On Fri, January 1, 2010 21:12, Stroller wrote:
> Hi there,
>
> Can anyone tell me if the drives on the PowerEdge 2650 were hot-swap
> as standard, please?
>
> This review <http://www.pcmag.com/article2/0,2817,31750,00.asp> says
> that:
>
>     "Featuring ... hot-swappable hard drives, redundant power
>     supplies...
>
>     An integrated PERC3/Di dual-channel RAID controller ... is
>     optional, or you can configure the 2650 with a choice of
>     two- or four-channel RAID cards or a dual-channel SCSI
>     adapter card. ... two redundant 500-watt power supplies are
>     standard, although you can opt for a single nonredundant
>     power supply."
>
>  From that it's not really clear to me whether or not hot-swap was a
> feature of all the possible RAID card choices, or just some of them.
>
> Does anyone know what chipset was used on the PERC3 & for the other
> RAID controller options? I'm assuming that RAID cards are the sort of
> thing that are still supported in the Linux kernel even when they're
> 5+ years old. Does that seem reasonable?
>
> There is one of these available locally to me, on eBay for (perhaps)
> not too much money, and it might just hep a scratch I have that needs
> itching. I appreciate the 2650 isn't a current model and requires
> Ultra3 SCSI drives, but neither performance nor storage capacity are
> an issue for this application.
>

Service manual
(http://support.dell.com/support/edocs/systems/pe2650/en/sm/index.htm)
says:

"Support for up to five 1-inch, internal Ultra3 SCSI hard drives (with
hot-plug capacity when using the optional ROMB card)."

The 3/Di ROMB was Adaptec, still supported in Linux by the aacraid driver.
 The 3/SC and 3/DC add-in cards were LSI, still supported by megaraid
driver. I run a 3/DC in my venerable Precision 530 home server on Fedora
12.

Haven't seen a 2650 with the internal drive backplane connected to a SC or
DC add-in, but the drives should also be hot-swappable in such a config. 
You just can't hot-swap if connected to vanilla SCSI.  BTW, Ultra3 is not
"required", just the practical speed limit for the PERC 3 generation.  You
can drop U320s in and they'll just step down to U160 speed.  Throw in an
Ultra2 and they'll all step down to that speed.

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