Hi Michael,
RAID 1 is not uncommon with SSDs (be them SATA/SAS/NVMe).
RAID 5/6 wear SSD drives more so are generally best avoided.
You really need to monitor your SSDs health to help avoid failures.
And obviously always have your backups...
-yoctozepto
On Wed, Sep 16, 2020 at 6:12 PM Michael Schumacher
<michael.schumacher@xxxxxxxx> wrote:
>
> hi,
>
> I am planning to replace my old CentOS 6 mail server soon. Most details
> are quite obvious and do not need to be changed, but the old system
> was running on spinning discs and this is certainly not the best
> option for todays mail servers.
>
> With spinning discs, HW-RAID6 was the way to go to increase reliability
> and speed.
> Today, I get the feeling, that traditional RAID is not the best
> option for SSDs. I am reading that all RAID members in SSD-arrays age
> synchronously so that the risk of a massive failure of more than one
> disk is more likely than with HDDs. There are many other concerns like
> excessive write load compared to non-raid systems, etc.
>
> Is there any common sense what disk layout should be used these days?
>
> I have been looking for some kind of master-slave system, where the
> (one or many) SSD is taking all writes and reads, but the slave HDD
> runs in parallel as a backup system like in a RAID1 system. Is there
> any such system?
>
> Any thoughts?
>
> best regards
> Michael Schumacher
>
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