Why zlinux guest shows error messages "An error occurred in the DASD device driver, reason=09"?

Issue

• Hitachi VSP storage systems connected to IBM z196 via FICON channels. With the latest microcode updates, shows errors on kernel boot as follows:

00253 Buffer I/O error on device dasdg1, logical block 0                        
00254 lost page write due to I/O error on dasdg1                                
00255 /dev/dasdi1: clean, 38/36000 files, 6500/143976 blocks""                  
00256 /dev/dasdf1: clean, 3774/150176 files, 247536/600456 blocks""             
00257 dasd-eckd 0.0.0203: An error occurred in the DASD device driver, reason=09

00258 dasd(eckd): I/O status report for device 0.0.0203:                        
00259 <3>dasd(eckd): in req: 000000007d8e1ea8 CC:00 FC:04 AC:00 SC:17 DS:0E CS:0
0 RC:0                                                                          
00260 <3>dasd(eckd): device 0.0.0203: Failing CCW: 000000007d8e1fb0             
00261 <3>dasd(eckd): Sense(hex)  0- 7: 80 00 00 00 41 ff ff 04                  
00262 <3>dasd(eckd): Sense(hex)  8-15: e7 20 2d 00 03 00 00 00                  
00263 <3>dasd(eckd): Sense(hex) 16-23: 6d b2 00 01 20 55 0f 04                  
00264 <3>dasd(eckd): Sense(hex) 24-31: 00 00 40 e1 00 00 00 00                  
00265 <3>dasd(eckd): 24 Byte: 0 MSG 4, no MSGb to SYSOP                         
00266 dasd(eckd): Related CP in req: 000000007d8e1ea8                           
00267 <3>dasd(eckd): CCW 000000007d8e1fa8: E7400040 7D8E1FB8 DAT:  01c00100 5500
0000                                                                            
00268 d86                                                                       
00269 <3>dasd(eckd): CCW 000000007d8e1fb0: A5041000 7D8E1FF8 DAT:  c03b3998 0000

• The disks seem to go READ ONLY spontaneously.