From mboxrd@z Thu Jan 1 00:00:00 1970 From: dfc Subject: USB chasis fails, fate of the software raid? Date: Wed, 18 Oct 2017 15:04:41 -0400 Message-ID: <1508353481.2692.9.camel@astro.cornell.edu> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids I have an Orico (3559SUSJ3) external 5 bay hard disk drive enclosure attached via USB to my desktop computer. It holds 5 * 4 TB disks in raid5 and has functioned for a couple of years. Then the power supply (or fan or some internal component of the chasis) failed and -- from one boot to the next -- the chasis is DOA, i.e. it does not even power on the disks.  When last used, the drives were all active and  in good shape; I copy below the output of the mdadm --detail list just a short time before the failure. My main question is whether inserting the 5 disks into another JBOD chasis is likely to work? In particular is mdadm "smart enough" to find all the components and/or do I need to do something to help it along? In fact, our IT person has suggested that the data may well be lost. Details:  raid5 (no spares) 20 TB XFS filesystem Debian 3.16.0-4-amd64 Also, since I first used the JBOD with software raid I came to realize that the usb connection is not a good choice (though I have never had problems). What sort of connection (at the low price end of the market for HDD enclosures) would be better? eSata or something else? Many thanks for answers/suggestions. David ----------------------------------------------------------- OUTPUT of mdadm --detail list /dev/sdd1:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : 954b2546:5c467e9c:a4eb74e3:27dad837            Name : impala:0   Creation Time : Fri May 22 15:32:31 2015      Raid Level : raid5    Raid Devices : 5  Avail Dev Size : 7813771264 (3725.90 GiB 4000.65 GB)      Array Size : 15627542528 (14903.59 GiB 16002.60 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262056 sectors, after=0 sectors           State : clean     Device UUID : f0cda836:8c1c28d1:53710d20:db8d088a Internal Bitmap : 8 sectors from superblock     Update Time : Sat Sep  2 18:54:20 2017   Bad Block Log : 512 entries available at offset 72 sectors        Checksum : 3d0d8085 - correct          Events : 197036          Layout : left-symmetric      Chunk Size : 512K    Device Role : Active device 4    Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing) /dev/sde1:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : 954b2546:5c467e9c:a4eb74e3:27dad837            Name : impala:0   Creation Time : Fri May 22 15:32:31 2015      Raid Level : raid5    Raid Devices : 5  Avail Dev Size : 7813771264 (3725.90 GiB 4000.65 GB)      Array Size : 15627542528 (14903.59 GiB 16002.60 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262056 sectors, after=0 sectors           State : clean     Device UUID : 2e1a57ff:f892fb23:1f698390:53dd98e3 Internal Bitmap : 8 sectors from superblock     Update Time : Sat Sep  2 18:54:20 2017   Bad Block Log : 512 entries available at offset 72 sectors        Checksum : 22958a72 - correct          Events : 197036          Layout : left-symmetric      Chunk Size : 512K    Device Role : Active device 3    Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdf1:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : 954b2546:5c467e9c:a4eb74e3:27dad837            Name : impala:0   Creation Time : Fri May 22 15:32:31 2015      Raid Level : raid5    Raid Devices : 5  Avail Dev Size : 7813771264 (3725.90 GiB 4000.65 GB)      Array Size : 15627542528 (14903.59 GiB 16002.60 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262056 sectors, after=0 sectors           State : clean     Device UUID : 3be7bbb4:4e5f07e3:f78f3c31:5bd6df6b Internal Bitmap : 8 sectors from superblock     Update Time : Sat Sep  2 18:54:20 2017   Bad Block Log : 512 entries available at offset 72 sectors        Checksum : c00643b3 - correct          Events : 197036          Layout : left-symmetric      Chunk Size : 512K    Device Role : Active device 2    Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdg1:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : 954b2546:5c467e9c:a4eb74e3:27dad837            Name : impala:0   Creation Time : Fri May 22 15:32:31 2015      Raid Level : raid5    Raid Devices : 5  Avail Dev Size : 7813771264 (3725.90 GiB 4000.65 GB)      Array Size : 15627542528 (14903.59 GiB 16002.60 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262056 sectors, after=0 sectors           State : clean     Device UUID : 2b09eed0:0a6ead54:48671d28:0abd1b6e Internal Bitmap : 8 sectors from superblock     Update Time : Sat Sep  2 18:54:20 2017   Bad Block Log : 512 entries available at offset 72 sectors        Checksum : 46fb325e - correct          Events : 197036          Layout : left-symmetric      Chunk Size : 512K    Device Role : Active device 1    Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdh1:           Magic : a92b4efc         Version : 1.2     Feature Map : 0x1      Array UUID : 954b2546:5c467e9c:a4eb74e3:27dad837            Name : impala:0   Creation Time : Fri May 22 15:32:31 2015      Raid Level : raid5    Raid Devices : 5  Avail Dev Size : 7813771264 (3725.90 GiB 4000.65 GB)      Array Size : 15627542528 (14903.59 GiB 16002.60 GB)     Data Offset : 262144 sectors    Super Offset : 8 sectors    Unused Space : before=262056 sectors, after=0 sectors           State : clean     Device UUID : 324b49de:233d8769:7f75afad:dddb0ec8 Internal Bitmap : 8 sectors from superblock     Update Time : Sat Sep  2 18:54:20 2017   Bad Block Log : 512 entries available at offset 72 sectors        Checksum : 48b57088 - correct          Events : 197036          Layout : left-symmetric      Chunk Size : 512K    Device Role : Active device 0    Array State : AAAAA ('A' == active, '.' == missing, 'R' == replacing)