Re: Disk Layout and mirroring in 7.x

Don't do "OS" mirroring. Use your disk sub-system software. (Veritas, Vol Mgr, Clariion Manager, etc.) If the disks are set up in RAID/1 (hardware mirror), you disk subsystem SHOULD know to read from BOTH disks. (I've used the Clariions on D/G machines and they are extremely fast and very robust) As for your other point, add the second 2Gb partition as a "chunk" to your original DB space. The limitation in on CHUNKS not on DBSPACES. And yes, some of the newer RAID offerings are almost as fast as multiple, single-spindle fragmentation schemes. I still prefer, however, the control that single-spindle layouts give you. Dave Otto Sr. Database Administrator The Money Store require 'sys/std_disclaimer.ph'; ################################## Jeff Kalchik wrote in message <34b4f069.1386472468@news.usr.com>... >Just for assorted giggles, have you (Erik) looked at some of HP's RAID >offerings? I'd suspect Mirror/UX (OS mirroring software) to be >roughly comparable to Informix mirroring. I've got a Model 20 array >(relabeled Data General Clariion) here that I'm going to be loading up >around 10 gigabytes, on 2 F/W differential channels. You may also >want to consider the HP AutoRAID box, but I don't have any direct >knowledge of that beast. > >One of the downsides I've discovered with Informix is the inability to >use a volume past the 2 gigabyte mark. Fortunately, I should be able >to use the 2 gb modules for most of this. If I were using 4 gb disks, >I'd have to use LVM to allow Informix to access the entire disk, >instead of half. I'd like to get around this restriction, but I >haven't figured it out yet. > > >Jeff Kalchik > >---------------------------------------- >Views expressed are my own, not necessarily >3COM's.