Richard Elling wrote:
On Jul 21, 2009, at 12:49 PM, Bob Friesenhahn wrote:
On Tue, 21 Jul 2009, Andrew Gabriel wrote:
The X25-M drives referred to are Intel's Mainstream drives, using MLC
flash.
The Enterprise grade drives are X25-E, which currently use SLC flash
(less dense, more reliable, much longer lasting/more writes). The
expected lifetime is similar to an Enterprise grade hard drive.
Yes, but they store hardly any data. The X25-M sizes they mention are
getting to the point that you could use them for a data drive.
With wear leveling and zfs you would probably discover that the drive
suddenly starts to wear out all at once once it reaches the end of its
lifetime. Unless drive ages are carefully staggered, or different
types of drives are intentionally used, it might be that data
redundancy does not help. Poof!
Eh? Would you care to share how you calculate this?
Well I'm assuming something like this:
If all your drives have *exactly* the same lifetime, you really don't
want them all to fail at the same time...so you should ideally arrange
that they fail a month or so apart. That should leave you plenty of time
to replace the failed device without all your data going bye bye at the
same time.
Or maybe that wasn't the part you wanted clarified. My bad :)
Matt
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