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December 9th, 2021 14:00
Create Volumes on ME4012
when creating volumes such as 3TB, then in fact I will get a smaller volume size, also when connected to the ISCSI host, the size of the resulting volume on the host becomes even smaller! Why is the size decreasing?I read all the documents for storage but found no reason.
Virtual pool - RAID-6
Storage media - 12 * 4TB 7.2K RPM NLSAS 512n 3.5in Hot-plug Hard Drive
Dell- Maria J
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278 Posts
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December 10th, 2021 02:00
Hello BasylWolf,
Thank you for choosing Dell.
May I please ask you, where do you check the capacity of the volume?
In some instances, the capacity of the volume shown in the operating system appears noticeably less than the capacity showing in MESM (ME Storage Manager) or CLI. This is not an error and is part of the normal system operations.
MESM displays space in decimal format (base-10), by default. Operating systems display storage space (volumes) in binary format (base-2) and this is the reason for the apparent discrepancy. Base 10 values are called Gigabytes, abbreviated GB, and Base 2 values are called Gibibytes, abbreviated GiB. In order to confirm the capacity of the volume shown in the operating system matches the capacity showing in MESM (ME Storage Manager) or CLI, is to convert the GB to GiB or to convert the Base 10 Bytes to Base 2 bytes. Please see the worked examples below:
-Base 2 - Sizes are shown as powers of 2, using 1024 as a divisor for each magnitude (MiB, GiB, TiB).
-Base 10 - Sizes are shown as powers of 10, using 1000 as a divisor for each magnitude (MB, GB, TB).
Source: https://dell.to/3dCEa1E p.42
Gigabytes example:
500 GB volume is approximately 500,000,000,000 bytes
Note: 1 GB = 1^10 bytes = 1,000,000,000 bytes
Gibibytes example:
500 GB volume is approximately 500,000,000,000 bytes
Note: 1 GiB = 2^30 bytes = 1,073,741,824 bytes
GB to GiB example
500,000,000,000 bytes / 1,073,741,824 Base 2 bytes = 465.661 GB
Below are the Decimal to Binary capacity conversion formulas, for MB/GB/TB:
Decimal capacity in bytes / 1,048,576 = Binary MB capacity
Decimal capacity in bytes / 1,073,741,824 = Binary GB capacity
Decimal capacity in bytes / 1,099,511,627,776 = Binary TB capacity
How to check Base Preference in MESM:
-Launch MESM
-Navigate to the Home tab if needed
-Click the Action button in the upper left
-Select System Settings
-Click on the Manage Users Tab
-In this Tab - Preferences - Base Preference
Source: https://dell.to/3oPKQAh
Please ask me, if you have any questions
Maria Januszka
#IWork4Dell
Dell | Social Outreach Services - Enterprise