Re: IDS 11.5 and SDS
On Jan 28, 12:01 pm, TBP <th...@Usenet-News.Net> wrote: > TBP wrote: > > Tom wrote: > >> On Jan 28, 10:14 am, TBP <th...@Usenet-News.Net> wrote: > >>> Tom wrote: > >>>> Greetings All, > >>>> Has anyone configured IDS 11.5 with SDS on any AIX platforms? I am > >>>> configuring two new servers and plan on using IDS 11.5 features for HA > >>>> and it looks like a Shared Disk Secondary would fit the bill. However, > >>>> a call to IBM Informix as well as IBM AIX Software group provided no > >>>> info on how to configure AIX using raw LV's to meet the "Shared" disk > >>>> requirement for SDS to work. > >>>> The two servers are identical P6-550's connected via SAN to an IBM > >>>> 2105-800. The IDS is 11.5.FC3. > >>>> Thanks, > >>>> Tom > >>> I can think of no "requirements" as such, only that both hosts can > >>> see the raw lvs (obviously) with the same paths. > > >>> What requirements are you referring to?- Hide quoted text - > > >>> - Show quoted text - > > >> The documentation as well as the Informix tech I spoke with call for > >> "Shared" disks. The option to create Shared VG's and Shared LV's does > >> not exists (that I know of) outside of HACMP, which is what I use now. > >> Due to the cost of HACMP and the new inherent HA options in IDS 11.5 I > >> want to get away from using HACMP. The end result needs to allow more > >> than one system to access a given LV at the same time. How do I create > >> such a VG and LV outside of HACMP? > > >> The GPFS product looks like it would allow for exactly this type of > >> access, but under cooked files only (the GPFS tech support joined in > >> on the AIX team trouble call) but this is a purchase feature, which > >> again adds unwanted cost to the project. The RSCT package comes with > >> AIX and appears to allow for such a configuration, but reading through > >> the manuals on RSCT this looks like a huge undertaking, creating RSCT > >> peer groups and whatnot, and I was hoping for a simpler solution. > > >> So, back to my original question. Has anyone configured IDS SDS > >> servers using AIX and raw disk space? > > >> Tom > > > i.e. You want to know how AIX can share raw lvs between hosts. > > > Ask AIX :D > > PSSP V3.5 for AIX - looks like it can share logical volumes (raw) - not sure if it is a cost option or not :-/ > > However, trying to find ANYTHING about this seems impossible.- Hide quoted text - > > - Show quoted text - PSSP - I remember that from the days of RS/6000 SP nodes. Is that technology still current?
Tom, you need to map your LUN's on ESS to two (or more?) hosts, but after reading the following redbook http://www.redbooks.ibm.com/abstracts/sg246424.html it's hard to tell if it can be done in your case, using Fiber Channel SAN connection. Chapter 4.30.4 explicitly states it's possible with SCSI interface (at the expense of performance though), but chapter 4.31 doesn't go much beyond configuring LUN's only for one host. HTH (a bit) Cheers Davorin