From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Pilcher Subject: RAID types & chunks sizes for new NAS drives Date: Sun, 21 Jun 2020 11:23:35 -0500 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Return-path: Content-Language: en-US Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids I'm replacing the drives in my 5-bay NAS, and planning how I'm going to divide them up. My general plan is to create a matching set of partitions on the drives, and then create RAID devices across the sets of partitions, for example: md1: /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 md2: /dev/sdb2 /dev/sdc2 /dev/sdd2 /dev/sde2 /dev/sdf2 ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ md16: /dev/sdb16 /dev/sdc16 /dev/sdd16 /dev/sde16 /dev/sdf16 This will give me the flexibility to create RAID devices of different types, as well as maybe(?) reducing the "blast radius" if a particular portion of a disk goes bad. I believe that it makes sense to use at least 2 different RAID levels - RAID-10 for "general" use and RAID-6 for media content. Does this make sense? If so, does anyone have any thoughts or pointers on the chunk size, particularly for RAID-10? (I assume that RAID-6 will have similar considerations to RAID-5, and so a large chunk size would make sense, particularly for large media files.) Any other thoughts? Thanks! -- ======================================================================== In Soviet Russia, Google searches you! ========================================================================