Hello, we had some VM going to RO today, I've searched logs and I can found this:

Thu 08Dec2011 (tz=-60)
09:56:15.28017000 JNI: ArcAdapter.cpp: Line #: 5021
JNI: getControllerLog()
StorLib::getControllerLog(char *)
ArcAdapter::getControllerLog()
ArcAdapter::getAdapterStatsLog()
*** FSA API Error: FsaGetControllerStats() fsaStatus=479 ***
Thu 08Dec2011 (tz=-60)
09:56:15.159757000 JNI: ArcAdapter.cpp: Line #: 3203
JNI: getEvents()
StorLib::getEvents(char**)
ArcAdapter::getEvents()
*** FSA API Error: FsaPollForEvent(x,x,x) fsaStatus=611 ***

2011/12/08 09:56:15|I/O Errors detected on unit S004. The unit requires your urgent attention in order to decrease the risk of data loss.

Dec 8 09:56:15 [kern.info] kernel: [978330.321409] sd 4:0:4:0: [sde] Result: hostbyte=0x00 driverbyte=0x06
Dec 8 09:56:15 [kern.err] kernel: [978330.321415] end_request: I/O error, dev sde, sector 1330144712
Dec 8 09:56:15 [kern.info] kernel: [978330.321421] dev_vdisk: ***ERROR***: cmd ffff88020188da28 returned error -5
Dec 8 09:56:15 [kern.info] kernel: [978330.321450] sd 4:0:4:0: [sde] Result: hostbyte=0x00 driverbyte=0x00
Dec 8 09:56:15 [kern.err] kernel: [978330.321454] end_request: I/O error, dev sde, sector 1330144720
Dec 8 09:56:15 [kern.info] kernel: [978330.321498] dev_vdisk: ***ERROR***: cmd ffff8801a0e49110 returned error -5
Dec 8 09:56:15 [auth.info] CRON[10740]: (pam_unix) session closed for user root
Dec 8 09:56:15 [local3.err] System: I/O Errors detected on unit S004. The unit requires your urgent attention in order to decrease the risk of data loss.
Dec 8 09:56:15 [authpriv.notice] sudo: root : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/var/nasexe/event.send NewErrors
Dec 8 09:56:15 [auth.info] CRON[10737]: (pam_unix) session closed for user root

This only lasted 2 minutes. I've checked all volumes in ASM and are all optimal. I cannot find any event too. No disks offline also, no hotspares offline.
Any idea what caused this?

Regards