Re: 5.1.21 Dell 2950 terrible swraid5 I/O performance with swraid on top of Perc 5/i raid0/jbod

[Marc MERLIN <marc@merlins.org>]

On Mon, Aug 19, 2019 at 06:42:23AM -0500, o1bigtenor wrote:
> On Mon, Aug 19, 2019 at 2:35 AM Marc MERLIN <marc@merlins.org> wrote:
> >
> > (Please Cc me on replies so that I can see them more quickly)
> >
> > Dear Block Folks,
> >
> > I just inherited a Dell 2950 with a Perc 5/i.
> > I really don't want to use that Perc 5/i card, but from all the reading
> > I did, there is no IT/unraid mode for it, so I was stuck setting the 6
> > 2TB drives as 6 independent raid0 drives using the card.
> > I wish I could just bypass the card and connect the drives directly to a
> > sata card, but the case and backplane do not seem to make this possible.
> 
> Not to discourage you from a possibly interesting and fruitful endeavor
> but when I bought myself a slightly newer dell server I traded out the
> PERC card for a newer version (model 700 IIRC) and then I things
> were quite a big different. Said board, bought used, wasn't very
> expensive. YMMV

Thanks for that suggestion. Indeed, I'd like nothing more than to get rid of
that Perc 5/i card, even if it can't be as bad as what I'm seeing.
That said, from some reading, an H700 isn't just a swap in replacement, it
doesn't use the same cables from what I can tell.

https://www.serversupply.com/products/part_search/pid_lookup.asp?pid=312363&gclid=CjwKCAjwkenqBRBgEiwA-bZVtsIuJabv8vB5F8teo0XxgozYWxwNCS7N5Ar1fVQjvaBkRsQtelRlBhoC3f0QAvD_BwE
Perc 6/i does use the same cables, but it's barely a better card than 5/i
https://www.newegg.com/p/14G-000T-001F5?item=9SIA9AX8NB4437&source=region&nm_mc=knc-googlemkp-pc&cm_mmc=knc-googlemkp-pc-_-pla-splus+technologies-_-hard+drive+controllers+%2f+raid+cards-_-9SIA9AX8NB4437&gclid=CjwKCAjwkenqBRBgEiwA-bZVtnNFqB4fWVPzKkZn_utZwhgYrnBDyKRrafTgRdX2AlHK9NiXr4sxGxoCDqgQAvD_BwE&gclsrc=aw.ds

Best,
Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/