PERC4-DI?

My company is looking at buying some machines with "PERC4-DI" SCSI RAID controllers. Poking around the .config file I'm not finding anything related to this. Anyone know off the top of their heads what driver would be used for this controller, any known catastrophic bugs, etc?

Thanks,
Robert

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Robert L. Harris | GPG Key ID: E344DA3B

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It seems that you're talking about a Dell server. So far I know PERC means PowerEdge Enhanced Raid Controller or something similar. Under the PERC you will find diff. Raid ctrl (Adaptec maybe Mylex) you may need to check wich kind of Raid Ctrl it is. One for sure PERC isn't a RAID Ctrl supplier.

Arsène

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Be very careful about the Dell PERC controllers. The 4-DI is *probably* a rebranded LSI megaraid, with Dell's firmware. You *definitely* want to subscribe to the [email protected] list. You well almost certainly have to recompile your kernel with an up to the minute version of the megaraid driver. Problems with the stock driver include server performance problems, crashes, inability to use clustering. Many users complain about the megamon utility, and have reverse engineered the firmware api and written their own utility to get around the problems. The source isn't available AFAIK. I don't think it will integrate with linux-ha heartbeat for clustering very well. Some people have tried flashing the LSI firmware to fix things.

I am afraid to use it in a database cluster without a *log* of time to debug. The EVMS clustering support is getting stable, I am currently in the testing phase for a postgresql cluster I am building with software raid/Adaptec SCSI controllers, and shared disk array.

Regards,

Jeremy Jackson

Jer Jackson <[email protected]>

If its anything like the PERC 3 cards, it could be anything from an LSI through to an Adaptec card. (PERC = PowerEdge Raid Controler).

I haven't found any major issues with any of them yet, but we don't tend to push them as hard as others here - we mainly use them in webservers.

Mark.