From: Hackett, Peter (PHackett@talisman-energy.com)
Date: Wed Jan 31 2007 - 20:57:47 EST
All,
I've setup SVM on some of my servers with one way mirrors and frequently
encounter errors in form of 'needs maintenance' on the one submirror.
Although all the underlying filesystem are OK, and it doesn't appear to
be a real problem, it's an annoyance I would like to resolve. The disk
here in this case come from a SAN, but I have also seen this when done
with DAS as well. The errors are not there on metadevice creation, but
appear after a while. I like the flexibiltiy that one-way mirrors
provide when using SVM in a SAN environment when VxVM is not available,
but the errors do cause problems as far as monitoring goes.
One a box which has 8 one-way mirrors, 2 of them are in 'need
maintenance' state. Below is a metastat output which shows one-way
mirrors at d40, d50, d60, d65, d70, d75, d80, & d85.
My questions are why would I have errors on my one-way mirrors at d60
and d80 when all the disks and filesystems are OK.
Is there anything wrong with doing one-way mirrors?
Is there a gracefull way to correct these errors and bring these back
into an Okay state.
Any and all help and feedback appreciated.
Thanks,
Peter
--
box123 # metastat
d0: Mirror
Submirror 0: d1
State: Okay
Submirror 1: d2
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 16393536 blocks (7.8 GB)
d1: Submirror of d0
State: Okay
Size: 16393536 blocks (7.8 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s0 0 No Okay Yes
d2: Submirror of d0
State: Okay
Size: 16393536 blocks (7.8 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s0 0 No Okay Yes
d5: Mirror
Submirror 0: d6
State: Okay
Submirror 1: d7
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 32776896 blocks (15 GB)
d6: Submirror of d5
State: Okay
Size: 32776896 blocks (15 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s1 0 No Okay Yes
d7: Submirror of d5
State: Okay
Size: 32776896 blocks (15 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s1 0 No Okay Yes
d10: Mirror
Submirror 0: d11
State: Okay
Submirror 1: d12
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 24585216 blocks (11 GB)
d11: Submirror of d10
State: Okay
Size: 24585216 blocks (11 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s3 0 No Okay Yes
d12: Submirror of d10
State: Okay
Size: 24585216 blocks (11 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s3 0 No Okay Yes
d15: Mirror
Submirror 0: d16
State: Okay
Submirror 1: d17
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 28594560 blocks (13 GB)
d16: Submirror of d15
State: Okay
Size: 28594560 blocks (13 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s5 0 No Okay Yes
d17: Submirror of d15
State: Okay
Size: 28594560 blocks (13 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s5 0 No Okay Yes
d20: Mirror
Submirror 0: d21
State: Okay
Submirror 1: d22
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 40968576 blocks (19 GB)
d21: Submirror of d20
State: Okay
Size: 40968576 blocks (19 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t0d0s4 0 No Okay Yes
d22: Submirror of d20
State: Okay
Size: 40968576 blocks (19 GB)
Stripe 0:
Device Start Block Dbase State Reloc Hot Spare
c1t1d0s4 0 No Okay Yes
d30: Mirror
Submirror 0: d31
State: Okay
Submirror 1: d32
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 286678272 blocks (136 GB)
d31: Submirror of d30
State: Okay
Size: 286678272 blocks (136 GB)
Stripe 0: (interlace: 32 blocks)
Device Start Block Dbase State Reloc Hot Spare
c1t2d0s0 0 No Okay Yes
c1t4d0s0 10176 No Okay Yes
d32: Submirror of d30
State: Okay
Size: 286678272 blocks (136 GB)
Stripe 0: (interlace: 32 blocks)
Device Start Block Dbase State Reloc Hot Spare
c1t3d0s0 0 No Okay Yes
c1t5d0s0 10176 No Okay Yes
d40: Mirror
Submirror 0: d41
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 495022080 blocks (236 GB)
d41: Submirror of d40
State: Okay
Size: 495022080 blocks (236 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000578641C31FC00006723Fd0s0 0 No
Okay Yes
d50: Mirror
Submirror 0: d51
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 495022080 blocks (236 GB)
d51: Submirror of d50
State: Okay
Size: 495022080 blocks (236 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000578641C31FF4000495D6d0s0 0 No
Okay Yes
d60: Mirror
Submirror 0: d61
State: Needs maintenance
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 428863488 blocks (204 GB)
d61: Submirror of d60
State: Needs maintenance
Invoke: after replacing "Maintenance" components:
metareplace d60 c4t60020F200000607E4071E2CA0001A386d0s0
<new device>
Size: 428863488 blocks (204 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000607E4071E2CA0001A386d0s0 0 No
Last Erred Yes
d65: Mirror
Submirror 0: d66
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 428863488 blocks (204 GB)
d66: Submirror of d65
State: Okay
Size: 428863488 blocks (204 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000607E4071E2E30009C708d0s0 0 No
Okay Yes
d70: Mirror
Submirror 0: d71
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 428863488 blocks (204 GB)
d71: Submirror of d70
State: Okay
Size: 428863488 blocks (204 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000607E4071E247000F3A5Ed0s0 0 No
Okay Yes
d75: Mirror
Submirror 0: d76
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 428863488 blocks (204 GB)
d76: Submirror of d75
State: Okay
Size: 428863488 blocks (204 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000607E4071E267000C7513d0s0 0 No
Okay Yes
d80: Mirror
Submirror 0: d81
State: Needs maintenance
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 1000681472 blocks (477 GB)
d81: Submirror of d80
State: Needs maintenance
Invoke: after replacing "Maintenance" components:
metareplace d80 c4t60020F200000ED6C430A01B100017AA8d0s0
<new device>
Size: 1000681472 blocks (477 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000ED6C430A01B100017AA8d0s0 0 No
Last Erred Yes
d85: Mirror
Submirror 0: d86
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 786544640 blocks (375 GB)
d86: Submirror of d85
State: Okay
Size: 786544640 blocks (375 GB)
Stripe 0:
Device Start Block Dbase
State Reloc Hot Spare
c4t60020F200000ED6C434C17AF0003BE9Fd0s0 0 No
Okay Yes
----END
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