| Title: | Ask the Storage Architecture Group |
| Notice: | Check out our web page at http://www-starch.shr.dec.com |
| Moderator: | SSAG::TERZA N |
| Created: | Wed Oct 15 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 6756 |
| Total number of notes: | 25276 |
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 4350.1 | Answers | SUBSYS::CARAKATSANE | Wed Jun 21 1995 08:33 | 13 | |
| 4350.2 | - Thanks Thanks! | PENSKE::SDATZMAN | Wed Jun 21 1995 08:38 | 5 | |
| 4350.3 | OpenVMS KZPSC and big RAID set | WOTVAX::DODD | Fri Jan 31 1997 09:29 | 15 | |
May be the right place...
Customer has created a 20GB raid set with a KZPSC. OpenVMS INIT creates
a clustersize of 41. This customer has masses of little files and hence
wastes lots of space. Can the KZPSC present "partitions"? ie say 5x4GB
drives built on a 20GB RAID set. He bought RAID 'cos people told him it
protects his data.
Could the StorageWorks RAID sofware help? Where is that discussed?
This must have been discussed somewhere before?
Thanks
Andrew
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| 4350.4 | EPS::VANDENHEUVEL | Hein | Thu Mar 13 1997 09:38 | 36 | |
> ie say 5x4GB drives built on a 20GB RAID set.
> He bought RAID 'cos people told him it protects his data.
I've got this bridge for sale...
Quite some time has passed since posting this question so I hope
that the customer has been suitably educated since. Just in case...
RAID will only protect if you choose a protecting raid level.
That is he need to pick raid 1, raid 0+1 or raid 5.
5*4 equating 20GB suggest they picked RAID-0 which offers NO
protection and in fact multiplies the chances of running into trouble.
(If any of the 5 disks fails, the whole set will fail).
> Can the KZPSC present "partitions"?
Yes. Create the 'group' then select a raid type, then select
a size smaller than the group size. You can cut up the group
into multiple partitions and they may have different raid
characteristics. So those 5 * 4 GB can be configured as 2GB
of safe storage in RAID 0+1 (taking 4GB of space) and 4 raid-0's
of 1 GB for small file storage and another 12GB raid-0 for
large file storage. The limiting factor is the maximum number
of logical units the controlled is willing to present: only 8.
There is also VMS soft/free ware (VDdriver) to partition disks.
> This must have been discussed somewhere before?
Yes.
hth.
Hein.
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