linux - Adding disks to add more space to RAID 1+0 array

I have a HP ProLiant DL380p Gen8 server running Ubuntu
14.04.1 LTS. During the installation I had setup RAID 1+0(which I believe is same as
RAID 10?):

hpssacli ctrl all show
config
Smart Array P420i in Slot 0 (Embedded) (sn: 00143803246ED20)

array A (SAS, Unused Space: 0 MB)
logicaldrive 1 (838.1 GB, RAID 1+0,
OK)

 physicaldrive
            1I:2:1 (port 1I:box 2:bay 1, SAS, 300 GB, OK)
 physicaldrive 1I:2:2 (port
            1I:box 2:bay 2, SAS, 300 GB, OK)
 physicaldrive 1I:2:3 (port 1I:box 2:bay 3,
            SAS, 300 GB, OK)
 physicaldrive 1I:2:4 (port 1I:box 2:bay 4, SAS, 300 GB,
            OK)
 physicaldrive 2I:2:5 (port 2I:box 2:bay 5, SAS, 300 GB, OK)

            physicaldrive 2I:2:6 (port 2I:box 2:bay 6, SAS, 300 GB,
            OK)

SEP (Vendor ID
PMCSIERA, Model SRCv8x6G) 380 (WWID:
500143803246ED2F)

The server is now
running out of space and I would like to add more disks to it. Is it possible to do this
without any down time? Can I just replace one disk at a time with a higher capacity one
and once I am done replacing them all, just expand the file system(not sure which
command to use here)?

If this is not possible,
what are my options?

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