Unless your storage device is heavily cached, like IBM ESS or the other big
storage boxes.
There is no way to avoid Raid 5 on ESS, and there is no way to avoid Raid 1
on EMC Symmetrix.


_____________________________
William Mansfield
Senior Consultant
Solution Technology, Inc




                    "Joshua S.
                    Bassi"               To:     ADSM-L AT VM.MARIST DOT EDU
                    <jbassi@IHWY.        cc:
                    COM>                 Subject:     Re: TSM Server 4.1.3 
Performance
                    Sent by:
                    "ADSM: Dist
                    Stor Manager"
                    <ADSM-L AT VM DOT MA
                    RIST.EDU>


                    11/05/2001
                    11:42 AM
                    Please
                    respond to
                    "ADSM: Dist
                    Stor Manager"






I would not recommend using RAID-5 for your disk storage pool unless it
is the only copy of the data and you cannot afford to use plain
mirroring.  TSM uses it's own striping technique for one and for two
RAID-5 has a sever write penalty associated with it.


--
Joshua S. Bassi
Joshua S. Bassi
Independent IT Consultant
IBM Certified - AIX/HACMP, SAN, Shark
Tivoli Certified Consultant- ADSM/TSM
Cell (408)&(831) 332-4006
jbassi AT ihwy DOT com