Re: load source concurrent maintenance

[lbolhuis@xxxxxxxxxx]

Joe,

  You are not SOL if D01 dies, only if it Dies and then you power off the 
system before you replace it.   D01 (like all the others) can be 
concurrently replaced and rebuilt with no loss of data or uptime. The 
'Gotcha' is that if D01 is dead and you power down you cannot IPL from 
that drive because it's dead.  Unless they've beefed up the logic in the 
RAID cards significantly then you would be stuck with a System reload at 
that point. 

  As a matter of practice we NEVER recommend powering down a system with 
ANY failed drives no matter which one it is unless that's the Only way to 
replace the drive. (Many older systems in the bottom end 270 and previous 
had this restriction.) 

  As to Mirroring your Load Source rather than RAID you can do that but it 
likely would require a reload. I can't swizzle out a routine that would 
let you start Mirroring on only the LS and it's mirror without mirroring 
all the rest of the drives. You'd have to resstore the LIC to just one 
drive, then add one more dirve to the system and start Mirroring. Once 
that's done then start RAID and after that add those four drives back in. 
Then complete the reload.

  I don't think it's worth it. 

     - Larry


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Joe Pluta <joepluta@xxxxxxxxxxxxxxxxx> 
Sent by: midrange-l-bounces@xxxxxxxxxxxx
06/16/2008 12:08 PM
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Re: load source concurrent maintenance






Thanks as always, Rob.

So I have this:

System Unit                      9406-270   FR01 
 Backplane                       283E       P19         DB1
  Disk Unit                *     6718-074   P06         D01
  Disk Unit                      6718-074   P08         D02
  Disk Unit                      6718-074   P11         D03
  Disk Unit                      6718-074   P10         D04
  Disk Unit                      6718-070   P09         D05
  Disk Unit                      6718-070   P20         D06

That's six drives in a RAID set.  Works nicely, everybody is happy.  But 
from the way I read Larry's statement, if D01 goes, I'm SOL.  Is the 
better option to somehow mirror two of them for the load source and then 
put the other four in a RAID set?  I'd lose one drive of effective 
space, or 20% of my total.  And can this even be done without some 
serious hoop jumping (i.e. reloading the system)?

Joe


> STRSST
> 1. Start a service tool 
> 7. Hardware service manager
> 1.  Packaging hardware resources (systems, frames, cards,...)
> 9=Hardware contained within package (On various items until you see 
> something like)
>                                 Type-    Resource 
> Description                     Model    Name       Location
> Disk Expansion Unit             5787-001 FR10 
>  Backplane                      505C     P144       P1 
>   Disk Unit                *    4328-070 P60        P1-D1 
> ...
> * - Indicates that this packaging hardware resource is the
>     load source disk unit or the IOP that the disk unit is
>     attached to. 
>
> Rob Berendt