Month: May 2022

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Sorting ls Output Based on Time and Date

You may want to list the files in a directory based on last modified time and date from the latest to the oldest, you will need to use -t 

% ls -lt
drwxr-xr-x  26 root root    4096 Mar 29 13:40 mono
drwxr-xr-x   2 root root      42 Mar 29 13:40 mono-source-libs
lrwxrwxrwx   1 root root      22 Dec 21 12:55 libnss_centrifyda.so.0 -> libnss_centrifyda.so.2
drwxr-xr-x.  2 root root      62 Dec 21 12:54 security
lrwxrwxrwx   1 root root      22 Dec 21 12:54 libnss_centrifydc.so.0 -> libnss_centrifydc.so.2
lrwxrwxrwx   1 root root      28 Dec 21 12:54 libnss_centrify_logonly.so.0 -> libnss_centrify_logonly.so.2
-rwxr-xr-x   1 root root  238560 Nov 17 09:13 libnss_centrifydc.so.2
-rwxr-xr-x   1 root root  140064 Nov 17 09:13 libnss_centrify_logonly.so.2
-rwxr-xr-x   1 root root  159112 Nov  9 02:39 libnss_centrifyda.so.2
drwxr-xr-x   4 root root      40 Jul 25  2021 fastx
drwxr-xr-x.  2 root root     100 Dec 11  2020 modprobe.d
drwxr-xr-x   8 root root     180 Oct 26  2020 rstudio-server
.....
.....

If you want a sorting from the oldest to the latest, you use the -r option

% ls -ltr
.....
.....
-rwxr-xr-x   1 root root  159112 Nov  9 02:39 libnss_centrifyda.so.2
-rwxr-xr-x   1 root root  140064 Nov 17 09:13 libnss_centrify_logonly.so.2
-rwxr-xr-x   1 root root  238560 Nov 17 09:13 libnss_centrifydc.so.2
lrwxrwxrwx   1 root root      28 Dec 21 12:54 libnss_centrify_logonly.so.0 -> libnss_centrify_logonly.so.2
lrwxrwxrwx   1 root root      22 Dec 21 12:54 libnss_centrifydc.so.0 -> libnss_centrifydc.so.2
drwxr-xr-x.  2 root root      62 Dec 21 12:54 security
lrwxrwxrwx   1 root root      22 Dec 21 12:55 libnss_centrifyda.so.0 -> libnss_centrifyda.so.2
drwxr-xr-x   2 root root      42 Mar 29 13:40 mono-source-libs
drwxr-xr-x  26 root root    4096 Mar 29 13:40 mono
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Calculate Data Centre Cooling Requirements

The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) develops and publishes thermal and humidity guidelines for data centers. The latest edition outlines the temperatures and humidity levels at which you can reliably operate a data center based on the equipment classification.
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In the most recent guidelines, ASHRAE recommends that IT equipment be used with the following:
– Temperatures between 18 and 27 degrees C or 64 and 81 degrees F;
– dew point -9 degrees C to 15 degrees C; and
– relative humidity of 60%

How to calculate data center cooling requirements

General calculation you can start with to get a baseline British thermal unit (BTU) cooling size:
(Room square footage x 20) + (IT equipment watt usage x 3.14) + (Active people in the room x 400)

To Convert BTU/hour in watts, multiply by 0.293
To Convert Watts into BTU/hour, multiply by 3.41
To Convert Tons into watts, multiply by 3530
To convert Watts into Tons, multiply by 0.000283

How to calculate data center cooling requirements

For more information, do take a look at How to calculate data center cooling requirements