On Fri, 17 Jan 2003, Orlando Andico wrote: > I have an external Promise RM8000 array here. This has 8 bays for IDE hard > drives. It has an Ultra-SCSI connector so one can connect it to just about > anything. The whole array looks like a single drive. > > Here's my problem: I have an 8x 160GB RAID array (6x160GB = 960GB, one > disk for parity and another for hot-spare). Since the array emulates a > single SCSI device, the host OS sees it as a single 960GB (!) hard disk. > > Here's the problem: when labeling the "disk" you have to assign a certain > C/H/S. With a drive that large, the Promise would do something like > > C = 125320 > H = 255 > S = 63 > > (that's 125320 cylinders, 255 heads, 63 sectors/track, 512 bytes/sector) > > I'm not sure if Linux can handle that many cylinders!! definitely Solaris > 8 doesn't like >27 heads or >255 sectors/track. > > Bottom line: I can't squeeze the full capacity out of the array because > the OS don't support it!
Orly, For Solaris 2.6, the maximum is C=32767, H=64,S=256. Probably the same with Solaris 7 or 8. You might want to call SUN support if it has indeed been changed or maybe they have patches to Solaris format or whatever to support large logical drives. Well you have 2 options, I dunno if this will help you since i'm not familliar with the product Promise RM8000. 1. Create additional LUNS. If you can create 4 LUNS, then you have four logical HDD at 240Gb each. Then concat/stripe/mirror or whatever the 4 logical HDD using disksuite or Veritas Volume manager. Can the RM8000 even do that? 2. Configure the array in JBOD mode so you will see 8 scsi hard drives (in theory!) and let disksuite or Veritas Volume Manager manage the disks. From SDS or VVM, you can configure the HDD for hot-spare etc. regards, --- Andre M. Varon, SCSA http://andre.lasaltech.com _ Philippine Linux Users Group. Web site and archives at http://plug.linux.org.ph To leave: send "unsubscribe" in the body to [EMAIL PROTECTED] Fully Searchable Archives With Friendly Web Interface at http://marc.free.net.ph To subscribe to the Linux Newbies' List: send "subscribe" in the body to [EMAIL PROTECTED]
