Why RAID Controllers Have Batteries in india

Why RAID Controllers Have Batteries in india

Are your RAID controller lithium-ion batteries ticking time bombs in your server’s? This past weekend we witnessed an IBM ServeRAID battery package that looked very serious. RAID controller batteries must be changed at regular intervals, as everyone knows. This is one of the main drivers for supercapacitors in RAID cards. We had assumed that it was about keeping data safe in case of power loss. We now believe it might be a safety concern after this weekend.Buy Low price Raid-batteries online in india, Shop all kind of Refurbished IT spare parts online

Background: Why RAID Controllers Need Batteries

Today, most RAID controllers are SAS-based (or specifically SAS3). Marvell offers SATA III RAID 0 and 1 at a low price, but these are more suitable for simple NAS units or boot drives. To determine what data to write to each device for parity RAID levels like RAID 5 or RAID 6, the controller must perform XOR calculations whenever data is written to an array. Modern processor standards make this a simple calculation, even though it takes some time, even with 8x10TB hard drives.

Companies that make RAID controllers have been solving the problem of improving write performance for many generations by using DRAM. The RAID controller can be written to by the host system. These data are temporarily stored in DRAM until parity calculations can be flushed to the disk.

The basics of data storage

This is a great article. It is focused on ZFS write cache, but it is conceptually similar to writing back cache on RAID controllers. In these cases you would normally have a battery backup unit (BBU). The BBU allows the RAID controller to keep data in DRAM onboard for several hours in case of power failure.

RAID controllers equipped with BBUs are well-known and have been in use for many years by those working in the RAID industry or on operations teams that have RAID cards deployed. As a result of a possible loss in battery capacity, it is important to replace the BBUs regularly. We saw another reason to change batteries this weekend.

The RAID Controller Battery Time Bomb was Discovered

We had a major lab refresh this weekend, as we have 12kW more servers inbound or just arriving. It was time to get rid of any Intel Xeon E5-2600V1/ V2 generation servers. While most data centers do this already, we keep them in the lab for backtesting purposes. These servers are kept offline and are often forgotten until the need arises for back-testing a benchmark on an older CPU.

One of the servers was being prepared for its final retirement. This server was a 2011/2012 era and had an IBM ServeRAID 5014 RAID controller, the (Broadcom LSI SAS 2208 RAID controller) inside. The server was powered off after the Intel Xeon E5-2600V3 Haswell-EP launch. This is except for a quarterly benchmarking run. The RAID controller was not used as our benchmarking system is a SATA drive directly attached. Although it was physically stored in the server, we hadn’t used the IBM M5014 for many years. The RAID controller, specifically, the LSI battery pack LSI BAT1S1P, was pulled from the LSIiBBU08 kit. It looked completely different.

LSI BBU on IBM ServeRAID 5014 Seven years Later

LSI BBU on IBM ServeRAID 5014 Seven years Later

The sticker was removed and revealed a large bulge beneath. Over the years, the battery pack has become distorted

LSI BBU on IBM ServeRAID M5014 Batteries Bubble

LSI BBU on IBM ServeRAID M5014 Batteries Bubble

They were very popular. They were used for IBM ServeRAID cards such as the M5014 and M5015 with higher memory. They were also used in almost every LSI SAS9200 series RAID controller with internal memory. These cards included the LSI SAS 9260-8i and 9261-81 cards, as well as numerous OEM versions.

The LSIiBBU08 was the lithium polymer version. However, the LSIiBBU07 is the lithium-ion version with a 1-year replacement period. Both kits have reached the point where their controllers no longer serve any purpose. SAS2 was PCIe 2.0-only and meant for hard drive environments. Our battery was still manufactured in 2011, and many companies have Sandy Bridge and Ivy Bridge generation Intel Xeon E5-2600V1/ V2 servers. There is a good possibility that others on the field will have the same battery.

Last words

Everybody likes to feel that their products have been properly used and maintained. There is extra maintenance that must be done for RAID controllers with battery backup units. Servers that are expected to last for 36 months will not need this maintenance. Many organizations have servers that are well over three years old. If you are using traditional RAID cards for those servers, make sure you have a plan for regularly replacing batteries. You cannot just stop using the BBU feature to protect against power loss. Bulging batteries could lead to more serious failures of a variety of devices. A server battery not bursting is not something you want.

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