Hi all,
One disk on my root disk group failed in Veritas Volume manager.
I replaced it with new one, initialized it and placed it with removed one.
it Synchronized plexes and everything is fine. this node was second standby node of Sun cluster. yesterday I had failure on active node with boot disk (same as second node) .. but what is puzzled me here it has mirror and it was alive .. it gives me warning not even error like:
Sep 27 22:07:19 host-1 scsi: [ID 107833 kern.warning] WARNING: /ssm@0,0/pci@18,700000/scsi@2/sd@0,0 (sd3):
Sep 27 22:07:19 host-1 disk not responding to selection
Sep 27 22:07:19 host-1 vxio: [ID 107055 kern.warning] WARNING: VxVM vxio V-5-3-0 voldmp_errbuf_sio_start: Failed to flush the error buffer 0xdbf3c330 on device0x12800000003 to DMP
Sep 27 22:07:19 host-1 vxio: [ID 771159 kern.warning] WARNING: VxVM vxio V-5-0-2 Subdisk rootdg_2-01 block 64703344: Uncorrectable read error
First 2 lines are from system not from VxVM but after that vxio informed.
So it was at 22:07:19 and 30 seconds it continued give this log to terminal after what cluster said :
Sep 27 22:07:59 host-1 cl_dlpitrans: [ID 624622 kern.notice] Notifying cluster that this node is panicking
Sep 27 22:07:59 host-1 unix: [ID 836849 kern.notice]
Sep 27 22:07:59 host-1 ^Mpanic[cpu0]/thread=2a100045d20:
Sep 27 22:07:59 host-1 unix: [ID 562397 kern.notice] Failfast: Aborting because "rgmd" died 30 seconds ago.
and went to reboot ..
So why cluster got this warning like whole root-dg failured and went to reboot?!!! 
and after that Application swithed to second node (where I changed failured disk not long ago and everything is fine) .. so there it started normally but I see in iostat that on first disk (exactly that was replaced) ..it has very big IO than other mirrored disk. So how Veritas synchronize, I mean how it works. Mirrored disks in VxVM always must have same IO ???
it is some time :
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.4 1.7 17.1 28.0 0.2 0.0 90.7 14.3 19 1 c1t0d0
1.1 2.1 61.3 17.5 0.0 0.0 0.0 11.8 0 1 c1t1d0
and sometimes:
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.2 0.0 1.6 1.0 0.0 5000.0 5.5 100 0 c1t0d0
0.0 0.2 0.0 1.6 0.0 0.0 0.0 5.4 0 0 c1t1d0
??!!!!!!!! :(:(
Thanks all