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From: Evgeniy Shishkin <itparanoia@gmail.com>
To: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
Cc: pgsql-performance@lists.postgresql.org
Subject: Re: Latest advice on SSD?
Date: Fri, 11 May 2018 17:48:25 +0300
Message-ID: <9229B816-42C6-4AD0-B0E4-756C9894F52C@gmail.com> (raw)
In-Reply-To: <a7cf42e5-534a-ddfb-318c-cc8b39903b00@catalyst.net.nz>
References: <VisenaEmail.35.c5e104eae07d6442.1634ef0e2ea@tc7-visena>
	<a7cf42e5-534a-ddfb-318c-cc8b39903b00@catalyst.net.nz>



> On May 11, 2018, at 15:11, Mark Kirkwood <mark.kirkwood@catalyst.net.nz> wrote:
> 
> On 11/05/18 23:23, Andreas Joseph Krogh wrote:
> 
>> På onsdag 09. mai 2018 kl. 22:00:16, skrev Andreas Joseph Krogh <andreas@visena.com <mailto:andreas@visena.com>>:
>> 
>>    FWIW; We're testing
>>    this: https://www.supermicro.nl/products/system/1U/1029/SYS-1029U-TN10RT.cfm
>>    with 4 x Micron NVMe 9200 PRO NVMe 3.84TB U.2 in RAID-10:
>>    
> These Micron disks look interesting (pretty good IOPS and lifetime numbers). However (as usual with Micron, sadly) no data about power off safety. Do you know if the the circuit board has capacitors?

According to https://www.micron.com/~/media/documents/products/data-sheet/ssd/9200_u_2_pcie_ssd.pdf <https://www.micron.com/~/media/documents/products/data-sheet/ssd/9200_u_2_pcie_ssd.pdf;

The SSD supports an unexpected power loss with a power-backed write cache. No userdata is lost during an unexpected power loss. When power is subsequently restored, theSSD returns to a ready state within a maximum of 60 seconds.=

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