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sbh2019-05-16 03:51:05
RAID
sbh, 2019-05-16 03:51:05

Does RAID1 from SSD make sense for fault tolerance?

How rational is it to create RAID1 from SSD disks for fault tolerance?
Does it make sense? If there is, then which one?
In terms of fault tolerance, SSD drives are much higher than HDDs. Plus, in the mirror, they will wear out in the same way and fail at the same time. There remains a failure of the SSD due to a power surge - this can be compensated by putting a good network filter \ UPS at the input. What else is left? Well, some probability of disk control board failure. But what is the probability of this?
PS
Reliability of SSD: statistics from Google

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2 answer(s)
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Viktor, 2019-05-16
@sbh

In terms of fault tolerance, SSD drives are much higher than HDDs.

Unsubstantiated statement.
If we are talking about wear and tear, then, as far as I know, memory cells will wear out and become read-only.
There will be no loss of information.
Nobody will tell you this.
There is a possibility.
And drives and SSDs can die suddenly even new ones.
What do you want to protect yourself from?
If it's a normal drive on a normal computer (system+private/data), I think it's wiser to protect yourself with a backup.
If you need high availability and 24/7 operation of equipment (server, storage, etc.), it is reasonable to use a raid from SSDs or disks.

A
Artem @Jump, 2019-05-16
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Does RAID1 from SSD make sense for fault tolerance?
For fault tolerance, there is a sense.
If you need uninterrupted operation so that in the event of a disk failure, work is not interrupted and the server does not reboot, you need RAID1.
In terms of fault tolerance, SSD drives are much higher than HDDs.
Why? It seems to be the same.
Plus, in the mirror, they will wear out in the same way and fail at the same time.
The assertion is incorrect. In the mirror, they will wear out in different ways, and will fail at different times.
There remains a failure of the SSD due to a power surge - this can be compensated by putting a good network filter \ UPS at the input.
Yes, SSDs do not like power surges, and can potentially fail in the event of a sudden power outage. Although this happens very rarely.
The most common cause of SSD failure is software freezing, problems with the controller. This is mainly why they fail.

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