[zfs-discuss] Optane devices, new Metadata Allocation Class feature

Andreas Dilger adilger at dilger.ca
Sun Feb 4 14:32:07 EST 2018

Actually, I just checked on Amazon, and the prices are $37 and $70 for the 16GB and 32GB parts respectively. 


Cheers, Andreas

> On Feb 4, 2018, at 11:30, Peter Ashford via zfs-discuss <zfs-discuss at list.zfsonlinux.org> wrote:
>> On 2018-02-04 10:35, Ted Cabeen wrote:
>>> On 2/4/2018 8:42 AM, Peter Ashford via zfs-discuss wrote:
>>>> On 2018-02-04 02:00, Durval Menezes via zfs-discuss wrote:
>>>> Hello Andreas, Hetz,
>>>> El 04-02-2018 03:57, "Andreas Dilger via zfs-discuss"
>>>> <zfs-discuss at list.zfsonlinux.org> escribió:
>>>>> These would be great ZIL devices, since they are the new 3DXPoint
>>>>> NVRAM (not 3DNAND) so have much higher write endurance and
>>>>> better/consistent IOPS because they don't need to be erased before
>>>>> overwrite like NAND flash.
>>>> Agreed, Optane would be perfect for dedicated ZIL.
>>> I don't believe that any system has two Optane slots, so this ZIL probably can't be mirrored for improved reliability.
>> Optane is available in a PCIe card format.  I have a system with dual
>> Optane cards (one per pool on a two-pool system), and it works great.
> While it is absolutely true that Optane is available in a standard PCI-E card (the smallest of which is 280GB for $400), the original reference (from Andreas Dilger) was to the M.2 format Optanes (16GB and 32GB for $60 and $120 respectively).  That's a HUGE difference, especially for someone who's trying to not waste space (presumably to save money).
> Apparently I trimmed a but too much from the post I quoted.  Sorry for the confusion.
> Peter Ashford
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