LSI RAID controller memory size: 512 or 1024 M ?

As documentation says the LSI MegaRAID in storage cell has 512M of cache memory for write-back cache and read ahead.  This was true for X2,X3,X4 Exadatas. 
But in X5 storage cells Oracle silently improved RAID model and now it has 1024M of memory for cache and read ahead.
Old model was LSI MegaRAID 9261-8i, new is LSI MegaRAID 9361-8i.

Look to exachk output in the c_cwc_cell_raid_controller_version_report.out  file.

----------------------------------------------
New configuration (X5):

                    Versions
                ================
Product Name    : LSI MegaRAID 9361-8i
Serial No       : ...
FW Package Build: 24.3.0-0073

                HW Configuration
                ================
SAS Address      : 500605b0099c7e60
BBU              : Present
Alarm            : Present
NVRAM            : Present
Serial Debugger  : Present
Memory           : Present
Flash            : Present
Memory Size      : 1024MB
TPM              : Absent
On board Expander: Absent
Upgrade Key      : Absent
----------------------------------------------

Old config (our X4-2)

                    Versions
                ================
Product Name    : LSI MegaRAID SAS 9261-8i
Serial No       : ...
FW Package Build: 12.12.0-0178

                HW Configuration
                ================
SAS Address      : 500605b0073e9120
BBU              : Present
Alarm            : Present
NVRAM            : Present
Serial Debugger  : Present
Memory           : Present
Flash            : Present
Memory Size      : 512MB
TPM              : Absent
On board Expander: Absent
Upgrade Key      : Absent
----------------------------------------------

Leap Second

New trouble with this time ...

Now the earth is spinning smoothly, and therefore

after    June 30, 2015 23:59:59

become   June 30, 2015 23:59:60

not a    July 01, 2015 at 00:00:00

Encyclopedia for this problem:

http://matheusdba.com.br/2015/05/31/leap-second-impact-for-oracle-database-june-30-2015-at-235959/?utm_content=buffera3eff&utm_medium=social&utm_source=linkedin.com&utm_campaign=buffer

 

Учебник Дэвида Харриса и Сары Харрис «Цифровая схемотехника и архитектура компьютера»

Полезная для общего развития книга: http://panchul.livejournal.com/469643.html