Analyzing The Disk Cache - Juniper MEDIA FLOW CONTROLLER 2.0.4 - ADMINISTRATOR S GUIDE AND CLI Administrator's Manual

Media Flow Controller Administrator's Guide

Analyzing the Disk Cache

When Media Flow Controller is having caching issues, you want to check the disk cache. To
analyze the media disk cache:
1. Get system-assigned disk names to use in configuration. Use list to view all disk drives,
their names, physical location, serial number, type, and capacity. Use cache_name to
view information on the specified cache.
show media-cache disk {list |<cache_name>}
show media-cache disk list
Example:
test-vos (config) # show media-cache disk list
show media-cache disk list
Device
------
dc_1
dc_2
Total Free Space:
test-vos-cl66 (config) # show media-cache disk dc_1
Disk Cache Configuration & Status:
Device Name/Type: dc_1/SATA
Cache Tier: Tier-3
Activated: yes
Cache Enabled: yes
Free Space: 2304 MiB
Disk State : cache running
-------------------------------------
2. Determine the free block thresholds of the disk caches.
show media-cache free-block threshold
3. Disable a disk if you need to pull the disk for any maintenance purposes; for example, to
upgrade to a higher capacity disk, replace a SATA disk with a SAS disk, replace a failed
disk, reformat the disk, or if contents should not be cached.
media-cache disk <cache_name> cache disable
4. Deactivate a disk cache. Media Flow Controller allows OIR (On-line Insertion and
Removal) of HDD (Hard Disk Drives). However,
removed. When a new HDD is in the disk, it must be made active and (if so decided)
enabled for caching.
media-cache disk <cache_name> status inactive
5. Put in a new drive and mount it.
media-cache disk mount-new
6. Find the new (inactive) disk's name.
show media-cache disk list
7. Activate or re-activate a media-cache disk.
media-cache disk <cache_name> status active
8. Format the disk if it is newly inserted and empty or you do not want to use its contents. Do
this after you issue the mount command.
media-cache disk <cache_name> format
Type Tier Active
---- ---- ------
SATA Tier-3 yes
SATA Tier-3 yes
107486 MiB
Media Flow Controller Configuration Tasks (CLI)
Cache Free Space
----- ----------
yes 38890 MiB
yes 68668 MiB
the HDD MUST be made inactive to be
Managing the Media Flow Controller Disk Cache (CLI)
State
-----
cache running
cache running
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