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Just because you have two disks doesn't mean that Solaris will automatically use them as mirrors. You have to set this up, using SVM, ZFS VxVM, or the hardware RAID controller. Sometimes you can do this as part of the install, often it's done afterwards.
You haven't said what type of root file system your Solaris is on, so it's not possible to give you a procedure to mirror the boot drive.
If you use hardware RAID, it will zero any data on the drives, so that's probably out. I suspect you are using hardware management on your first system, as Solaris can't boot from a software striped or RAID5 device. This had to be setup before Solaris was installed on that system.
I have any questions with this issue .
1 .I configured Raid 1 in BIOS . Can I configured RAID 1 before install Solaris or I must configure RAID1 after install Solaris ?
2 .Can I configue RAID 5 in BIOS ? or What I use CD or Software . I want to configure Raid 5 before I install Solaris , Can I do so ? . If not I can install Solaris and after configure RAID 5 with only 3 HDD ( include OS and RAID 5 )
Pls give me some advice ,
Thanks for help ,