Question about Dell (PERC4/DC) (PERC4DC)

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Raid battery back up


I was wondering what a perc4 raid battery back up does?

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Re: Raid battery back up
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Re: Raid battery back up

The BBU stores the data that's not yet written to the disk in the write cache. If the power goes out, you don't lose your data.

Posted on Dec 11, 2007

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Raid configuration

That's probably because RAID 5 only tolerates 1 HD failure, (unless you have hot spares, in which case you can have many failures -provided only one fails at the same time...).

RAID 5 arrays can tolerate no more than one member drive failure.

Nov 08, 2013 | LSI Logic Storage Controllers

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Hi, within the previous 12hrs my e-series server bombed out - there are two issues (1) Memory DIMM malfunction (2) serveRAID-7k error 2807... I removed the faulty memory DIMMs, but the RAID error still...

You can recover RAID data from hard drive with RAID recovery software easily.
Tenorshare Data Recovery Enterprise is a comprehensive data recovery software that supports RAID recovery for RAID 0 and RAID 5. Lost data in RAID 0 and RAID 5 can be deeply scanned and restored immediately. Meanwhile, files and folders in RAID 0 and RAID 5 can be copied to other partitions directly.

Aug 29, 2011 | IBM ServeRAID-7k Controller (71p8642) SCSI...

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I have an Intek DG45ID motherboard, installed a Fasttrak TX4650 RAID card in the PCI-X x1 slot. The motherboard does not get past the BIOS post in the boot process, just after showing the boot options a...

It seems that the card might be faulty. If there were incompatibility problems, they would normally show up under the operating system (Windows, Linux, etc), not during the booting process.
From your description, I suspect that the card's BIOS is corrupt. Try getting a replacement under warranty and see if the new card works normally (it should).

Mar 13, 2011 | Promise FastTrak TX4650 4 Port SAS RAID...

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I have a usr8700 NAS running raid 5. I had a drive fail and now I cannot access any of the data. I am researching the options of recovering the data. I found a few products and service options but don't...

Hello, I don't know your particular NAS, but a raid 5 is able to survive a single drive failure and continue to supply data ok because it recreates it from the remaining drives plus the parity drive. But, if you then get a subsequent drive failing before you've replaced the original failed drive, (and restored the data to it, which is/should be automatic) then it's really bad news. So, if you definitely have only had a single failed drive then you should just get an alert to warn you to take remedial action- ie, replace the drive. If the NAS has stopped supplying data then you may have got a multiple-drive failure situation. Just a general note of caution when working on a raid array: Some raid systems are clever and you can switch your drives around, some aren't and you can 'break' these raid sets just by swapping the positions of 2 drives, which is too easy to do if they're not labelled and you're trying to faultfind unless you're absolutely certain, just label your drives (and take a photo) before starting to swap drives about. Anyway,good luck with your troubleshooting.

Dec 24, 2010 | U.S. Robotics SERIAL ATA 4DRIVE NAS...

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Set up raid 1 with win xp--------47JFR controller

load the software driver for this card
then open the window of this software by opening it from program files , you would see help on this soft ware . select raid 1, else is done auto .you must have minimum two drives to make a raid

Sep 12, 2009 | Dell 47JFR - (Refurbished)...

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1 logical harddisk degraded, RAID Poweredge

Revert back to original configuration of hdd in your RAID setup. Boot to SCIS BIOS and double check functionality of hard drives. The error is probably telling you that Disk1 is degraded because disk 0 is failing and you removed the wrong hard drive.

Jul 11, 2009 | Dell Storage Controllers

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Pci ide raid card problem

Could be a PSU problem. What wattage PSU do you have?

Jan 31, 2008 | Sabrent SBT-RDIT PCI IDE Silicon Image...

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How to make raid 10 with Tyan M7902?

Yes. Unless you're using HP-Ux's LVM or some other Logical Volume Management software package, the controller can only perform mirroring on the same channel. I see no value in running Raid 10... all it does is strip the mirrored data on the 2nd set of disks. It uses the same overhead as mirroring and offers minimal benefit with the potential for more overhead in slowed bandwidth. Make it simple and just mirror the drives with Raid 1.

Sep 05, 2007 | Tyan M7902 (m7902tarosodimm) SCSI...

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