Product manual

Galaxy G3G12 / G3G16 - Installation and Hardware Reference Manual
287 Section 9 Support
Why can a RAID 1 logical drive on Galaxy3G consist of only two disk drives?
On the Galaxy3G, RAID 1 logical drives work in mirrored physical drive pairs. You could create up to six
RAID 1 logical drives. Or you can create a single RAID 10 logical drive with data mirroring and up to 12
physical drives. If you have an odd number of drives but still want data mirroring, use RAID 1E.
See “Installing Disk Drives” and “Introduction to RAID” for more information on the number of physical
drives you can use for each RAID level.
Are logical drives on Galaxy3G limited to 2 TB?
No. But verify that your operating system and HBA supports logical drives over 2 TB. Also, for the
operating system to recognize the full capacity of logical drives over 2 TB, you must specify a sector
size of 1 KB or larger when you create the logical drive. See “Choosing Sector Size” for more
information.
I have two Galaxy HDX and use RAID Watch to monitor them. Can I use my existing RAID Watch
setup to monitor the Galaxy3Gs also?
No. Use the GAM embedded with the Galaxy3G
How can I be sure everything is working OK on the Galaxy3G?
Locally: The Galaxy3G enclosure has LEDs on the front to monitor the status of power, field replaceable
units (FRUs) and logical drives. When these are green, Galaxy3G is functioning normally.
Remotely: Check the Tree Icons in GAM. If there are no yellow or red warning icons displayed,
Galaxy3G is functioning normally.
What happens if a logical drive goes critical?
On the front of Galaxy3G, the logical drive LED turns amber and an audible alarm sounds. See “Critical
& Offline Disk Arrays”.
Can Galaxy3G run using just one power supply?
Yes, it is possible to run Galaxy3G on a single power supply. There are two power supplies so that
Galaxy3G will continue running if one of the power supplies fails. But deliberately leaving one power
supply off negates this advantage.
In addition, leaving one power supply off reduces air flow through the Galaxy3G enclosure and can
contribute to overheating. Always switch on both power supplies.