Dell Acceleration Appliances for Databases - Manual (Page 65)

For best use with NUMA initiators, each storage volume should be exported only to initiator ports on
one of the initiator’s NUMA nodes. When multiple volumes are used, access should be distributed
between the NUMA nodes such that ports on all NUMA nodes are in use, but a single volume is
accessed only through one NUMA node. This reduces inter-node data traffic and improves the
effectiveness of any storage tuning.
MOUNTING A FILESYSTEM ON A LUN DURING LINUX BOOT TIME
In order to mount a filesystem on top of an ION Accelerator LUN, during Linux system boot time,
follow these steps:
1. Determine the iSCSI ID of the ION Accelerator LUN. This is the number shown between
parentheses in the output of multipath -l that starts with the digit “2” (indicated by the
arrows below). For example:
# multipath -l
26164613638323832 dm-0 FUSIONIO,ION LUN
size=34G features='3 queue_if_no_path pg_init_retries 50'
hwhandler='0' wp=rw
`-+- policy='queue-length 0' prio=0 status=active
`- 17:0:0:0 sdc 8:32 active undef running
23630313437393135 dm-1 FUSIONIO,ION LUN
size=31G features='3 queue_if_no_path pg_init_retries 50'
hwhandler='0' wp=rw
`-+- policy='queue-length 0' prio=0 status=active
`- 17:0:0:1 sdd 8:48 active undef running
2. Add an entry in
/etc/fstab
for that LUN and use the
noauto
option so the entry is
skipped during boot time. For example:
/dev/disk/by-id/dm-uuid-mpath-23165353937623137 /mnt auto noauto
0 0
3. Add a script in
/etc/init.d
that waits until
multipathd
has detected the LUN and then
mounts the filesystem. See Script for Mounting the Filesystem below.
4. Make the system run during startup and shutdown. For example:
chkconfig mount-ion-filesystems on
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