[Beowulf] SSD performance

[John Hearns]

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?
>>>>
>>>>
>>>>
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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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