i have a dell 2650 server it has a raid 5 with 3 73gig drives partition with a c for os and x for data is it possible to add 2 more 73 gig drives to expand my x partition also its perc 4 di and all drives are on one controller 0
Read the manual for your PERC 4. It's downloadable from Dell website.
From memory I think they do allow RAID5 capacity expansion w/o deleting existing array. Any expanded space will be added as unallocated partition which you'll have to allocate then format before you can store data on them.
One question. Who on earth got you to put OS on a RAID5 array together with your data? Even for hardware RAID5 with good write speed like your PERC 4, a server (especially database) gets hammered a lot, having OS and data on the same array is going to slow it down alot. Typically a server runs its OS+app on RAID10 with 4 small drives or multiples in RAID0. The data is on another array which has redundancy.
This depends on your RAID controller, as some supports rebuild the raid without data loss, but some doesn't, you'd better ask for the vender.
If your controller has this feature, you can add the new drives and rebuild the RAID, after this, you'll get some unallocate space, then use diskpart or third party software to resize the partition.
If you use diskpart, you can only enpand the partition that before the unallocated space. you may check this http://www.partition-tool.com/resource/expand-raid5-par...