[CentOS] storage for mailserver

Wed Sep 16 16:47:05 UTC 2020
Radosław Piliszek <radoslaw.piliszek at gmail.com>

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...


On Wed, Sep 16, 2020 at 6:12 PM Michael Schumacher
<michael.schumacher at pamas.de> 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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