2. Notes and Cautions When Using This Product
Notes When Connecting Tape Devices
Notes and Cautions When Using This Product
13
Notes When Connecting Tape Devices
Because the tape alias setting uses the serial number of the drive/changer, if the drive/changer is
replaced, the tape alias must be set again on the ETERNUS AX/AC/HX.
Notes and Cautions for SSDs
Notes on Using SSDs
SSDs have reserved spaces to handle stress on SSDs, which increases as the number of write opera-
tions on NAND blocks increases. These reserved spaces are also used for garbage collection to
aggregate discrete data. The reserved space may decrease depending on the amount of write
operations, so a decline in write performance and a delay in response may occur.
The ETERNUS AX/AC/HX constantly monitors the components life and performance, and performs
preventive maintenance (Redundant Copy) before the SSDs affect operations.
Cautions When Storing SSDs for an Extended Period of Time
If SSDs installed in the ETERNUS AX/AC/HX are left without power for 12 weeks or longer, they may
lose data or become unusable. This is due to the characteristics of the NAND storage media.
To store SSDs without power for an extended period of time, perform the following actions.
• Back up the data if the SSDs are to be stored for at least 14 days.
Backing up the current data to another area is recommended just before turning off the ETER-
NUS AX/AC/HX.
• Turn on the ETERNUS AX/AC/HX and provide the SSDs with power for at least 10 days before 10
weeks pass since the SSDs had no power.
• Delete all data before storing the SSDs for at least one month.
To store SSDs for an extended period of time and then reuse them without using their data, delete
the RAID groups that are configured with those SSDs and then delete the data before cutting the
power.
To reuse the SSDs that have been stored without power for an extended period of time, make sure
to turn on the power when there is enough time to restore the backup data or to replace parts if the
SSDs are unusable.
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