Reference Guide

In SUSE Linux Enterprise Server 12, the fdisk
command creates two links
In SUSE Linux Enterprise Server 12, the fdisk command creates two links to partition each device to maintain the backward compatibility.
/dev/mapper; one with the /dev/mapper/mpath<x>-part<y>
/dev/mapper/mpath<x>_part<y>
However, both links belong to the same partition of the multipathing device.
Issue with the set diskPool syntax
Command Line Interface (CLI) runs the parameter reservedDriveCount instead of reservedPhysicalDiskCount.
The correct syntax for the command is given here.
set diskPool [diskPoolName]
(addDrives=[trayID1,drawerID1,slotID1 ...
trayIDn,drawerIDn,slotIDn] |
addCapacity=(diskPoolCapacity))
[owner=(0| 1)]
RDVD usage with Red Hat Enterprise Linux 7
Prior to installing the Resource DVD (RDVD) for Red Hat Enterprise Linux 7, you must add the Compatibility Libraries Add-On.
Data Assurance Feature
The Data Assurance (DA) feature can increase data integrity across the entire storage system. DA enables the storage array to check for
errors that might occur when data is moved between the hosts and the physical disks. When this feature is enabled, the storage array
appends error-checking codes (also known as cyclic redundancy checks or CRCs) to each block of data in the virtual disk. After a data
block is moved, the storage array uses these CRC codes to determine if any errors occurred during transmission. Potentially corrupted data
is neither written to disk nor returned to the host.
The Data Assurance feature for the MD34/38 Series arrays requires both a hard drive that is Data Assurance compatible and the purchase
of the Data Assurance Premier Feature Key and installation of it on the array.
The compatibility of the disk can be seen in the Modular Disk Storage Manager (MDSM), when checking the physical disk information in
MDSM. It will show “Data Assurance (DA)” under “Physical Disk capabilities”, which means that the disk has the T10 Protection Information
(PI or T10 PI) capability. This allows a checksum to be transmitted from the controller to protect the integrity of the data.
Besides the hard drives having this capability, the array must enable the Data Assurance Premier Feature to utilize this feature.
The Data Assurance Premier Feature Key is optionally available only with the unbranded OEM version of the storage array.
There are no issues with utilizing drives that are Data Assurance compatible that do not have the Data Assurance Feature enabled, and
they are interchangeable with drives that do not have this capability when the Data Assurance Feature is not enabled.
Dell MD storage arrays—information update
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