Installing S10 on SPARC

Hi,

I have an old sun SPARC server, think its a duel 300mhz cpu's. I am trying to install Solaris 10 on it using a hot-swa[pable SCSI ULTRA HDD caddy thing, it can take scsi HDD's in this box, then a SCSI wire going to thje box. Never used sun, SCSI or Solaris :S

SCSI caddy boots 5 green lights for 5 HDD's and 2 lights on the back with SCSI lead going to my IN slot on the caddy. solaris appears to start, I run though installer options, then it installes, gets to something like...

iscsi driver (usr) and hangs for ages, then says

Error: Could not create the product file

Error: Could not install all packages propduct instalation failed

mkdir: "/a/var/sadm/launcher. I/O error

I am thinking, maybe the hdd that takes usr is dodgy, maybe change the HDD which this installs to? Or maybe this is a known error?

Any advice, tips, or things to do test?

Thanks

Chris

P.S do get some kind of HDD error when starting boot cdrom but this stops after a few mins and install seams to go fine till about 80% when I get that

[1091 byte] By [kicken18a] at [2007-11-26 15:58:52]