Some "dispappered" dm-? files under the /dev directory
Recently I took over a few RHEL systems running with the native DM-multipath, which had been installed & configured by other persons.
My doubts focus on the following questions:
1. Why there would only a part of dm-? files from dm10~dm19 under the /dev directory
2. Why all the mapper files do not point to their corresponding symbol link dm-? files
Note: but all the complete dm-? in the system kernel can still be seen from the /proc/partitions.
Despite these symptoms, all the systems running with the native DM-multipath can do work fine.
# # # ls -ltr /dev/mapper total 0 crw------- 1 root root 10, 60 Jun 22 2021 control brw-rw---- 1 root disk 253, 9 Jun 22 2021 vgroot-Lvswap brw-rw---- 1 root disk 253, 10 Jun 22 2021 3600c0ff0001582e1dc40b45101000000 brw-rw---- 1 root disk 253, 17 Jun 22 2021 3600c0ff0001582e1bdaa115201000000 brw-rw---- 1 root disk 253, 13 Jun 22 2021 3600c0ff0001582e1bc43b45101000000 brw-rw---- 1 root disk 253, 16 Jun 22 2021 3600c0ff0001582e189aa115201000000 brw-rw---- 1 root disk 253, 12 Jun 22 2021 3600c0ff0001582e16641b45101000000 brw-rw---- 1 root disk 253, 15 Jun 22 2021 3600c0ff0001582e15bceba5101000000 brw-rw---- 1 root disk 253, 14 Jun 22 2021 3600c0ff0001582e13bceba5101000000 brw-rw---- 1 root disk 253, 11 Jun 22 2021 3600c0ff0001582e11141b45101000000 brw-rw---- 1 root disk 253, 18 Jun 22 2021 3600c0ff0001581c1ca81625501000000 brw-rw---- 1 root disk 253, 19 Jun 22 2021 3600c0ff0001581c1895b895901000000 brw-rw---- 1 root disk 253, 20 Jun 22 2021 vgoms-lvoms brw-rw---- 1 root disk 253, 21 Jun 22 2021 vghes-lvhes brw-rw---- 1 root disk 253, 22 Jun 22 2021 vgdata-lvoadata brw-rw---- 1 root disk 253, 24 Jun 22 2021 vgdata-lvhnweb brw-rw---- 1 root disk 253, 23 Jun 22 2021 vgdata-lvdocdata brw-rw---- 1 root disk 253, 0 Jun 22 2021 vgroot-Lvroot brw-rw---- 1 root disk 253, 1 Jun 22 2021 vgroot-Lvhome brw-rw---- 1 root disk 253, 2 Jun 22 2021 vgroot-Lvvar brw-rw---- 1 root disk 253, 3 Jun 22 2021 vgroot-Lvtmp brw-rw---- 1 root disk 253, 4 Jun 22 2021 vgroot-Lvinstall brw-rw---- 1 root disk 253, 5 Jun 22 2021 vgroot-Lvusr brw-rw---- 1 root disk 253, 6 Jun 22 2021 vgroot-Lvopenv brw-rw---- 1 root disk 253, 7 Jun 22 2021 vgroot-Lvapp brw-rw---- 1 root disk 253, 8 Jun 22 2021 vgroot-Lvoracle brw-rw---- 1 root disk 253, 25 Nov 23 17:24 vgqdisk-lvqdisk # # # # ls -l /dev/dm-* brw-rw---- 1 root root 253, 10 Jun 22 2021 /dev/dm-10 brw-rw---- 1 root root 253, 11 Jun 22 2021 /dev/dm-11 brw-rw---- 1 root root 253, 12 Jun 22 2021 /dev/dm-12 brw-rw---- 1 root root 253, 13 Jun 22 2021 /dev/dm-13 brw-rw---- 1 root root 253, 14 Jun 22 2021 /dev/dm-14 brw-rw---- 1 root root 253, 15 Jun 22 2021 /dev/dm-15 brw-rw---- 1 root root 253, 16 Jun 22 2021 /dev/dm-16 brw-rw---- 1 root root 253, 17 Jun 22 2021 /dev/dm-17 brw-rw---- 1 root root 253, 18 Jun 22 2021 /dev/dm-18 brw-rw---- 1 root root 253, 19 Jun 22 2021 /dev/dm-19 # # # # cat /proc/partitions major minor #blocks name 104 0 292935982 cciss/c0d0 104 1 104391 cciss/c0d0p1 104 2 292824787 cciss/c0d0p2 8 0 976512 sda 8 16 97656192 sdb 8 32 97656192 sdc 8 48 97656192 sdd 8 64 97656192 sde 8 80 97656192 sdf 8 96 97656192 sdg 8 112 97656192 sdh 8 128 585937472 sdi 8 144 989858240 sdj 8 160 976512 sdk 8 176 97656192 sdl 8 192 97656192 sdm 8 208 97656192 sdn 8 224 97656192 sdo 8 240 97656192 sdp 65 0 97656192 sdq 65 16 97656192 sdr 65 32 585937472 sds 65 48 989858240 sdt 253 0 10485760 dm-0 253 1 5242880 dm-1 253 2 5242880 dm-2 253 3 5242880 dm-3 253 4 15728640 dm-4 253 5 10485760 dm-5 253 6 20971520 dm-6 253 7 20971520 dm-7 253 8 62914560 dm-8 253 9 16777216 dm-9 253 10 976512 dm-10 253 11 97656192 dm-11 253 12 97656192 dm-12 253 13 97656192 dm-13 253 14 97656192 dm-14 253 15 97656192 dm-15 253 16 97656192 dm-16 253 17 97656192 dm-17 253 18 585937472 dm-18 253 19 989858240 dm-19 253 20 989855744 dm-20 253 21 585105408 dm-21 253 22 209715200 dm-22 253 23 209715200 dm-23 253 24 209715200 dm-24 253 25 974848 dm-25 # #
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