[OpenIndiana-discuss] [zfs-discuss] Question about WD drives with Super Micro systems

[Roy Sigurd Karlsbakk]

> Might this be the SATA drives taking too long to reallocate bad
> sectors? This is a common problem "desktop" drives have, they will
> stop and basically focus on reallocating the bad sector as long as it
> takes, which causes the raid setup to time out the operation and flag
> the drive as failed. The "enterprise" sata drives, typically the same
> as the high performing desktop drive, only they have a short timeout
> on how long they are allowed to try and reallocate a bad sector so
> they don't hit the failed drive timeout. Some drive firmwares, such as
> older WD blacks if memory serves, had the ability to be forced to
> behave like the enterprise drive, but WD updated the firmware so this
> is longer possible.
> 
> This is why you see SATA drives that typically have almost identical
> specs, but one will be $69 and the other $139 - the former is a
> "desktop" model while the latter is an "enterprise" or "raid" specific
> model. I believe it's called different things by different brands:
> TLER, ERC, and CCTL (?).

I doubt this is about the lack of TLER et al. Some, or most, of the drives ditched by ZFS have shown to be quite good indeed. I guess this is a WD vs Intel SAS expanders issue

Vennlige hilsener / Best regards

roy
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Roy Sigurd Karlsbakk
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roy at karlsbakk.net
http://blogg.karlsbakk.net/
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