Dell PowerStore 1200T EMC PowerStore Host Configuration Guide - Page 55

Boot from SAN

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Validation ● failback - "immediate" ● no_path_retry - "3" ● rr_min_io_rq - "1" ● fast_io_fail_tmo - "15" ● max_sectors_kb - "1024" NVMe Device Mapper Multipathing: Modify /etc/multipath.conf file as follows: ● vendor - ".*" ● product - "dellemc-powerstore" ● prio = ana ● uid_attribute = ID_WWN ● path_selector - "queue-length 0" ● path_grouping_policy - "group_by_prio" ● path_checker - "tur" ● detect_prio - "yes" ● failback - "immediate" ● no_path_retry - "3" ● rr_min_io_rq - "1" ● fast_io_fail_tmo - "15" iSCSI Configuration: When using PowerStore operating system 2.x (or later), configure two subnets. Impact Performance Stability iSCSI Configuration: Performance Modify /etc/iscsi/iscsid.conf file as follows: ● node.session.timeo.replacement_timeo ut = 15 ● node.startup = automatic iSCSI Configuration: Use _netdev or nofail option in /etc/ fstab Stability iSCSI Configuration: Use iSCSI interfaces Performance Temporarily disable UNMAP during file system creation. ● When creating a file system using the mke2fs command, use the "-E nodiscard" parameter. ● When creating a file system using the mkfs.xfs command, use the "-K" parameter. Performance Severity Refer to Section Recommended Configuration with Device Mapper Multipathing for SCSI Recommended Recommended PowerStore Operating System 2.x and Later Multi Subnet Updating iSCSI Configuration File Mandatory Recommended Recommended Mounting iSCSI File Systems iSCSI Session Configuration Creating a File System Boot from SAN For guidelines and recommendations for boot from SAN with Linux hosts and PowerStore, refer to the Considerations for Boot from SAN with PowerStore appendix. Host Configuration for Linux 55

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Validation
Impact
Severity
Refer to Section
●
failback - "immediate"
●
no_path_retry - "3"
●
rr_min_io_rq - "1"
●
fast_io_fail_tmo - "15"
●
max_sectors_kb - "1024"
NVMe Device Mapper Multipathing:
Modify
/etc/multipath.conf
file as
follows:
●
vendor - ".*"
●
product - "dellemc-powerstore"
●
prio = ana
●
uid_attribute = ID_WWN
●
path_selector - "queue-length 0"
●
path_grouping_policy -
"group_by_prio"
●
path_checker - "tur"
●
detect_prio - "yes"
●
failback - "immediate"
●
no_path_retry - "3"
●
rr_min_io_rq - "1"
●
fast_io_fail_tmo - "15"
Performance
Recommended
Configuration with Device
Mapper Multipathing for
SCSI
iSCSI Configuration:
When using PowerStore operating system
2.x (or later), configure two subnets.
Stability
Recommended
PowerStore Operating
System 2.x and Later -
Multi Subnet
iSCSI Configuration:
Modify
/etc/iscsi/iscsid.conf
file
as follows:
●
node.session.timeo.replacement_timeo
ut
= 15
●
node.startup
= automatic
Performance
Recommended
Updating iSCSI
Configuration File
iSCSI Configuration:
Use
_netdev
or
nofail
option in
/etc/
fstab
Stability
Mandatory
Mounting iSCSI File
Systems
iSCSI Configuration:
Use iSCSI interfaces
Performance
Recommended
iSCSI Session Configuration
Temporarily disable UNMAP during file
system creation.
●
When creating a file system using
the
mke2fs
command, use the "
-E
nodiscard
" parameter.
●
When creating a file system using the
mkfs.xfs
command, use the "
-K
"
parameter.
Performance
Recommended
Creating a File System
Boot from SAN
For guidelines and recommendations for boot from SAN with Linux hosts and PowerStore, refer to the
Considerations for Boot
from SAN with PowerStore
appendix.
Host Configuration for Linux
55