Release Notes

Table Of Contents
Disk drives part of MD RAID are not listed as
installation destination by the installer
Description: During installation, if a disk drive which was previously part of MD RAID volume is used, it is not listed as
an installation destination by the operating system installer.
Applies to:
Red Hat Enterprise Linux 7.0 and later.
Solution: The drive must be formatted. For more information, see Red Hat Enterprise Linux Knowledge Base article
5801081.
Systems
affected:
All Dell EMC PowerEdge servers
Tracking number: 192006
Dell EMC OpenManage Storage Services utility fails to
reconfigure the virtual disk
Description: On a system with multiple guest VMs running storage IO and network IO operations, Dell EMC
OpenManage Storage Services utility fails to reconfigure the virtual disk that is connected to the PERC
H755 or PERC H755N card. The dmesg displays following call trace indicating page allocation failure for
high order memory allocation requests:
dsm_sa_datamgrd: page allocation failure: order:6,
mode:0x6000c0(GFP_KERNEL), nodemask=(null),cpuset=/,mems_allowed=0-1
dmesg also shows following messages:
megaraid_sas 0000:01:00.0: Failed to alloc kernel SGL buffer for IOCTL
megaraid_sas 0000:01:00.0: Failed to alloc kernel SGL buffer for IOCTL
The issue may occur when the operating system is under pressure for high-order memory.
Applies to: Red Hat Enterprise Linux 8.3
Workaround: Reconfigure the virtual disk from the Integrated Dell Remote Access Controller (iDRAC).
Cause: By default, the 'cache' setting for VMs is set to writeback. This results in host memory being used for
buffer cache when storage IO is being performed by guest VMs.
Solution: Modify the 'cache' setting for guest VMs to 'none'. For more information, see Red Hat Enterprise Linux
Knowledge Base article 5905701.
In the XML profile of guest VMs, change the following:
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
To
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
Systems
affected:
All Dell EMC PowerEdge servers
Tracking number: 194332
Fixes 13