# echo 1 > /sys/block/sd_x/device/delete

where sd_x is the SD node (disk device) returned by the multipath command. Repeat this command for all paths related to this device.

For example:

#echo 1 > /sys/block/sdf/device/delete #echo 1 > /sys/block/sde/device/delete

5Remove mapping from MDSM, or delete the LUN if necessary.

6If you want to map another LUN or increase volume capacity, perform this action from MDSM.

NOTE: If you are only testing LUN removal, you can stop at this step.

7If a new LUN is mapped or volume capacity is changed, run the following command:

#rescan_dm_devs

8Use the multipath -llcommand to verify that:

•If a new LUN is mapped, the new LUN is detected and given a multi- pathing device node

•If you increased volume capacity, the new capacity is displayed.

Restricted Mappings

Many hosts are able to map up to 256 logical unit numbers (LUNs) (0 to 255) per storage partition. However, the maximum number of mappings differs because of operating system variables, failover driver issues, and potential data problems.

The hosts listed in the Table 9-3 have these mapping restrictions.

If you try to map a virtual disk to a LUN that exceeds the restriction on these operating systems, the host is unable to access the virtual disk.

Table 9-3. Mapping Restrictions

Operating System

Highest LUN

 

 

Windows Server 2003 and Windows server 2008

255

Linux

255

 

 

Guidelines when you work with host types with LUN mapping restrictions:

132

Configuration: Disk Groups and Virtual Disks

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Dell MD3600f, MD3620F owner manual Restricted Mappings, 132, Mapping Restrictions Operating System Highest LUN
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MD3620F, MD3600f specifications

Dell's MD3620F and MD3600F storage arrays are designed for businesses seeking dependable, high-performance storage solutions tailored to meet the demands of modern data management. These models offer a blend of scalability, efficiency, and advanced features, making them well-suited for a range of applications, from virtual environments to critical database operations.

One of the primary features of the MD3620F and MD3600F is their support for a hybrid storage architecture. This approach allows organizations to combine flash storage with traditional hard disk drives (HDDs) to optimize performance and cost. The MD3620F focuses heavily on all-flash configurations, delivering exceptional speed and lower latency, ideal for I/O-intensive workloads.

Scalability is another hallmark of these storage solutions. The MD3600F allows users to scale up to 120 drives, providing robust capacity to meet growing data needs. The MD3620F is engineered for environments where data availability and speed are paramount, with support for high IOPS (Input/Output Operations Per Second) and consistent performance under stress.

In terms of data management, both systems integrate with Dell’s proprietary software, which enhances operational efficiency through features like automated tiering. This technology optimizes data placement between different storage types based on access frequency, ensuring that hot data is readily available while reducing costs associated with less critical data.

Reliability is crucial for businesses that depend on their storage systems. The MD3620F and MD3600F come equipped with advanced data protection mechanisms, such as RAID support, which safeguards against data loss, and snapshot capabilities that provide point-in-time copies of data. Moreover, these solutions include hot-swappable components, ensuring minimal downtime for maintenance and repairs.

Connectivity is also a strong suit of these storage arrays. They support multiple connectivity options, including SAS and iSCSI, allowing for flexible integration into existing IT infrastructures. This adaptability enhances their appeal to a wide range of enterprise environments.

In summary, the Dell MD3620F and MD3600F stand out as robust storage solutions with a combination of hybrid and all-flash configurations, scalability, advanced data management tools, and enhanced reliability features. These characteristics make them ideal for organizations looking to enhance their data storage capabilities while maintaining high performance and efficiency.
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