Hi Folks,
Thank you very much for the responses. I got many many replies in
a very short time and the responses were execellent as always.
Basically the responses said I would have no problem
with size limitation using a KZPSA. The limitation problem would be with a
SWXCR controller and not an HSZ controller. Also, even with the 32G
restriction with the SWXCR, I can make multiple 32 GIG raid sets and
then combine them with ADVFS.
Here are some of the responses... thank you again for the info...
Original question follows...
.
.
.
Since you mention
a KZPSA, I assume it's one of the HSZ family (HSZ40, HSZ50, HSZ70...) If
so, you shouldn't have a problem going over 32G. But if it's a SWXCR
controller (KZPSC, KZESC, KZASC), there is indeed a maximum size of 32G in
a single raidset. You could still make multiple raidsets and combine them
into a single advfs domain larger thatn 32G.
.
.
.
This sounds awefully like the RAID group limitation of the KZPAC-?? series
( The Mylex DAC960s ). The KZPAC have a logical RAID group limit size of
35GBs.
The KZPAC is a three-channel PCI RAID controller. If you're using the
HSZ?? series of RAID controllers, then you should be alright.
The size of an ADVFS can be very large. ( Multiple TBs? ). We have ADVFS
file domains in excess of 100GBs.
.
.
.
Advfs doesn't have a restriction on the disk types. You could have all
different types as different volumes in the same domain. (Note, though
that if one disk type was much slower, you'd effectively slow down the
whole domain.) If the disks are behind an HSZ50, AdvFS doesn't know what
the real disk types are anyway!
You do need to have disks that are the same size, if not exactly the
same type, within a single raid set; otherwise, you'd waste space on
the larger disks. And of course, there may be shelf-dependent restrictions
on using the same general type (e.g., narrow or wide) on a single shelf.
Examples:
- One domain consisting of two volumes: one volume being a raid set of
all 9G drives and the other one being a raid set of all 4G drives.
This will work fine.
.
.
.
> ----------
> From: SIMEONE, Allan J.
> Sent: Monday, September 14, 1998 3:27PM
> To: 'alpha-osf-managers_at_ornl.gov'
> Subject: ADVFS size restriction?
>
> Hi All,
>
> Earlier, I logged a call to Compaq about adding 9 gig disks to a BA356
> shelf that already had 4 gig disks, make a seperate raid set out of the
> 9 gigs and then add the raid set to the 4 gig advfs domain. In a
> nutshell,
> he said it wouldn't work. Anyway, the conversation went on saying that
> there is
>
> a restriction with the KZPSA and ADVFS in that ADVFS can only be a
> maximum of 32GIG. He told me there was another scsi card I can put in
> the 8400 that would get by the 32GIG restriction, but the database was
> down
> and he couldn't look it up. So, before I log another call, does anyone
> know
> what that SCSI card is and what would be the limitation? Would the
> limitation of the 32GIG still be in effect if I used UFS instead of ADVFS?
>
> FYI I'm now looking into purchasing 18gig disks instead of the 9gig and
> making them go through their own HSZ's and own SCSI card, but I need
> to know the SCSI card to get. We need to build atleast a 100GIG raid
> set and be able to add to it down the road.
>
> thanks,
> Allan
>
Received on Mon Sep 14 1998 - 21:03:32 NZST