[CentOS] Re: Duplicate PV on HW RAID?

[Scott Silva]

on 7-29-2008 2:04 PM Eduardo Grosclaude spake the following:

On Tue, Jul 29, 2008 at 1:23 PM, Lanny Marcus <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote:

    Eduardo: To give you something else to consider, as an alternative:  I
    believe there was a long thread here, awhile back, about using
    Software RAID, instead of fake RAID controllers. Software RAID works
    very well, as I recall from reading that thread. Possibly look into


Yes, I finally ended up installing software RAID because

changing to Software RAID. Depends on the HW RAID controller. 1) I have read that, even if I installed the proper driver, Linux only uses it to configure its own dm software RAID device according to the BIOS conf-- is this completely true? If yes, no real offloading anything to hardware anyway-- even under Windows; does anybody know about this for sure?

Fakeraid doesn't really offload anything to hardware. Most of the drivers are just software raid hidden from the OS by programming "black magic". The bios just sets metadata or stores registers that the driver reads to know what to do. I believe that the linux MD raid drivers are much more robust and way more tested.

2) I am very scared by non-kernel-tree-blessed modules which have their own install procedures and/or updating schedule, I have been bitten by this in the past.

Join the club.

I finally did setup two 1-RAIDed identical partitions and installed the system on the rest of both disks... Now my system won't boot if one disk is broken, but I hope I can go rescue into the data. I was formerly hoping to rely on RAID to protect the full install and simplify my life, but I was discouraged away by 1) and 2).

Follow the software raid howto and you should be able to boot from the second drive if the first fails.

I have yet to see a real RAID controller... At what price do they start off?

I would guess at about $150 US (450 Argentine Pesos) for a 3ware 2 channel sata PCI raid card plus shipping and any local duties. Double that for 4 channels.

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