What are these files doing in my /dbs directory?

Code:
[oracle@fedora10 dbs]$ ls
arch1_10_682014240.dbf  arch1_2_682610081.dbf   arch1_49_672770507.dbf
arch1_11_682014240.dbf  arch1_27_682014240.dbf  arch1_50_672770507.dbf
arch1_12_682014240.dbf  arch1_28_682014240.dbf  arch1_5_682014240.dbf
arch1_13_682014240.dbf  arch1_29_682014240.dbf  arch1_5_682610081.dbf
arch1_14_682014240.dbf  arch1_30_682014240.dbf  arch1_6_682014240.dbf
arch1_15_682014240.dbf  arch1_31_682014240.dbf  arch1_6_682610081.dbf
arch1_16_682014240.dbf  arch1_32_682014240.dbf  arch1_7_682014240.dbf
arch1_1_681994290.dbf   arch1_33_682014240.dbf  arch1_7_682610081.dbf
arch1_1_682014240.dbf   arch1_34_682014240.dbf  arch1_8_682014240.dbf
arch1_17_682014240.dbf  arch1_35_682014240.dbf  arch1_8_682610081.dbf
arch1_18_682014240.dbf  arch1_36_682014240.dbf  arch1_9_682014240.dbf
arch1_19_682014240.dbf  arch1_3_682014240.dbf   hc_orcl.dat
arch1_20_682014240.dbf  arch1_3_682610081.dbf   initdw.ora
arch1_21_682014240.dbf  arch1_37_682014240.dbf  init.ora
arch1_22_682014240.dbf  arch1_38_682014240.dbf  initorcl.ora
arch1_23_682014240.dbf  arch1_39_682014240.dbf  inittest.ora
arch1_24_682014240.dbf  arch1_40_682014240.dbf  lkORCL
arch1_25_682014240.dbf  arch1_4_682014240.dbf   orapworcl
arch1_26_682014240.dbf  arch1_4_682610081.dbf   snapcf_orcl.f
arch1_2_682014240.dbf   arch1_48_672770507.dbf  spfileorcl.ora