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 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 > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos