Raid and replacing a disk, do i need to reinstall software? (RAID 10)

I have 4 250GB disks inside the Mac Pro, the first two are striped and the second two mirror the first two.
This gives me, perfprmance and some redundancy (I think) I have only 500GB available in this config so it is quite expensive, but works for me, my question is
"Can I replace the first disk from the set of four and then rely on the mirrord disks (3+4) to write data to the first disk, therby negating my need to do a restore?
Can I use he mirror function (almost a hot swap scenario)?
Views appreciated

The final chapter is this saga,
I replaced the disk and restarted my system, Disk utility was showing "degraded" for the raid config, I formatted the new drive created a new striped set but could not get the mirror to resynchronize , I tried the command line approach but after some time I was unsuccessful in getting the mirror to rebuild. So I thought this would be a good time to scratch all four disks and try softRAID as a solution, I purchased a full license but I discovered that softRaid only supports RAID 0 or RAID 1 and is not able to create a RAID 10 configuration. (James from SoftRAID explained that this was something being looked at for the future but one of the complexities was how to best represent RAID 10 graphically).
In the end I went back to Apples Disk Utility tool to create my RAID 10 config (ie disk 1 and 2 striped to create set A, disk 3 and 4 striped to create set B and then set A and B mirrored together), restored from backup and all is well.
I still need to figure out/learn how to add a replacement disk and then get the mirror to rebuild, but I proved that I could remove any one disk and still have a fully working/bootable system. Almost there......

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Raid and replacing a disk, do i need to reinstall software? (RAID 10)

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