[Beowulf] SSD performance

[Jonathan Engwall]

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?
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> 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
>>> > _______________________________________________
>>> > Beowulf mailing list, Beowulf at beowulf.org sponsored by Penguin
>>> Computing
>>> > To change your subscription (digest mode or unsubscribe) visit
>>> http://www.beowulf.org/mailman/listinfo/beowulf
>>>
>>> _______________________________________________
>>> Beowulf mailing list, Beowulf at beowulf.org sponsored by Penguin Computing
>>> To change your subscription (digest mode or unsubscribe) visit
>>> http://www.beowulf.org/mailman/listinfo/beowulf
>>>
>>
>>
> _______________________________________________
> Beowulf mailing list, Beowulf at beowulf.org sponsored by Penguin Computing
> To change your subscription (digest mode or unsubscribe) visit
> http://www.beowulf.org/mailman/listinfo/beowulf
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.beowulf.org/pipermail/beowulf/attachments/20180721/04add300/attachment-0001.html>