From: tnp@invalid.invalid
On 21/07/2024 21:28, druck wrote:
> On 21/07/2024 11:47, Ahem A Rivet's Shot wrote:
>> On Sun, 21 Jul 2024 10:44:03 +0100
>> The Natural Philosopher wrote:
>>
>>> Oh indeed. My new server will feature two SMART enabled SSDs...one a
>>> mirror of the other.
>>> I am not interested in RAID. RAID increases availability, but does not
>>> archive data
>>
>> You have a mirror - that's RAID. RAID is about smoothly surviving
>> drive failures. With any storage system there are two important factors -
>> mean time to data loss and probability of data unavailability.
>
> Ignoring whether its RAID or not, mirroring will protect you against a
> random failure of one of the drives, which was more useful in the
> spinning rust days when random mechanical failures were an issue.
>
I agree.
> With SSD, write life is the main issue, and if you have two identical
> mirrored drives, you may find any write life issues, which are not
> random, occur at exactly the same time.
>
But never at exactly the SAME time.
Remember the primary drive gets written to all day long as stuff like
this post is downmloaded, read and deleted.
The secondary gets a once a day rsync,
And, whilst I have never had an SSD wear out fromn writes in the past 8
years I have had one fail in a quite different way shortly after purchase.
> So with any type of mirrored arrangement, make sure they are different
> makes or models of drive, so it is less likely they fail together.
>
They are not subject to the same usage pattern, and they are not made
from the same components.
As long as they dont fail within 24 hours of each other
--
In a Time of Universal Deceit, Telling the Truth Is a Revolutionary Act.
- George Orwell
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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