[Beowulf] SSD performance

[Jonathan Aquilina]

Also another thing I think worth asking is if these ssd‘s are standard Sata drives or m.2 drives

Sent from my iPhone

> On 22 Jul 2018, at 08:02, Jonathan Engwall <engwalljonathanthereal at gmail.com> wrote:
> 
> 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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