boot issue when mdadm resync

MSIUD

Hello,

i install centos with raid10 and install virtualizor on it with kvm,
the storage part,i use raw.

i try to create some vps and install windows server 2012/2016 and centos on them,
and i get an issue.

when the resync running for the mdadm raid,

1. if the vps and os had run begin the resync to begin,
   the os works normally.

2. but if i restart certain one windows and check on vnc,
   it will stop at the screen https://ibb.co/b2RBMR ,
   and something stay at https://ibb.co/ggfPQm ,
   and it can not boot well into os.

about the 2. issue,
i try to speed down the resync to 5-10mb/s,
it seems the os can boot into os,just slow.

but normally,the resync can run with 200-300mb/s normally,
and the booted os can work well on the situation.

i just to ask if you know why the boot will pause/freeze when resync is running?
any parts to modify to avoid it ?

thanks alot

AnthonySmith

has the initial sync completed, are you using centos 6 or 7?

AnthonySmith

please also provide a copy of your mdadm.conf and the output of 'cat /proc/mdstat' and 'df -h'

MSIUD

@AnthonySmith said:
has the initial sync completed, are you using centos 6 or 7?

Hi,

yes,the initial resync is finished,it is centos 7.

i find the issue is because i replace a new hdd and it run resync,
i try to restart vm and stop without loading well.

after finish resync,the booting are well,
i try to manually run the resync,
it happen again.

jackb

Lower dev.raid.speed_limit_min

MSIUD

@AnthonySmith said:
please also provide a copy of your mdadm.conf and the output of 'cat /proc/mdstat' and 'df -h'

Hi,

/etc/mdadm.conf as following

mdadm.conf written out by anaconda

MAILADDR root
AUTO +imsm +1.x -all
ARRAY /dev/md/boot_efi level=raid1 num-devices=4 UUID=933609e9:52db72c8:68fc6f5f:8a8fe413
ARRAY /dev/md/pv00 level=raid10 num-devices=4 UUID=f4059bb9:f422a2ea:01c5cf7c:68da5249
ARRAY /dev/md/root level=raid10 num-devices=4 UUID=4ed9045c:971494e6:8338c125:e29f956e
ARRAY /dev/md/swap level=raid10 num-devices=4 UUID=2dfd6d5e:042daad6:45f3e2d8:72997fb0

cat /proc/mdstat

Personalities : [raid10] [raid1]
md124 : active raid10 sda4[4] sdb4[1] sdd4[3] sdc4[2]
11606994944 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
bitmap: 1/87 pages [4KB], 65536KB chunk

md125 : active raid1 sda3[4] sdb3[1] sdd3[3] sdc3[2]
195520 blocks super 1.0 [4/4] [UUUU]
bitmap: 0/1 pages [0KB], 65536KB chunk

md126 : active raid10 sda2[4] sdb2[1] sdd2[3] sdc2[2]
8396800 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]

md127 : active raid10 sda1[4] sdb1[1] sdd1[3] sdc1[2]
104987648 blocks super 1.0 512K chunks 2 near-copies [4/4] [UUUU]
bitmap: 1/1 pages [4KB], 65536KB chunk

unused devices:

df -h

Filesystem Size Used Avail Use% Mounted on
/dev/md127 99G 65G 29G 70% /
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 17M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/md125 191M 9.8M 181M 6% /boot/efi
tmpfs 3.2G 0 3.2G 0% /run/user/0

thank you.

WSS

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MSIUD

@jackb said:
Lower dev.raid.speed_limit_min

i set to 15mb/s it be bootable,
will it not too slow ?

thank you

jackb

@MSIUD said:

@jackb said:
Lower dev.raid.speed_limit_min

i set to 15mb/s it be bootable,
will it not too slow ?

thank you

The lower limit just slows the resync while the system is under load. Normally it should be resyncing between the lower limit and the higher limit which should be fine