HP XP P9000 Command View Advanced Edition Software - Manual (Page 63)

Therefore, to execute the verification process in parallel and increase the performance, it is ideal to
increase the number of FC ports connecting the server and storage and provide a configuration to
enable multiple processing of I/O with respect to the disk.
The number of FC ports that can be mounted on one server is as follows:
number-of-FC-ports = number-of-FC-ports-per-HBA *
number-of-expansion-slots-that-can-be-used-to-mount-HBA
Estimating the number of backup servers
You can use the following procedure (a series of calculations) to estimate the required number of
backup servers necessary for efficient backup operations.
1. Collect/estimate values for all the parameters shown in Table 2 . For best results, collect the data
from your database server with the largest configuration.
2. Calculate the time necessary to back up a database using this formula:
DB_BACKUP_TIME = {( IS / IS_VERIFY ) * IS_NUM + ( LOG_NUM / LOG_VERIFY )} * SG_NUM
+ RESYNC_TIME
NOTE:
Be aware of the following:
• When comparing the backup time required per database server to the total time required
by the system to perform backup processing, use the backup time required for the largest
database server in the configuration.
• Because the variables IS_VERIFY and LOG_VERIFY are highly dependent on server
and storage I/O performance, use the actual performance of the equipment to verify
the backup time.
3. Compare the time allowed for the backup process with the time required to back up a database
server:
• If the SYSTEM_BACKUP_TIME value is less than or equal to the DB_BACKUP_TIME value,
decrease the number of storage groups and/or information stores per database server and
repeat the calculation in step 2.
• If the
SYSTEM_BACKUP_TIME
value is greater than the
DB_BACKUP_TIME
value, calculate
the number of backup servers using the following formula:
BK_SERVER = DB_SERVER / VERIFY_PARA
Round this value to the nearest whole number.
Table 2 Parameters for backup server calculations
Notes Description Parameter
You must supply this value.
Size of a the database file per inform-
ation store to be backed up (MB)
IS
You must supply this value.
Number of transaction log files per
storage group to be backed up
LOG_NUM
User Guide 63