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

Richard Elling richard.elling at richardelling.com
Sun Feb 4 14:35:37 EST 2018



> On Feb 4, 2018, at 11:32 AM, Andreas Dilger via zfs-discuss <zfs-discuss at list.zfsonlinux.org> wrote:
> 
> Actually, I just checked on Amazon, and the prices are $37 and $70 for the 16GB and 32GB parts respectively. 

PCIe to m.2 adapters run $15-$25
  -- richard

> 
> https://www.amazon.com/Intel-Optane-Memory-Module-MEMPEK1W032GAXT/dp/B06XSXX3NS
> 
> 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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