This Markdown cheat sheet provides a quick overview of all the Markdown syntax elements. It can’t cover every edge case, so if you need more information about any of these elements, refer to the reference guides for basic syntax and extended syntax. Step 2: Create a simple MD file. Open VS Code on an empty folder and create a sample.md file. Note: You can open a folder with VS Code by either selecting the folder with File Open Folder or navigating to the folder and typing 'code.' At the command line. Place the following source code in that file: # Hello Markdown in VS Code! X file Check if we have execute access to file.f file Check if file is an ordinary file (as opposed to a directory, a device special file, etc.) -s file Check if file has size greater than 0.d file Check if file is a directory.e file Check if file exists. Is true even if file is a directory. Example: if -s file then. Displays the contents of a text file. Type FILE more FILE ← Displays one screen of output at a time. Copies one or more files from one location to another. Copy FILE FOLDER copy /y FILE1 FILE2 ← Suppresses prompting to confirm that you overwrite an existing destination file. Fifa download for mac free download. Deletes one or more files. The configuration file md.conf contains fields like nmd (i.e. Number of volumes (metadevices) that the configuration supports) etc. The file can be edited to change the default values for various such parameters. /etc/rcS.d/S35svm.init The RC script configures and starts SVM at boot and can be used to start/stop the daemons.
Mdadm is the modern tool most Linux distributions use these days to manage software RAID arrays; in the past raidtools was the tool we have used for this. This cheat sheet will show the most common usages of mdadm to manage software raid arrays; it assumes you have a good understanding of software RAID and Linux in general, and it will just explain the commands line usage of mdadm. The examples bellow use RAID1, but they can be adapted for any RAID level the Linux kernel driver supports.
1. Create a new RAID array
Create (mdadm --create) is used to create a new array:
or using the compact notation:
2. /etc/mdadm.conf
/etc/mdadm.conf or /etc/mdadm/mdadm.conf (on debian) is the main configuration file for mdadm. After we create our RAID arrays we add them to this file using:
or on debian
3. Remove a disk from an array
We can’t remove a disk directly from the array, unless it is failed, so we first have to fail it (if the drive it is failed this is normally already in failed state and this step is not needed):
and now we can remove it:
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This can be done in a single step using:
4. Add a disk to an existing array
We can add a new disk to an array (replacing a failed one probably):
5. Verifying the status of the RAID arrays
We can check the status of the arrays on the system with:
or
The output of this command will look like:
here we can see both drives are used and working fine - U. A failed drive will show as F, while a degraded array will miss the second disk -
Note: while monitoring the status of a RAID rebuild operation using watch can be useful:
6. Stop and delete a RAID array
If we want to completely remove a raid array we have to stop if first and then remove it:
and finally we can even delete the superblock from the individual drives:
Finally in using RAID1 arrays, where we create identical partitions on both drives this can be useful to copy the partitions from sda to sdb:
(this will dump the partition table of sda, removing completely the existing partitions on sdb, so be sure you want this before running this command, as it will not warn you at all).
There are many other usages of mdadm particular for each type of RAID level, and I would recommend to use the manual page (man mdadm) or the help (mdadm –help) if you need more details on its usage. Hopefully these quick examples will put you on the fast track with how mdadm works.
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