Unsolved
2 Posts
0
626
March 25th, 2021 03:00
ME4024 dual raid reservation
Hello, we just bought DELL ME4024 with dual controller and i have a quastion. We have 2 Dell servers connected to our new ME4024 via SAS cables (one cable to each ME4024 controller).
Server 1 ---> ME4024 controller A, 0 port
Server 1 ---> ME4024 controller B, 0 port
Server 2 ---> ME4024 controller A, 1 port
Server 2 ---> ME4024 controller B, 1 port
I created 2 disk-groups RAID 10, 4x900GB SAS disk each (some reason, there was no possibility to create just 1 group with 8 disks, lol). Configured Pool, Volume, Initiators, Hosts and Host group, then configured ESXi and SAS Multipathing on our ESXi servers. Now it looks like this: https://ibb.co/y53Lqpr
So, how can i configure the storage reservation now? If storage A faults, how storage B will work?
I want somekind of RAID1 between storages A and B, if 1 fails the 2 works. Is it possible?
SlavicTattoo
2 Posts
0
March 25th, 2021 05:00
Dual-controller module configurations
A dual-controller module configuration improves application availability.
If a controller module failure occurs, the affected controller module fails over to the partner controller module with little interruption to
data flow. A failed controller module can be replaced without the need to shut down the storage system.
In a dual-controller module system, hosts use LUN-identifying information from both controller modules to determine the data paths are
available to a volume. Assuming MPIO software is installed, a host can use any available data path to access a volume that is owned by
either controller module. The path providing the best performance is through the host ports on the controller module that owns the
volume . Both controller modules share one set of 1,024 LUNs (0-1,023) for use in mapping volumes to hosts.
Page 26, Dell EMC PowerVault ME4 Series Storage System Deployment Guide.
So this will work as i expected.
DiegoLopez
4 Operator
•
2.7K Posts
0
March 25th, 2021 09:00
Hello @SlavicTattoo,
I understand for your last message that you don't need help because you found the solution by yourself.
But, please, if you have any questions or my understanding about your last message is not correct, do not hesitate to ask.
Regards.