Which of the following opinions about S5000 version upgrade is wrong?

The subsequent releases of both S5000V1R5 and S5000TV1R1 can achieve a smooth upgrade, no need to upgrade the intermediate version
S5000TV1R1 upgrade to V1R5, need to upgrade to the V1R2 first, then upgrade to V1R5, directly from V1R1 upgrade to V1R5 may cause the DB loss, management port IP, log, license loss and other unusual problems
before upgrade, need to backup the DB, system configuration information and system log
before upgrade, don't have to check the version supporting table and manual of the version, because the system support version detection

Answer(s): D

RAID5 random write exist "punishment", which will influence the write performance, which of the following opinions are correct? (Select 3 Answers)

"punishment" is the extra read operation, which is caused by accomplishing write operation of IO
to complete an IO write operation, actually performed read and write operations for many times
"punishment" in random write operations is the key factor of influencing the performance
to complete an IO writes operation, actually perform read operation and write operation once

Answer(s): A,B,C