From mboxrd@z Thu Jan 1 00:00:00 1970 From: Duane Subject: RAID5 devices assemble into RAID0 array Date: Sat, 25 Nov 2017 18:50:54 -0700 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------5174FD866447625F9A17D60E" Return-path: Content-Language: en-CA Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids This is a multi-part message in MIME format. --------------5174FD866447625F9A17D60E Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit I have 3 RAID5 devices. When I assemble them, I end up with a RAID0 device. What is the cause? What is the solution? All I can think of is the fact that there is only 1 active device. I had 2 but then manually failed it. I want to reassemble a RAID5 array and then re-add the second device. mdadm -E /dev/sdc2 /dev/sdd /dev/sde /dev/sdc2:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8            Name : dave:0  (local to host dave)   Creation Time : Fri Oct  6 10:46:50 2017      Raid Level : raid5    Raid Devices : 3  Avail Dev Size : 7813726208 (3725.88 GiB 4000.63 GB)      Array Size : 7630592 (7.28 GiB 7.81 GB)   Used Dev Size : 7630592 (3.64 GiB 3.91 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262064 sectors, after=7806142351 sectors           State : clean     Device UUID : 0fe7e674:e1149499:7acb8853:c71fed62 Internal Bitmap : 8 sectors from superblock     Update Time : Sun Nov 19 13:53:23 2017   Bad Block Log : 512 entries available at offset 24 sectors        Checksum : 79ee1226 - correct          Events : 51526          Layout : left-symmetric      Chunk Size : 64K    Device Role : Active device 0    Array State : A.. ('A' == active, '.' == missing, 'R' == replacing) /dev/sdd:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8            Name : dave:0  (local to host dave)   Creation Time : Fri Oct  6 10:46:50 2017      Raid Level : raid5    Raid Devices : 3  Avail Dev Size : 7813709489 (3725.87 GiB 4000.62 GB)      Array Size : 7630592 (7.28 GiB 7.81 GB)   Used Dev Size : 7630592 (3.64 GiB 3.91 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262064 sectors, after=7806078897 sectors           State : clean     Device UUID : ce2c8c03:f47f505b:c9a34e9a:668b70f5 Internal Bitmap : 8 sectors from superblock     Update Time : Sun Nov 19 13:53:23 2017   Bad Block Log : 512 entries available at offset 16 sectors        Checksum : a398c591 - correct          Events : 51526          Layout : left-symmetric      Chunk Size : 64K    Device Role : spare    Array State : A.. ('A' == active, '.' == missing, 'R' == replacing) /dev/sde:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8            Name : dave:0  (local to host dave)   Creation Time : Fri Oct  6 10:46:50 2017      Raid Level : raid5    Raid Devices : 3  Avail Dev Size : 7813709489 (3725.87 GiB 4000.62 GB)      Array Size : 7630592 (7.28 GiB 7.81 GB)   Used Dev Size : 7630592 (3.64 GiB 3.91 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262064 sectors, after=7806078897 sectors           State : clean     Device UUID : aecb9ce3:e7bc161f:9b8d1764:db815dde Internal Bitmap : 8 sectors from superblock     Update Time : Sun Nov 19 13:53:23 2017   Bad Block Log : 512 entries available at offset 16 sectors        Checksum : fa2581ac - correct          Events : 51526          Layout : left-symmetric      Chunk Size : 64K    Device Role : spare    Array State : A.. ('A' == active, '.' == missing, 'R' == replacing) mdadm -D /dev/md0 /dev/md0:         Version : 1.2      Raid Level : raid0   Total Devices : 3     Persistence : Superblock is persistent           State : inactive            Name : dave:0  (local to host dave)            UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8          Events : 51526     Number   Major   Minor   RaidDevice        -       8       64        -        /dev/sde        -       8       34        -        /dev/sdc2        -       8       48        -        /dev/sdd --------------5174FD866447625F9A17D60E Content-Type: text/x-vcard; name="duane.vcf" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="duane.vcf" bnVsbA== --------------5174FD866447625F9A17D60E--