Package: mdadm
Version: 4.5-2
Severity: normal
I have a HP z840 server not configured for hardware RAID which has two SATA
SSDs that were previously used in a Dell system with PERC controller. The PERC
controller was configured for each device to be a single-device RAID-0 (to
make PERC with default firmware treat them as JBOD).
With mdadm 4.5-1 the PERC superblocks are recognised, configured as software
RAID, and work correctly. With 4.5-2 the system fails to find the root
filesystem and at the initramfs command line /proc/mdstat shows that no
software RAID devices are running.
root@usagi:/tmp# 6.17.13/sbin/mdadm --version
mdadm - v4.5 - 2025-12-16 - Debian 4.5-1
root@usagi:/tmp# 6.18.3/sbin/mdadm --version
mdadm - v4.5 - 2025-12-16 - Debian 4.5-2
root@usagi:/tmp# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid4] [raid5] [raid6] [raid10]
md125 : active raid0 sdb[0]
468320256 blocks super external:/md127/0 64k chunks
md126 : active raid0 sda[0]
468320256 blocks super external:/md127/3 64k chunks
md127 : inactive sdb[1](S) sda[0](S)
1062576 blocks super external:ddf
unused devices: <none>
-- Package-specific info:
--- mdadm.conf
CREATE owner=root group=disk mode=0660 auto=yes
HOMEHOST <system>
MAILADDR root
ARRAY /dev/md/0 metadata=1.2 UUID=5d63e73c:6c6845cf:9ed639c1:ba2f50af
name=othello2:0
--- /etc/default/mdadm
AUTOCHECK=true
AUTOSCAN=true
START_DAEMON=true
DAEMON_OPTIONS="--syslog"
VERBOSE=false
--- /proc/mdstat:
Personalities : [raid0] [raid1] [raid4] [raid5] [raid6] [raid10]
md125 : active raid0 sdb[0]
468320256 blocks super external:/md127/0 64k chunks
md126 : active raid0 sda[0]
468320256 blocks super external:/md127/3 64k chunks
md127 : inactive sdb[1](S) sda[0](S)
1062576 blocks super external:ddf
unused devices: <none>
--- /proc/partitions:
major minor #blocks name
259 0 500107608 nvme0n1
259 1 500106240 nvme0n1p1
259 2 976762584 nvme2n1
259 4 976760832 nvme2n1p1
259 3 976762584 nvme3n1
259 5 976760832 nvme3n1p1
259 6 1000204632 nvme1n1
259 7 1000203264 nvme1n1p1
8 0 468851544 sda
8 16 468851544 sdb
8 32 976762584 sdc
8 33 291840 sdc1
8 34 976468992 sdc2
9 126 468320256 md126
259 8 468319232 md126p1
9 125 468320256 md125
259 9 468318208 md125p1
252 0 4194304 zram0
7 0 67108864 loop0
--- LVM physical volumes:
LVM does not seem to be used.
--- mount output
tmpfs on / type tmpfs (rw,nosuid,nodev,relatime,seclabel,inode64)
tmpfs on /tmp type tmpfs
(rw,nosuid,nodev,seclabel,size=65952644k,nr_inodes=1048576,inode64)
/dev/md126p1 on /etc type btrfs
(ro,nosuid,nodev,noatime,seclabel,compress=zstd:15,ssd,discard=async,space_cache=v2,user_subvol_rm_allowed,skip_balance,subvolid=5,subvol=/)
tmpfs on /run/systemd/resolve type tmpfs
(rw,nosuid,nodev,noexec,relatime,seclabel,size=204800k,mode=755,inode64)
/dev/md126p1 on /usr type btrfs
(ro,nosuid,nodev,noatime,seclabel,compress=zstd:15,ssd,discard=async,space_cache=v2,user_subvol_rm_allowed,skip_balance,subvolid=5,subvol=/)
/dev/md126p1 on /var/lib/dpkg type btrfs
(ro,nosuid,nodev,noatime,seclabel,compress=zstd:15,ssd,discard=async,space_cache=v2,user_subvol_rm_allowed,skip_balance,subvolid=5,subvol=/)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
proc on /proc/sysrq-trigger type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/irq type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/bus type proc (ro,nosuid,nodev,noexec,relatime)
tmpfs on /dev type tmpfs (rw,nosuid,nodev,relatime,seclabel,mode=755,inode64)
udev on /dev/null type devtmpfs
(rw,nosuid,relatime,seclabel,size=65940516k,nr_inodes=16485129,mode=755,inode64)
udev on /dev/zero type devtmpfs
(rw,nosuid,relatime,seclabel,size=65940516k,nr_inodes=16485129,mode=755,inode64)
udev on /dev/full type devtmpfs
(rw,nosuid,relatime,seclabel,size=65940516k,nr_inodes=16485129,mode=755,inode64)
udev on /dev/random type devtmpfs
(rw,nosuid,relatime,seclabel,size=65940516k,nr_inodes=16485129,mode=755,inode64)
udev on /dev/urandom type devtmpfs
(rw,nosuid,relatime,seclabel,size=65940516k,nr_inodes=16485129,mode=755,inode64)
udev on /dev/tty type devtmpfs
(rw,nosuid,relatime,seclabel,size=65940516k,nr_inodes=16485129,mode=755,inode64)
devpts on /dev/pts type devpts
(rw,nosuid,noexec,relatime,seclabel,mode=620,ptmxmode=666)
devpts on /dev/console type devpts
(rw,nosuid,noexec,relatime,seclabel,gid=5,mode=600,ptmxmode=000)
--- initrd.img-6.17.13+deb14-amd64:
no initrd.img-6.17.13+deb14-amd64 found.
--- /proc/modules:
dm_mod 229376 0 - Live 0x0000000000000000
raid10 81920 0 - Live 0x0000000000000000
raid456 204800 0 - Live 0x0000000000000000
async_raid6_recov 20480 1 raid456, Live 0x0000000000000000
async_memcpy 16384 2 raid456,async_raid6_recov, Live 0x0000000000000000
async_pq 20480 2 raid456,async_raid6_recov, Live 0x0000000000000000
async_xor 16384 3 raid456,async_raid6_recov,async_pq, Live 0x0000000000000000
async_tx 16384 5 raid456,async_raid6_recov,async_memcpy,async_pq,async_xor,
Live 0x0000000000000000
raid6_pq 131072 4 btrfs,raid456,async_raid6_recov,async_pq, Live
0x0000000000000000
raid1 61440 0 - Live 0x0000000000000000
megaraid_sas 237568 0 - Live 0x0000000000000000
raid0 28672 2 - Live 0x0000000000000000
md_mod 233472 6 raid10,raid456,raid1,raid0, Live 0x0000000000000000
raid_class 12288 1 mpt3sas, Live 0x0000000000000000
scsi_mod 331776 9
uas,usb_storage,sg,megaraid_sas,sd_mod,mpt3sas,libata,raid_class,scsi_transport_sas,
Live 0x0000000000000000
--- volume detail:
/dev/[hsv]d[a-z]* not readable by user.
--- /proc/cmdline
initrd=\811577ce77f342f5a88aa4c74102602f\6.17.13+deb14-amd64\initrd.img-6.17.13+deb14-amd64
root=UUID=caf5f13b-c48f-4d01-aa30-93d29be10c03 ro init=/bin/systemd
consoleblank=0 rootflags=skip_balance,space_cache=v2 security=selinux nosmt
systemd.machine_id=811577ce77f342f5a88aa4c74102602f
--- udev:
ii udev 259-1 amd64 /dev/ and hotplug management daemon
9d7dfcdc58fa54941f8d28f6094a7a5b /lib/udev/rules.d/01-md-raid-creating.rules
b4418fc7d03427c5db367a7075b6aba3 /lib/udev/rules.d/63-md-raid-arrays.rules
9059567e6c218117d16fd1544029e4db /lib/udev/rules.d/64-md-raid-assembly.rules
9792d581f9b0995c7e7e64ad7cc29acd
/lib/udev/rules.d/69-md-clustered-confirm-device.rules
586124db77856a6d86e00eaa8b9eb94e /lib/udev/rules.d/99-systemd.rules
--- /dev:
Auto-generated on Sat, 24 Jan 2026 19:58:53 +1100 by mdadm bugscript
-- System Information:
Debian Release: forky/sid
Architecture: amd64 (x86_64)
Kernel: Linux 6.17.13+deb14-amd64 (SMP w/44 CPU threads; PREEMPT)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8),
LANGUAGE=en_AU:en
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect
Versions of packages mdadm depends on:
ii debconf [debconf-2.0] 1.5.91
ii libc6 2.42-9
ii libudev1 259-1
ii udev 259-1
Versions of packages mdadm recommends:
ii kmod 34.2-2+b1
Versions of packages mdadm suggests:
ii postfix [mail-transport-agent] 3.10.6-1
-- debconf-show failed
