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6 Configuration Sun Microsystems, Inc.
root@thumper1 # zpool list
NAME SIZE USED AVAIL CAP HEALTH ALTROOT
nbupool 18.1T 58.6G 18.1T 0% ONLINE -
The size listed in the above command is the actual physical space in the pool. This may differ from the actual space
data may occupy as various RAIDZ methods and configurations are not taken into account. See the zpool(1M) man page
for more details.
ZFS Configuration
In this example, the X4500 Media Server is configured to write to Basic Disk Storage Units. Each Storage Unit is created
from a ZFS filesystem mountpoint. The number of filesystems needed will be a implementation by implementation
decision but a few factors should be considered.
• Number of Backup/Recover streams needed
• Number of duplication or stage operations needed
• Number of Tape Drives configured for duplication or stage operations
In this example, 4 backup filesystems are created (/backup1, /backup2, /backup3, /backup4). Testing has shown that
creating a single ZFS filesystem for all backup streams is a bottleneck that limits the throughput to 200-250MB/sec.
Using multiple filesystems in parallel eliminates that bottleneck.
Example ZFS filesytem creation script:
#!/bin/bash
for fs in 1 2 3 4
do
zfs create -o mountpoint=/backup$fs nbupool/backup$fs
done
root@thumper1 # zfs list
NAME USED AVAIL REFER MOUNTPOINT
nbupool 46.8G 14.2T 39.1K /nbupool
nbupool/backup1 14.8G 14.2T 14.8G /backup1
nbupool/backup2 10.8G 14.2T 10.8G /backup2
nbupool/backup3 5.38G 14.2T 5.38G /backup3
nbupool/backup4 15.8G 14.2T 15.8G /backup4