Carat BBU-MODULE-04 Handleiding

Carat Accu BBU-MODULE-04

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LSI™ MegaRAID® LSIiBBU08

Intelligent Battery Backup Unit for 6Gb/s MegaRAID

SAS Controller Cards

Product Brief

K E Y F E A T U R E S

Helps protects integrity of cache in

the event of power or server failure

Higher maximum ambient tempera-

ture tolerance than previous genera-

tion battery backup units

Multiple modes of operation and

retention times

Transparent and shorter learning

cycles

For use on all existing 6Gb/s

MegaRAID controllers

Customize mounting location in

chassis with remote mounting

options

Higher Ambient Temperature Toler-

ances and Increase Serviceability

The LSIiBBU08 can tolerate higher ambi-

ent temperatures around the battery

backup unit as compared to the previ-

ous generation battery, with tolerances

of up to 55°C versus 45°C for ambient

cell temperature. There is also a remote

mount option available which allows

customers who have limited chassis

space or a constrained thermal environ-

ment to reposition the battery backup

unit away from the RAID controller card

for cooling purposes.

A lower temperature environment will

generally help prolong the service life of

a battery backup unit, while high tem-

peratures and extreme conditions will

shorten the battery life. For example, if

the battery is set to a 12-hour DRT and

45°C mode, it may not require replace-

ment for the life of the RAID controller1.

However, using a 48-hour DRT and 55°C

mode with your battery may cause a

situation where the battery requires

replacement after the rst year of use2.

Multiple modes of operation and

retention time

The LSIiBBU08 allows for multiple

modes of operation, which let the user

select a shut-o data retention time

(DRT) of 12, 24, or 48 hours with as-

sociated operating temperatures, learn

cycles, and estimated service lives. The

MegaRAID controller rmware will use

the LSIiBBU08 until it calculates that

the battery can only guarantee cache

data for the selected period of time in

the event of power loss to the server.

With previous generation MegaRAID

batteries, there was only one mode of

operation with a retention time of 72

hours. By oering these multiple modes

of operation, the LSIiBBU08 provides the

exibility to select the optimum DRT,

performance based on cache policy, and

maximum operating temperature that

best ts their specic application and

environment.

L S I i B B U 0 8 M O D E

M O D E

5L S I i B B U 0 7

Data Retention

Time (DRT) 2

12 Hrs 12 Hrs 24 Hrs 48 Hrs 48 Hrs 72 Hrs

Transparent Learn

Cycle

√ √ √

Op Temp

(Charging Temp)

45oC 55oC 45oC 45oC 55oC 45oC

Estimated service

life3

5 years 3 years 3 years 3 years 1 years 1 year

1. Life of the controller is estimated at three years based on

standard warranty

2. Estimated Calculation based on; 1GB (5 chips) DDR2 and one

1500 mAh Lithium ion cell, individual results may vary.

3. Based on internal calculations regarding estimated battery life

and losses over time, individual results may vary.

Note: BBU warranty is still one year for all modes of operation.

LSIiBBU08

LSI, LSI and Design logo, CacheCade, FastPath, MegaRAID, MegaRAID Storage Manager, and SSD Guard are trademarks or registered trade-

marks of LSI Corporation. All other brand and product names may be trademarks of their respective companies.

LSI Corporation reserves the right to make changes to any products and services herein at any time without notice. LSI does not assume

any responsibility or liability arising out of the application or use of any product or service described herein, except as expressly agreed to

in writing by LSI; nor does the purchase, lease, or use of a product or service from LSI convey a license under any patent rights, copyrights,

trademark rights, or any other of the intellectual property rights of LSI or of third parties.

August 2010

For more information and sales oce locations, please visit the LSI web sites at: lsi.com

Transparent and Shorter Learn Cycles

The battery learn cycle is the process where MegaRAID rmware recalibrates the bat-

tery gas gauge with respect to the battery’s chemical capacity so that controller can

decide whether or not the battery can maintain the controller cache for the selected

period of time (DRT) in the event of a power failure. The battery learn cycle partially

discharges and then fully charges the battery backup unit.

With the LSIiBBU08, if the user requests a limited DRT of 12 or 24 hours, the controller

will continue to work in write-back mode during the discharge and recharge learn cy-

cle. In the event of a power failure during this learn cycle, the controller is designed

to accommodate that there is still enough energy left in the battery to provide the

selected retention time (12 or 24 hours). Because the learn cycles can be performed

as needed by the BBU without impact to the write cache policy or performance, this

is called a transparent learn cycle.

During the learn cycle in 48-hour DRT modes, the controller is forced to a write-

through cache policy for the duration of the discharge/recharge process, as the

Relative State of Charge crosses the boundary where the stated retention time can-

not be maintained. This cache policy writes the data directly to the disk and helps

protect against data loss during a potential power loss. While this is similar to the

existing learn cycle process for the LSIiBBU07 with a 72 hour DRT, it does allow for

much shorter learn cycles. Typically, the LSIiBBU08 only takes 3-4 hours to discharge

and recharge the battery to capacity, versus an 8-10 hour process required with the

LSIiBBU07 due to periodic deep discharges.

L S I i B B U 0 8

M O D E 1 , 2 , 3

L E A R N C Y C L E

L S I i B B U 0 8

M O D E 4 & 5

L E A R N C Y C L E

L S I i B B U 0 7

L E A R N C Y C L E

WB WT

Cache Policy — Yes Yes

Discharging Yes (37%) Yes (37%) Yes (90%)

Relaxation Yes Yes Yes

Charging Yes (37%) Yes (37%) Yes (90%)

WT WB

Cache Policy — Yes Yes

NO CHANGE TO CACHE POLIC Y

3 - 4 HOUR LEARN CYCLE

3 - 4 HOUR

LEARN CYCLE

8 - 10 HOUR

LEARN CYCLE

Product specificaties

Merk:	Carat
Categorie:	Accu
Model:	BBU-MODULE-04
Kleur van het product:	Meerkleurig
Gewicht:	- g
Capaciteit van de accu/batterij:	1500 mAh
Vormfactor:	PCI slot
Inclusief AC-adapter:	Nee
Accu/Batterij voltage:	- V
Levensduur batterij/accu:	3 jaar
Aantal per verpakking:	1 stuk(s)
Accu/Batterij oplaadtijd:	4 uur
Intern:	Ja
Compatibele producten:	3ware 9690SA/9650SE/9590SE/9550SX(U)
Aantal inbegrepen batterijen:	1 stuk(s)
Afmetingen (B x D x H):	- mm
Bedrijfstemperatuur (T-T):	0 - 45 °C
Aantal batterijcellen:	1
Fabrikant:	LSI