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"Phil" == Phil Turmel [off-list ref] writes:

Phil> On 11/16/2015 11:28 AM, John Stoffel wrote:

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Guys,

I'm starting to get tons of errors on my various mixed 1 and 2Tb
drives I have in a bunch of RAID 1 mirrors, generally triple mirrors.
It's time to start replacing them and I think I want to either go with
the WD Black 4Tb or the WD Red 4Tb drives.  And with a pair of 500Gb
SSDs to use with lvmcache for speedup.

Any comments?

Phil> The data sheet for the Blacks implies that they do *not* have
Phil> TLER, also known as ERC.  This is vital for proper operation
Phil> out-of-the-box in any Linux Raid environment, with the exception
Phil> of raid0.

So I like the 5 year warranttee on the blacks, but it does look like
the REDs are the way to go.  And I think I'll also go with splitting
my data between seagate and WD and possibly Hitachi (I know, they've
been bought by WD) to make a three way RAID 1 mirror across 4Tb
drives.  Yes, I'd get more room out of RAID5, but I'm not that silly,
and I don't need to move to 4 x 4Tb in RAID6 either.

Who knows... still pricing things out.

John