Rodrigo, as always A BIG THANKS!!!!!!!! On 9/14/06, Rodrigo Barbosa <rodrigob at darkover.org> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Note: There IS an authoritative answer on this e-mail. Be patient with > me, please :) > > On Wed, Sep 13, 2006 at 11:14:20PM -0500, Erick Perez wrote: > > Does Centos/RHEL 4.4 supports the CERC 6-Channel SATA RAID Controller > > that comes with the Dell PowerEdge 830 Tower Server? > > CERC meaning "Cost Effective Raid Controller", which doesn't bode well. > > According to Dell[1]: > > [QUOTE] > CERC SATA 2S > > The CERC SATA 2S RAID controller is a combination BIOS and driver-based > software RAID solution, which uses the system motherboard's SATA controllers. > It is not a hardware RAID solution such as the aacraid and megaraid > controllers listed above. > > Systems with this controller include the PowerEdge 800, SC1425, and 420SC. > > Under Windows and Netware, there are special device drivers which operate in > conjunction with the system BIOS to present the system SATA disks as a RAID > volume. > > Under Linux, the disks should be treated as two independent disks, which use > the standard Linux "MD" software RAID layer for RAID 0 or 1 operation (if > you so desire). System Documentation on support.dell.com[2] describe how to > configure the system BIOS to either disable the RAID mode, or to set up the > disks as two independent RAID volumes (effectively disabling the BIOS software > RAID feature). > [/QUOTE] > > Notice: "It is not a hardware RAID solution". Also notice this might not > be the controller you have. > > On the other hand, some people claim otherwise[3]: > "I did some digging this AM and everything points to it being a MegaRAID > SATA 150-6 card (...)" > > You might also take a look, subcribe or ask questions on the > linux-poweredge mailing list[4]. That might be the best place to > get help on this issue. > This[5] particular post seems promising. > > This last page[6] seems to indicate that it is really a magaraid-like > controller, even providing a software to monitor it. > > Of course all of that is very instructive, but doesn't give you an > authoritative answer. Where should we look for that ? The kernel source, > of course ("Use the source, Luke!"). > > The file drivers/scsi/aacraid/linit.c can be very instrutive on this particular > case. On line 136 (or thereabout), you will find: > > { 0x9005, 0x0285, 0x1028, 0x0291, 0, 0, 38 }, /* CERC SATA RAID 2 PCI SATA 6ch (DellCorsair) */ > > And on line 211 (or thereabout): > > { aac_rx_init, "aacraid", "DELL ", "CERC SR2 ", 1 }, /* CERC SATA RAID 2 PCI SATA 6ch (DellCorsair) */ > > So we have a CERC SATA RAID with 6 channels from Dell, which really > looks like the one you are talking about. It gets identified as CERC SR2, > and is supported bu the aacraid driver. The only question left is, does > this support exists out of the box on CentOS (4.4) ? Lets ask the module, > of course. On /lib/modules/2.6.9-42.0.2.EL/kernel/drivers/scsi/aacraid, we > can check it: > > # strings aacraid.ko | grep CERC > CERC SR2 > > There you go. Sorry for taking so much space to answer your question, > but I'm hoping you can use my reasoning here for other things as well. > > References: > 1 - http://linux.dell.com/storage.shtml > 2 - http://support.dell.com/support/edocs/systems/SC1425/en/index.htm > 3 - http://www.linuxquestions.org/questions/showthread.php?t=336615 > 4 - http://lists.us.dell.com/pipermail/linux-poweredge/ > 5 - http://marc.theaimsgroup.com/?l=linux-poweredge&m=112783948009432&w=2 > 6 - http://www.deadcat.net/search.php?action=browse§ionid=16 > > - -- > Rodrigo Barbosa > "Quid quid Latine dictum sit, altum viditur" > "Be excellent to each other ..." - Bill & Ted (Wyld Stallyns) > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.5 (GNU/Linux) > > iD8DBQFFCPdCpdyWzQ5b5ckRArIYAKCMysqAAtOhdishfib8HrTA1KgV4ACfTy9D > a/oji5HnOy8dmgL/8MhnuyY= > =obcj > -----END PGP SIGNATURE----- > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- ------------------------------------------------------------ Erick Perez Panama Sistemas Integradores de Telefonia IP y Soluciones Para Centros de Datos Panama, Republica de Panama Cel Panama. +(507) 6694-4780 ------------------------------------------------------------