I wonder then if the SCSI card that doesn't work has a fixed IO address that happens to fall within a memory address above 2 gig and you start having problems when ever that space is touched. I am just totally shooting in the dark, but it may be just that. On 7/16/07, Steven Wagner wrote: > > Shawn Badger wrote: > > I am guessing it may be some bad memory. I know that CentSO can > > support much more than 4 Gig of memory. Get something like the system > > rescue cd and do a memory test to see if it makes it through. > > > > Also, remove the old 2 gig of memory and see if it works in that > > configuration. If it does, then you may even try to mix and match the > > chips. It is possible they sent you the wrong memory. > When we install CentOS to a SATA drive everything works fine and it sees > all 4 GB RAM and there aren't any problems. I think it's the SCSI card. > The card in the broken server is an Adaptec 2940W/2940UW. I found out > tonight that this same client has another server with us that is running > CentOS with 4 GB RAM, but the SCSI card in that system is an Adaptec > 2940UW. hmmmm... I asked her if she could afford the downtime (15-20 > minutes) for me to borrow that card and swap with the one in the broken > server. I'm still waiting to hear back on that. > > At this point I am 98.9% sure it's something to do with the SCSI card. > Still, it's kind of weird that that card and those drives work perfectly > with 2 GB RAM, no? Maybe a firmware issue with the drives? Or the card? > > > > > > > > On 7/15/07, *Steven Wagner* > > wrote: > > > > Technomage-hawke wrote: > > > this may be a linux specific problem (I cannot be sure unless > > the results can > > > be duplicated with other linux distros). > > > > > > perhaps trying openBSD or OpenSolaris would work (fully > > supported for that > > > much ram and that hardware). > > > > > I've tried FreeBSD (and several other Linux distros) and it didn't > > even > > see the drives. I'm pretty sure that the problem is the card, but > it's > > still odd that it works fine with 2 GB RAM. Also, CentOS worked fine > > with the SATA drive and all 4 GB RAM. > > > > > > > > > TMH > > > > > > On Sunday 15 July 2007 21:57, Steven Wagner wrote: > > > > > >> I'm trying to upgrade a server from 2 GB of registered ECC RAM > > to 4 GB. > > >> The extra RAM was specifically purchased from the manufacturer > > to be > > >> identical to the existing modules. After installing the extra > > RAM the > > >> server panic'ed so we tried installing some other kernels, even > > enabling > > >> huge mem (64 bit) to no avail. > > >> > > >> I rebuilt the server with CentOS 4.4 Server CD with all 4 GB of > RAM > > >> installed. It panics when I try to boot with the full 4 GB > > installed, > > >> but boots fine when I remove 2 GB. > > >> > > >> The panic seems to happen when the SCSI card driver, aic7xxx, > > tries to > > >> enable the disc drives. The console error says: > > >> > > >> aic7xxx_dump returns 0x2002 > > >> Device offlined > > >> > > >> then a slew of SCSI I/O errors, the exec of init failed, then > > the panic. > > >> It seems weird that the card and the drives work fine with the > > 2 GB of > > >> RAM...Anybody have any thoughts? > > >> > > >> TIA, > > >> > > >> Steve > > >> > > >> BTW, I installed CentOS 4.4 on this machine to a SATA drive and > > it sees > > >> all 4 GBs and works fine. > > >> --------------------------------------------------- > > >> PLUG-discuss mailing list - > > PLUG-discuss@lists.plug.phoenix.az.us > > > > >> To subscribe, unsubscribe, or to change your mail settings: > > >> http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > > >> > > > --------------------------------------------------- > > > PLUG-discuss mailing list - > > PLUG-discuss@lists.plug.phoenix.az.us > > > > > To subscribe, unsubscribe, or to change your mail settings: > > > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > > > > > > > > > > --------------------------------------------------- > > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > > > > To subscribe, unsubscribe, or to change your mail settings: > > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > > > > > > > > ------------------------------------------------------------------------ > > > > --------------------------------------------------- > > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > > To subscribe, unsubscribe, or to change your mail settings: > > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us > To subscribe, unsubscribe, or to change your mail settings: > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss >