Developers Guide

ASM best practices with SC Series storage
13 Dell EMC SC Series Storage with Oracle ASM | CML1111
4 ASM best practices with SC Series storage
For best practices with Dell EMC SC Series storage and ASM, see the document, Dell EMC SC Series Arrays
and Oracle. This document includes information on:
• Fibre Channel connectivity
• Zoning
• SC Series virtual port mode
• SC Series volume size and quantity
• Dynamic multipathing
• Partitioning or not partitioning ASM disks
• Partition alignment
• Storage profiles
• Snapshot (Replay) profiles
Additional information is provided as follows:
LUN sizes can vary depending on the size of the database. Generally, Dell EMC does not recommend any
LUN size greater than 1 TB. If a database is roughly 1 TB in size, 4 x 250 GB LUNs might be a good number
of LUNs to start with for the ASM disk groups.
When using Red Hat or Oracle Linux versions 6 or 7, ensure /etc/multipath.conf contains a device stanza for
Compellent devices and the following default settings:
defaults {
find_multipaths yes
user_friendly_names yes
polling_interval 5
}
devices {
device {
vendor "COMPELNT"
product "Compellent Vol"
features "0"
hardware_handler "0"
prio "const"
no_path_retry 24
path_grouping_policy "multibus"
path_checker "tur"
failback immediate
rr_weight "uniform"
fast_io_fail_tmo 5
dev_loss_tmo infinity
path_selector "round-robin 0"
}
}
For additional multipath information, see the My Oracle Support (MOS) document 1538626.1, SC Series
Storage System Owner’s Manual, Dell Storage Center Deployment Guide, and Dell EMC SC Series with Red
Hat Enterprise Linux 6x best practices.