July 11, 2025Jul 11 Hi!I`am completely new to Unraid and have only used Synology NAS previously with RAID configuration. I have built my NAS from scratch (See build: Build).I have 3x hdd: Western Digital Red Plus 4 TB 3.5" 5400 RPM. My plan was to have them in RAID5 but after installing Unraid I began to realize it is not possible to do that haha..I have tried to configure an array (3 slots) but I can only use 1 hdd as disk and 2 hdd needs to be parity devices? Is it not possible to have 2 disks and 1 parity? It is worth mentioning I will use a Crucial P3 Plus 1 TB M.2-2280 as pool device. Sorry if this is a rookie question, I`am completely new to Unraid. 🙏
July 11, 2025Jul 11 Community Expert Well you have two choices.Run a RAIDZ1 pool (no array)Or install them in the unraid array with 1 being dedicated to the parity slot.Both are effectively RAID5 but different formsRAIDZ1 stripes data like a typical RAID with a single disk fault tolerance.Unraid Array does not stripe data with a single disk fault tolerance.In either case you will have 8TB usable disk space Edited July 11, 2025Jul 11 by MowMdown
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