如何从操作系统验证RAID中的磁盘数量

Question

我们有Linux服务器- 7.6版本。

在服务器磁盘中：

lsblk -S
NAME HCTL       TYPE VENDOR   MODEL             REV TRAN
sda  0:2:0:0    disk DELL     PERC FD33xD      4.27
sdb  1:0:0:0    disk ATA      INTEL SSDSC1BG40 DL2B sata
sdc  2:0:0:0    disk ATA      INTEL SSDSC1BG40 DL2B sata

sdc和sdb是OS磁盘。

关于sda是由RAID表示的磁盘

因此，sda包含磁盘数量，但问题是如何计算RAID中的磁盘数量。

我们尝试了以下操作，但不确定这个cli是否描述了RAID中的磁盘数量？

smartctl --scan
/dev/sda -d scsi # /dev/sda, SCSI device
/dev/sdb -d scsi # /dev/sdb, SCSI device
/dev/sdc -d scsi # /dev/sdc, SCSI device
/dev/bus/0 -d megaraid,0 # /dev/bus/0 [megaraid_disk_00], SCSI device
/dev/bus/0 -d megaraid,1 # /dev/bus/0 [megaraid_disk_01], SCSI device
/dev/bus/0 -d megaraid,2 # /dev/bus/0 [megaraid_disk_02], SCSI device
/dev/bus/0 -d megaraid,3 # /dev/bus/0 [megaraid_disk_03], SCSI device
/dev/bus/0 -d megaraid,4 # /dev/bus/0 [megaraid_disk_04], SCSI device
/dev/bus/0 -d megaraid,5 # /dev/bus/0 [megaraid_disk_05], SCSI device
/dev/bus/0 -d megaraid,6 # /dev/bus/0 [megaraid_disk_06], SCSI device
/dev/bus/0 -d megaraid,7 # /dev/bus/0 [megaraid_disk_07], SCSI device
/dev/bus/0 -d megaraid,8 # /dev/bus/0 [megaraid_disk_08], SCSI device
/dev/bus/0 -d megaraid,9 # /dev/bus/0 [megaraid_disk_09], SCSI device
/dev/bus/0 -d megaraid,10 # /dev/bus/0 [megaraid_disk_10], SCSI device
/dev/bus/0 -d megaraid,11 # /dev/bus/0 [megaraid_disk_11], SCSI device
/dev/bus/0 -d megaraid,12 # /dev/bus/0 [megaraid_disk_12], SCSI device
/dev/bus/0 -d megaraid,13 # /dev/bus/0 [megaraid_disk_13], SCSI device
/dev/bus/0 -d megaraid,14 # /dev/bus/0 [megaraid_disk_14], SCSI device
/dev/bus/0 -d megaraid,15 # /dev/bus/0 [megaraid_disk_15], SCSI device


lspci -vv | grep -i raid
06:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS-3 3108 [Invader] (rev 02)
        Kernel driver in use: megaraid_sas

 mdadm --detail /dev/sda
mdadm: /dev/sda does not appear to be an md device


 cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdb2[0] sdc2[1]
      390054912 blocks super 1.2 [2/2] [UU]
      bitmap: 2/3 pages [8KB], 65536KB chunk

md0 : active raid1 sdb1[0] sdc1[1]
      524224 blocks super 1.0 [2/2] [UU]
      bitmap: 0/1 pages [0KB], 65536KB chunk

unused devices: <none>

lsscsi
[0:2:0:0]    disk    DELL     PERC FD33xD      4.27  /dev/sda
[1:0:0:0]    disk    ATA      INTEL SSDSC1BG40 DL2B  /dev/sdb
[2:0:0:0]    disk    ATA      INTEL SSDSC1BG40 DL2B  /dev/sdc




   cat /proc/partitions
major minor  #blocks  name

   8        0 13670809600 sda
   8       16  390711384 sdb
   8       17     524288 sdb1
   8       18  390185984 sdb2
   8       32  390711384 sdc
   8       33     524288 sdc1
   8       34  390185984 sdc2
   9        0     524224 md0
   9        1  390054912 md1
 253        0  104857600 dm-0
 253        1   16777216 dm-1
 253        2  104857600 dm-2
 253        3   10485760 dm-3



 ll /sys/block/
total 0
lrwxrwxrwx 1 root root 0 Oct 17 07:27 dm-0 -> ../devices/virtual/block/dm-0
lrwxrwxrwx 1 root root 0 Oct 17 07:27 dm-1 -> ../devices/virtual/block/dm-1
lrwxrwxrwx 1 root root 0 Oct 17 07:27 dm-2 -> ../devices/virtual/block/dm-2
lrwxrwxrwx 1 root root 0 Oct 17 07:27 dm-3 -> ../devices/virtual/block/dm-3
lrwxrwxrwx 1 root root 0 Oct 17 07:27 md0 -> ../devices/virtual/block/md0
lrwxrwxrwx 1 root root 0 Oct 17 07:27 md1 -> ../devices/virtual/block/md1
lrwxrwxrwx 1 root root 0 Oct 17 07:27 sda -> ../devices/pci0000:00/0000:00:03.0/0000:02:00.0/0000:03:01.0/0000:04:00.0/0000:05:01.0/0000:06:00.0/host0/target0:2:0/0:2:0:0/block/sda
lrwxrwxrwx 1 root root 0 Oct 17 07:27 sdb -> ../devices/pci0000:00/0000:00:11.4/ata1/host1/target1:0:0/1:0:0:0/block/sdb
lrwxrwxrwx 1 root root 0 Oct 17 07:27 sdc -> ../devices/pci0000:00/0000:00:11.4/ata2/host2/target2:0:0/2:0:0:0/block/sdc


ll /sys/block/ |grep 'primary'

no output

Answer 1

当你读到

md0 : active raid1 sdb1[0] sdc1[1]
      524224 blocks super 1.0 [2/2] [UU]
      bitmap: 0/1 pages [0KB], 65536KB chunk

在[2/2]中，前两个是用于RAID的活动磁盘数量，第二个是应该活动以避免RAID降级的磁盘数量。