Hi Mahes,
just few thoughts:
>> 1. With the RAID 5 at AIX level, should a second, synchronized copy
of DB volumes is required.
It had been argumented on this forum that TSM mirroring has
some advantages over OS-based Raid system.
Anyway, an OS-based RAID and only single database volumes
would definitely help against single disk failure as well.
>> 2. If I do not keep a second copy and take daily full backup, would
it
be RISKY.
Database backup is mandatory whether you use Raid5 of whatever else.
I, for example, make full backupo each day and about 10 incremental backups
in between.
Be sure you can perform database restore - do test it!
be sure you can afford this down time in case of need.
>> IBM's version is that since a second copy MUST be kept
It�s new for me. I think it is only recommended.
Raid 5 and 80 GB Database: do not forget, database updates (such as restore
from backup) will take much longer with Raid5!
regards
juraj salak
-----Urspr�ngliche Nachricht-----
Von: Mahesh Babbar [mailto:[EMAIL PROTECTED]]
Gesendet am: Sonntag, 22. April 2001 09:53
An: [EMAIL PROTECTED]
Betreff: RAID-5 Vs Mirroring
Hi all,
Environment:
NSM 3466, RS 6000, AIX 4.3.2 , TSM version 3.7.4,
12 x 18.2 GB disk ( for DB and Diskpool Volumes)
My current DB is of 80 GB size and is alarmingly utililized ( 95
%).The DB volulmes are mirrored inside TSM ( Second Copy).
Therefore another 80 GB space is being used for the second copies. In
order to have more usable space for DB, a suggestion has been mooted
to go for RAID-5 at the hardware level.
IBM's version is that since a second copy MUST be kept , going for
RAID 5 shall require more disk space. Now my question is:
1. With the RAID 5 at AIX level, should a second, synchronized copy
of DB volumes is required.
2. If I do not keep a second copy and take daily full backup, would it
be RISKY.
3. Configuring RAID 5 at this juncture, would anybody see any pitfall
ahead.
Any comments are welcome!
Regards
MAhesh
