On Tue, 21 Nov 2017 10:35:57 +1100 Nigel Williams wrote: > On 21 November 2017 at 10:07, Christian Balzer <chibi@xxxxxxx> wrote: > > On Tue, 21 Nov 2017 10:00:28 +1100 Nigel Williams wrote: > >> Is there something in the specifications that gives them away as SSHD? > >> > > The 550TB endurance per year for an 8TB drive and the claim of 30% faster > > IOPS would be a dead giveaway, one thinks. > > I just found this other answer: > > http://products.wdc.com/library/other/2579-772003.pdf > > Hard-drive manufacturers introduced workload specifications because > they better model failure rates than MTTF. > I've heard that before, alas if you exceed 550TB/year, do you void your warranty then? If so, another thing to keep in mind. > I see the drive has 2MB of NOR-flash for write-caching, what happens > when this wears out? > Should have been 30x up there of course. As for NOR, it is supposed to be very durable, but if it fails it definitely means dead drive and lost data, like with all caches really. Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Rakuten Communications _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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