Rp8400 io performace is very low.

[Sarjerao]

I am facing io performance issue on rp8400 server.
Its simple configuration no napr or vpar.
2 cell baord/8PCU/12GB /Internal 4 disk/os 11.31

test is file of 300 mb & if I run copy it take 35 second to copy the file

/home>time cp test test1

other server e.g rx2660 takes only 6 seconds.

Let me know if any tunning required for this.

[Torsten. · Accepted solution]

The internal disks of a rp8400 are Ultra-2, the internal disks of a rx2660 are SAS - this is at least 4 times faster.

Anyway, your disks are too slow - what do you get from

# scsictl -c get_target_parm /dev/rdsk/c2t0d0

(use the appropriate device file for your disk)!

[Sarjerao]

# scsictl -c get_target_parm /dev/rdisk/disk26

TARGET LIMITS
-------------
flags: 0x0
width: 16 bits (8 = Narrow; 16 = Wide)
req/ack offset: 16
xfer rate: 20000000
SPEED: 40 MB/s (Ultra Wide)

NEGOTIATED TARGET VALUES
------------------------
flags: 0x0
width: 16 bits (8 = Narrow; 16 = Wide)
req/ack offset: 16
xfer rate: 20000000
SPEED: 40 MB/s (Ultra Wide)