[kwlug-disc] NVME failure?

[Charles M]

Ron are those just used in servers? That heat sink looks really thick,
wondering if it would be okay with a graphics card close to the slot?

On Sat, Jul 31, 2021, 5:37 PM Ron Singh, <ronsingh149 at gmail.com> wrote:

> We have been using the Sammy 970 Pro 1TB for caching in servers being
> beaten about 18hr/6dy and have never had any failures.
> I think we started on this model some 2yrs ago when they first came out,
> prior to that we used the 960 Pro units.
> All are NVMe.
>
> We *always* marry them to a decent heatsink. Heat kills, NVMe drives run
> hot when being beaten, heatsinks plus a chassis fan providing decent
> laminar airflow of the SSDs makes for greater reliability I think.
>
> Specs on SSD:
>
> https://www.samsung.com/ca/memory-storage/nvme-ssd/970-pro-nvme-m-2-ssd-1tb-mz-v7p1t0bw/
> Not sure how the newer 980 Pro stack up as we are not transitioning away
> from the 970 Pro unit mid-2022.
>
> Specs on Heatsink:
> https://www.sabrent.com/product/SB-HTSK/m-2-2280-ssd-rocket-heatsink/
>
> This really does not address your Q, but I thought I would toss out an
> anecdote out there.
> BTW, the nitty-gritty on the Micron 9300 Max can be found here:
>
> https://media-www.micron.com/-/media/client/global/documents/products/product-flyer/9300_ssd_product_brief.pdf
> Micron plays fast and loose about their TBW rating, sneaky buggers,
> "3-drive writes per day".
>
> Thanks,
>
> Ron S.
>
>
>
> On Sat, Jul 31, 2021 at 4:27 PM Khalid Baheyeldin <kb at 2bits.com> wrote:
>
>> Short version: what is the longevity of NVME disks under heavy writes,
>> e.g. for MySQL database?
>>
>> I am hoping that some hardware knowledgeable folk would clue me in on
>> this hardware related issue.
>>
>> Basically, I had a client who got a new server over a year ago. The
>> hosting company, a large US based host, recommended that we use an
>> NVME disk for MySQL. This is a plain old physical server running
>> Ubuntu Server 20.04 LTS (no VMs, no docker). It has 64GB RAM and 16
>> cores. The root file system is two SSDs that are software RAIDed
>> together. 1
>>
>> We had kernel patches accumulating over that year, and I wanted to do
>> a reboot to make sure that everything started normally. Upon rebooting
>>
>> [  128.001364] nvme nvme0: Device not ready; aborting initialisation
>> [  128.002041] nvme nvme0: Removing after probe failure status: -19
>>
>> That NVME was a 1.6TB Micron 9200 MAX, if that matters.
>>
>> There was no device file under /dev/ for that disk anymore.
>>
>> After the host replacing the NVME, everything was normal, as below:
>> [    7.558183] nvme nvme0: Shutdown timeout set to 10 seconds
>> [    7.562576] nvme nvme0: 32/0/0 default/read/poll queues
>> [    7.565741]  nvme0n1: p1
>> ...
>> Jul 31 15:27:54 live multipath: nvme0n1: failed to get udev uid:
>> Invalid argument
>> Jul 31 15:27:54 live multipath: nvme0n1: uid =
>> eui.000000000000000100a0750128df8715 (sysfs)
>> ...
>> [    6.008941] nvme nvme0: pci function 0000:b6:00.0
>>
>> [   11.571864] EXT4-fs (nvme0n1p1): mounted filesystem with ordered
>> data mode. Opts: (null)
>>
>> Now to the questions:
>>
>> - Why would a device be functional before a reboot but totally go away
>> after, and not being even detected by the operating system?
>> - Are NVME as unreliable as SSDs or better? Or are they just faster?
>>
>> All thoughts appreciated ...
>> --
>> Khalid M. Baheyeldin
>> 2bits.com, Inc.
>> Fast Reliable Drupal
>> Drupal performance optimization, hosting and consulting.
>> "Sooner or later, this combustible mixture of ignorance and power is
>> going to blow up in our faces." -- Dr. Carl Sagan
>>
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