А вот тут на что grub2-mkconfig и grub2-install ругаются ? Насколько это критично ?
При этом sda висит на SCSI 0:0 , а sdb на 0:1 - загрузка происходит быстро и нормально. FS на месте.
Если остановить машину и поменять диски местами, то тоже все хорошо.
В этом примере уже другая машина - / - 2G , swap - 1G.
[root@centos7 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
/usr/sbin/grub2-probe: warning: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
Found linux image: /boot/vmlinuz-3.10.0-327.13.1.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-327.13.1.el7.x86_64.img
/usr/sbin/grub2-probe: warning: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
/usr/sbin/grub2-probe: warning: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
/usr/sbin/grub2-probe: warning: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
Found linux image: /boot/vmlinuz-3.10.0-327.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-327.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-fc6a64c41e2e4536b262a8c9cf31abd0
Found initrd image: /boot/initramfs-0-rescue-fc6a64c41e2e4536b262a8c9cf31abd0.img
/usr/sbin/grub2-probe: warning: Couldn't find physical volume `(null)'. Some modules may be missing from core image..
done
[root@centos7 ~]# grub2-install /dev/sda
Installing for i386-pc platform.
grub2-install: warning: Couldn't find physical volume ‘(null)’. Some modules may be missing from core image..
grub2-install: warning: Couldn't find physical volume ‘(null)’. Some modules may be missing from core image..
Installation finished. No error reported.
[root@centos7 ~]# grub2-install /dev/sdb
Installing for i386-pc platform.
grub2-install: warning: Couldn't find physical volume ‘(null)’. Some modules may be missing from core image..
grub2-install: warning: Couldn't find physical volume ‘(null)’. Some modules may be missing from core image..
Installation finished. No error reported.
[root@centos7 ~]#
[root@centos7 ~]#
[root@centos7 ~]#
[root@centos7 ~]# fdisk -l
Disk /dev/sdb: 3221 MB, 3221225472 bytes, 6291456 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 4200447 2099200 fd Linux raid autodetect
/dev/sdb2 4200448 6291455 1045504 fd Linux raid autodetect
Disk /dev/sda: 3221 MB, 3221225472 bytes, 6291456 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 4200447 2099200 fd Linux raid autodetect
/dev/sda2 4200448 6291455 1045504 fd Linux raid autodetect
Disk /dev/md127: 1070 MB, 1070006272 bytes, 2089856 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/md126: 2149 MB, 2149515264 bytes, 4198272 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@centos7 ~]#
[root@centos7 ~]# cat /proc/mdstat
Personalities : [raid1]
md126 : active raid1 sdb1[2] sda1[3]
2099136 blocks super 1.0 [2/2] [UU]
bitmap: 0/1 pages [0KB], 65536KB chunk
md127 : active raid1 sdb2[2] sda2[3]
1044928 blocks super 1.2 [2/2] [UU]
unused devices:
[root@centos7 ~]#
[root@centos7 ~]# mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=932904k,nr_inodes=233226,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,seclabel,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/md126 on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=30,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
mqueue on /dev/mqueue type mqueue (rw,relatime,seclabel)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,seclabel,size=188440k,mode=700)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
[root@centos7 ~]#