[Beowulf] SSD performance

[Jonathan Engwall]

Does 345 power_on_hours seem like "old age"
Not happy. Thanks for the CEPH tip.

On Sat, Jul 21, 2018, 11:30 PM Jonathan Engwall <
engwalljonathanthereal at gmail.com> wrote:

> I built up a couple r610 dells with the idea that they would boot from ssd
> through a usb external drive. The cheap external drives might be the real
> culprits. I have to think about that.
> The latest drive to fail was a Kingston and I think it was new.
> There is a write limit on some ssds?
> Lately I have been building trying to crosscompile the cray xmp simulator.
> It has thousands of targets. But earlier this week afterI installed
> openvswitch was when the trouble began.
> Jonathan Engwall
>
> On Sat, Jul 21, 2018, 10:44 PM John Hearns via Beowulf <
> beowulf at beowulf.org> wrote:
>
>> I forgot the main purpose of the Internet. My bad.
>> >You don't say for which purpose the SSDs are being used.
>> Storing cat pics?
>>
>> On 22 July 2018 at 07:41, John Hearns <hearnsj at googlemail.com> wrote:
>>
>>> You don't say for which purpose the SSDs are being used.
>>> In your laptop?
>>> As system disks in HPC compute nodes?
>>> Journalling drives in a parallel filesystem?
>>> Data storage drives in a parallel filesystem?
>>>
>>> Over on the CEPH mailing list there are regular topics on choice of
>>> SSDs. I would advise going over there and asking the same question.
>>>
>>> Also you don't say how they are failing.
>>> Are these consumer grade drives or data centre grade drives?
>>> Consumer drives have much, much lower 'drive writes per day'
>>>
>>> Two jobs ago I would have said the go-to data centre drives were Intel.
>>>
>>> Also one comment specific to HPC. I found that SSD drives dont 'get
>>> sick' like spinning drives,
>>> ie you dont see syslog messages about blocks failing to be read/written.
>>> They just fail.
>>> Also two jobs ago I though that SMART checks were not picking up failing
>>> SSDs.
>>> I believe that you can monitor them if you choose the correct counters.
>>> Anyone?
>>>
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>>> On 22 July 2018 at 07:32, Jonathan Aquilina <jaquilina at eagleeyet.net>
>>> wrote:
>>>
>>>> What Ones are you currently getting?
>>>>
>>>> Sent from my iPhone
>>>>
>>>> > On 22 Jul 2018, at 05:42, Jonathan Engwall <
>>>> engwalljonathanthereal at gmail.com> wrote:
>>>> >
>>>> > I am not happy with the SSDs I am using. I am buying another sad
>>>> every couple weeks.
>>>> > Fast sure, but my productivity right now is zero.
>>>> > Are there any recommendations on reliable ssd brands?
>>>> > Jonathan Engwall
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>>>
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