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Old 11-07-2020, 03:21 AM   #1
n00b_noob
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Post Disk usage.

Hello,
In a RAID system as below, How can I see the free space of specific HDD?
Code:
# df
Filesystem                Size      Used Available Use% Mounted on
/dev/ram0               151.1M    129.4M     21.7M  86% /
devtmpfs                  3.8G      4.0k      3.8G   0% /dev
tmpfs                    64.0M    728.0k     63.3M   1% /tmp
tmpfs                     3.8G         0      3.8G   0% /dev/shm
/dev/md9                509.5M    124.6M    384.9M  24% /mnt/HDA_ROOT
/dev/mapper/cachedev1    29.2T     23.2T      6.0T  79% /share/CACHEDEV1_DATA
/dev/mapper/cachedev2     2.9T    303.6G      2.6T  10% /share/CACHEDEV2_DATA
/dev/mapper/cachedev3     9.9T      7.5T      2.4T  76% /share/CACHEDEV3_DATA
/dev/mapper/cachedev4    25.8T     17.7T      8.1T  69% /share/CACHEDEV4_DATA
/dev/mapper/cachedev6   498.0G    496.2G      1.4G 100% /share/CACHEDEV6_DATA
/dev/mapper/cachedev7  1019.9G    990.0G     29.5G  97% /share/CACHEDEV7_DATA
/dev/mapper/cachedev9     5.0T      3.6T      1.4T  72% /share/CACHEDEV9_DATA
/dev/mapper/cachedev10   199.2G     31.5G    167.2G  16% /share/CACHEDEV10_DATA
/dev/mapper/cachedev11  1019.9G    240.5G    778.9G  24% /share/CACHEDEV11_DATA
/dev/mapper/cachedev13     2.0T      1.1T    862.9G  58% /share/CACHEDEV13_DATA
/dev/mapper/cachedev14   796.8G    434.5G    361.9G  55% /share/CACHEDEV14_DATA
/dev/mapper/cachedev15   498.0G    459.3G     38.2G  92% /share/CACHEDEV15_DATA
/dev/mapper/cachedev18    99.6G      5.9G     93.2G   6% /share/CACHEDEV18_DATA
/dev/mapper/cachedev19  1019.9G    293.6G    725.8G  29% /share/CACHEDEV19_DATA
/dev/mapper/cachedev21   298.8G    127.4G    170.9G  43% /share/CACHEDEV21_DATA
/dev/md13               371.0M    288.3M     82.6M  78% /mnt/ext
tmpfs                     8.0M         0      8.0M   0% /var/syslog_maildir
tmpfs                    32.0M         0     32.0M   0% /.eaccelerator.tmp
For example, I want to see the free space of "/dev/sdy".
Code:
# ls /dev/sdy
sdy   sdy1  sdy2  sdy3
Thank you.
 
Old 11-07-2020, 03:38 AM   #2
berndbausch
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Find out which filesystems, logical volumes, RAID devices etc. use /dev/sdy, then find out how much space they occupy. I would use commands like lsblk, blkid, mdadm.

By the way, what do you mean by "free space"? /dev/sdy could be entirely used up by a RAID device. Half of that RAID device might be occupied by a logical volume. The filesystem on that logical volume is, say, 80% full. How much free space is on /dev/sdy? You can say no free space, since /dev/sdy is entirely used up by the RAID. Or you could say 50%, because half of the RAID device is free. Or 40%. Which free space do you mean?
 
Old 11-07-2020, 04:01 AM   #3
n00b_noob
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Quote:
Originally Posted by berndbausch View Post
Find out which filesystems, logical volumes, RAID devices etc. use /dev/sdy, then find out how much space they occupy. I would use commands like lsblk, blkid, mdadm.

By the way, what do you mean by "free space"? /dev/sdy could be entirely used up by a RAID device. Half of that RAID device might be occupied by a logical volume. The filesystem on that logical volume is, say, 80% full. How much free space is on /dev/sdy? You can say no free space, since /dev/sdy is entirely used up by the RAID. Or you could say 50%, because half of the RAID device is free. Or 40%. Which free space do you mean?
Thank you.
The output is:
Code:
# blkid
/dev/mapper/cachedev1: LABEL=
/dev/mapper/cachedev2: LABEL=
/dev/mapper/cachedev3: LABEL=
/dev/mapper/cachedev4: LABEL=
/dev/mapper/cachedev6: LABEL= 
/dev/mapper/cachedev7: LABEL=
/dev/mapper/cachedev9: LABEL=
/dev/mapper/cachedev10: LABEL=
/dev/mapper/cachedev11: LABEL=
/dev/mapper/cachedev13: LABEL=
/dev/mapper/cachedev14: LABEL= 
/dev/mapper/cachedev15: LABEL=
/dev/mapper/cachedev18: LABEL=
/dev/mapper/cachedev19: LABEL=
/dev/mapper/cachedev21: LABEL=
/dev/sda1: UUID="90a34014-e609-4965-b6b4-95f277bfdf23" TYPE="ext2" 
/dev/sda2: UUID="135625c2-46f0-47a9-81b9-6cd15229abae" TYPE="ext2" 
/dev/sda3: UUID="7fb2754b-6d1b-4dfa-8ead-4a5eb14080be" TYPE="ext2" 
/dev/sda5: UUID="ba5d6eee-24a9-43bc-b861-8f4ebfbcd2c7" TYPE="ext2" 
/dev/sda6: UUID="c5a5224c-2a7e-46b4-b98c-e87b07fd65f9" TYPE="ext2" 
/dev/sdb1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdb2: TYPE="swap" UUID="bc9975d8-6353-4a1b-9d36-edeeac541891" 
/dev/sdb3: UUID="2eJHix-PwVI-7RAu-BOJQ-WeEk-gkKo-IfQtrZ" TYPE="lvm2pv" 
/dev/sdb4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdb5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdc1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdc2: TYPE="swap" UUID="bc9975d8-6353-4a1b-9d36-edeeac541891" 
/dev/sdc4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdc5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdd1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdd4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdd5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sde1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sde4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sde5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdf1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdf4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdf5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdg1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdg4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdg5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdh1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdh4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdh5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdi1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdi4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdi5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdj1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdj4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdj5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdk1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdk4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdk5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdm1: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/sdm4: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/sdm5: TYPE="swap" UUID="f5b04666-d13a-4d38-b3af-34bcad657ffa" 
/dev/sdp5: TYPE="swap" UUID="ca49880b-2d71-4ce8-9a38-88b756cb4d9e" 
/dev/sdr2: TYPE="swap" UUID="dba92ae2-5f25-42cd-9bf4-80a752b9e7f0" 
/dev/sdr3: UUID="xFZCoz-eVv1-Ccqn-0jgP-KbcM-j73h-HFVzxy" TYPE="lvm2pv" 
/dev/sdt5: TYPE="swap" UUID="ca49880b-2d71-4ce8-9a38-88b756cb4d9e" 
/dev/sdu5: TYPE="swap" UUID="ca49880b-2d71-4ce8-9a38-88b756cb4d9e" 
/dev/sdv5: TYPE="swap" UUID="ca49880b-2d71-4ce8-9a38-88b756cb4d9e" 
/dev/sdaa5: TYPE="swap" UUID="ca49880b-2d71-4ce8-9a38-88b756cb4d9e" 
/dev/md9: UUID="b8cea29e-3b71-48b8-afa1-8db355428e0f" TYPE="ext3" 
/dev/md13: UUID="17888dd8-8db3-49b5-8461-b5d4a8c1c0e3" TYPE="ext3" 
/dev/md256: TYPE="swap" UUID="bc9975d8-6353-4a1b-9d36-edeeac541891" 
/dev/md258: TYPE="swap" UUID="dba92ae2-5f25-42cd-9bf4-80a752b9e7f0" 
/dev/md1: UUID="2eJHix-PwVI-7RAu-BOJQ-WeEk-gkKo-IfQtrZ" TYPE="lvm2pv" 
/dev/md2: UUID="xFZCoz-eVv1-Ccqn-0jgP-KbcM-j73h-HFVzxy" TYPE="lvm2pv" 
/dev/dm-2: LABEL=
/dev/dm-3: LABEL=
/dev/dm-4: LABEL= 
/dev/dm-5: LABEL= 
/dev/dm-6: LABEL=
/dev/dm-7: LABEL=
/dev/dm-8: LABEL=
/dev/dm-10: LABEL=
/dev/dm-11: LABEL=
/dev/dm-12: LABEL=
/dev/dm-14: LABEL=
/dev/dm-15: LABEL=
/dev/dm-16: LABEL=
/dev/dm-17: LABEL=
/dev/dm-18: LABEL= 
/dev/dm-19: LABEL=
/dev/dm-20: LABEL=
/dev/dm-21: LABEL=
/dev/sdn2: TYPE="swap" UUID="dba92ae2-5f25-42cd-9bf4-80a752b9e7f0"
 
Old 11-07-2020, 05:42 AM   #4
ondoho
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Quote:
Originally Posted by n00b_noob View Post
How can I see the free space of specific HDD?
It's the "Available" column.
 
1 members found this post helpful.
Old 11-07-2020, 07:18 PM   #5
frankbell
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This article may help: https://www.linuxjournal.com/article/2597

Note that df lists not just physical devices, but also virtual ones, such as, for example, tmpfs.
 
  


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