[Beowulf] SSD performance

[John Hearns]

Yes there ARE write limits to SSDs. Look at the 'drive writes per day'
figure.


On 22 July 2018 at 12:30, John Hearns <hearnsj at googlemail.com> wrote:

> Well if you are looking for boot drives.. I would seriously advice looking
> at SATA DOMs
> These are solid state drives which plug into the SATA socket on the
> motherboard.
> They are fantastic for storage servers - you can use all of the drive
> slots for storage or journaling drives.
>
> I would really like to build a cluster sometime with SATA DOM on the
> compute nodes too.
>
>
> On 22 July 2018 at 09:07, Jonathan Aquilina <jaquilina at eagleeyet.net>
> wrote:
>
>> 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?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> 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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>
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