Failover issue when a large number of LUNs are attached
to a Linux host
When a large number of LUNs (84 LUNs) are attached to a Linux host, the LUNs might fail to reattach to the host after a failover. This
issue affects hosts running Red Hat Enterprise Linux 8 and SUSE Linux Enterprise Server 15.
The following sections contain workarounds for this issue:
Red Hat Enterprise Linux 8
Before mapping LUNs to the host, edit the /etc/fstab file and add a device timeout setting of 0 to all the x-systemd.device-
timeout entries for ME484 JBOD LUNs..
• If the value defaults is displayed in the <options> column, replace the value defaults with a device timeout setting of 0.
• If the <options> column already contains device timeout settings, add a comma to the end of the last setting and add a device
timeout setting of 0.
SUSE Linux Enterprise Server 15
1. Attach the ME484 JBOD to the host.
2. Configure the multipath.conf file.
3. Run the following commands to enable multipath when the host boots:
dracut --force --add multipath
dracut -f -v
dracut -v -f --add multipath
4. Reboot the host.
Other Information You May Need
The product documentation for the ME484 JBOD includes:
• The Dell EMC PowerVault ME4 Series Storage System Owner’s Manual provides information about ME4 Series system hardware
features and describes how to troubleshoot the system and install or replace system components.
• The Dell EMC Storage PowerTools Server Hardware Manager Administrator’s Guide describes how to use the Server Hardware
Manager software to manage an ME484 JBOD.
• The Dell EMC PowerVault ME484 JBOD Storage Enclosure Support Matrix and Dell EMC Storage PowerTools Server Hardware
Manager Support Matrix provide information about the software and hardware compatibility requirements for the Server Hardware
Manager software.
NOTE:
For additional documentation about the ME484 JBOD, go to Dell.com/support.
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