ch5.3 Storage - Troubleshooting Storage, Storage Usage + Quotas

Question 1

ulimit

Answer 1

Bash command that limits the system resources for a user in a Linux-based server

Question 2

df [options] [object names]

Answer 2

Bash command that displays the device’s storage space

Question 3

du [options] [object names]

Answer 3

Bash command that displays how a device is used

Question 4

I/O Scheduling

Answer 4

The process where the OS determines the order of input and output operations as they pertain to block storage devices

Question 5

CFQ Scheduler

Answer 5

Question 6

Deadline Scheduler

Answer 6

Question 7

Noop Scheduler

Answer 7

Question 8

What file to modify to set the scheduler used by each device?

Answer 8

/sys/block/queue/scheduler

Question 9

rewatch the scheduler section of the training ->

Section 5: Storage
45. Troubleshooting Storage Issues
starting at 2:13

Answer 9

rewatch the scheduler section of the training ->

Section 5: Storage
45. Troubleshooting Storage Issues
starting at 2:13

Question 10

iostat

Answer 10

Bash command that generates reports on CPU and device usage (input/output statistics)

Question 11

IOPS

Answer 11

Acronym that stands for Input/Output Per Second

If there is a low IOPS on a system, you can use the iostat Bash command to identify what kind of input/output is being generated

Question 12

tps (acronym)

Answer 12

Transfers (I/O requests) per second

Question 13

kB_read/s (acronym)

Answer 13

Number of blocks read per second

Question 14

kB_wrtn/s (acronym)

Answer 14

Number of blocks written per second

Question 15

kB_read (acronym)

Answer 15

Total number of blocks read

Question 16

kB_wrtn (acronym)

Answer 16

Total number of blocks written

Question 17

ioping

Answer 17

Generates a report of device I/O latency in real-time

Question 18

Storage Quota

Answer 18

The storage space allotted to a user for file storage on a computer

Used to prevent users from using up all of the storage space on a system, and either slowing the system down or crashing it.

Question 19

quotacheck -cug [mount point

Answer 19

Bash command to create quota database files for a file system and check for user and group quotas

Question 20

edquota -u [username]

Answer 20

Bash command to edit quotas for a specific user

Question 21

edquota -g [group name]

Answer 21

Bash command to edit quotas for a specific group

Question 22

setquota -u [username]

Answer 22

Bash command to edit quotas for a specific user

Question 23

setquota -g [group name]

Answer 23

Bash command to edit quotas for a specific group

Question 24

How to activate user and group quotas on the file system?

Answer 24

Edit the fstab file to add the options usrquota and grpquota to the relevant file system

(come back here and get the absolute path to the fstab file)

Question 25

What Bash command can also be used to admin quotas on specifically xfs file systems?

Answer 25

xfs_admin

Question 26

Quota Reports

Answer 26

Quota Reports are created by the system

Contents of a Report:
Name of the user/group
Number of blocks (in kilobytes) being used
User’s/Group’s storage soft limit
User’s/Group’s storage hard limit
Grace Period
Number of inodes used
Soft limit on inodes
Hard limit on Inodes

Question 27

repquota -a

Answer 27

Bash command to display the reports for all file systems indicated as read-write with quotas in the mtab file

Question 28

repquota -u [username]

Answer 28

Bash command to display the report for a particular user

Question 29

quota -ua [username]

Answer 29

Bash command to display the quota report for a particular user with verbose output

Question 30

warnquota -u

Answer 30

Bash command to check if users are not exceeding the allotted quota limit

Question 31

warnquota -g

Answer 31

Bash command to check if groups are not exceeding the allotted quota limit

Question 32

2nd Stanza

Answer 32

And sweetest - in the Gale - is heard -
And sore must be the storm -
That could abash the little Bird
That kept so many warm -

Question 33

Go back to the trouble shooter section ->

Section 5: Storage
45. Troubleshooting Storage Issues
starting at 11:59

Answer 33

Go back to the trouble shooter section ->

Section 5: Storage
45. Troubleshooting Storage Issues
starting at 11:59

Question 34

What tool should be used to create, manage, and monitor a RAID array?

Answer 34

mdadm

Question 35

What tool allows a system admin to specify how read, write, and status requests are made to a file system?

Answer 35

fuse