the Seagate drives. Difference in quality maybe?
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- @ 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.
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