| Title: | Oracle |
| Notice: | For product status see topics: UNIX 1008, OpenVMS 1009, NT 1010 |
| Moderator: | EPS::VANDENHEUVEL |
| Created: | Fri Aug 10 1990 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1574 |
| Total number of notes: | 4428 |
Hi people:
A simple cuestion.
I have a customer that he asks me about raw devices.He has Oracle
database using raw devices.
Oracle said that Digital Unix utilises a 64k operating system header
at the begining of each raw device.
I have tested this with dd comand.
dd if=/etc/inittab of=/dev/rrz5c
dd writes in a block 0 if not labeled
or
block 1 if the disk is labeled using in dd command seek=1
Is true that Digital Unix uses a 64k or is a caracteristic of
Oracle?
Thanks,in advanced.
Helps will be welcome.
Francesc
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1571.1 | Re: raw devices 64k | AMCUCS::KKDAS | Let's Train The Trainers | Mon Jun 02 1997 18:34 | 9 |
This is an Oracle implementation to avoid confusion. Unlike other databases (Informix and Sybase) Oracle doesn't allow an offset in raw disks, therefore, datafile creation would fail if a partition is used that starts from block 0 (default partitions 'a' and 'c' of a labeled disk) but it will succeed for other partitions. Introducing a default offset of 64K eleminates the confusion. /KK/ | |||||
| 1571.2 | Thanks | BARNA::DSMAIL | Tue Jun 03 1997 14:03 | 3 | |
Thanks.
| |||||
| 1571.3 | Oracle version ? | NNTPD::"srinath@qca.mts.dec.com" | qcav01::srinath | Tue Jun 03 1997 14:22 | 12 |
Hi KK Thanks for that .1 info - But i have faced problems when using the 'a' partition as raw. The Oracle version was 7.1.6 and Digital Unix 3.2c, any high volume i/o on that partition would create failure of the datafile. Putting a redolog(raw) in that partition was fatal for me on one occasion. Any ideas why this happened?. 73's srinath [Posted by WWW Notes gateway] | |||||