Loosing connection to both paths(SPA/SPB)

this LUN in question ..in its properties you don't have "Auto assignment Enabled" checked ?

chk emc68926 &
Proactive polling should be turned off.

ive faced a similar problem ( but with dm-multipath native linux tool and with eva4400)
os keep losing native devices for about 3-4 second
solutions was changing some parameter in dm-multipath
path checker was changed from readsector 0 to tur
tur based on scsci command to check if lun is accessible
. allow I/O queuing ,and ive changed number of path retry
but i think firstly as dynamox suggested , check auto assignment option for ur lun

Hi Santhosh,

Can you confirm that the /etc/Navisphere/agent.config file is setup correctly as per emc59539

the most important part is setting initiator type to "no AutoTrespass" by commenting out the following entry in the agent.config file:

# OptionsSupported AutoTrespass

Stop and start the Navisphere host agent

See also solutions emc66214, emc66215, emc66216, and emc65749.

Conor

auto-trespass is already disabled.

# grep -i tres agent.config
# auto-trespass when it starts up. To enable auto-trespass on Agent
# OptionsSupported AutoTrespass
# will be to disable auto-trespass.

Already gave a try with proactive polling diabled even though the primus details does not really match with our envioronment

auto asighnment is disabled too

Can you try enabling auto-assignment on the LUN and retest?

i am not enabling the auto asighnment as my working LUn has the same setting.
The strange thing is that when tried tress passing the LUN it return success status. But effectively no change and the LUN still stick to the same SP. why it could be?

let me know if you any thing strange. ?

LOGICAL UNIT NUMBER 45
Prefetch size (blocks) = 0
Prefetch multiplier = 4
Segment size (blocks) = 0
Segment multiplier = 4
Maximum prefetch (blocks) = 4096
Prefetch Disable Size (blocks) = 4097
Prefetch idle count = 40

Variable length prefetching YES
Prefetched data retained YES

Read cache configured according to
specified parameters.

Total Hard Errors: 0
Total Soft Errors: 0
Total Queue Length: 511313114
Name LUN 45
Minimum latency reads N/A


Read Histogram[0] 2
Read Histogram[1] 287
Read Histogram[2] 355
Read Histogram[3] 47209
Read Histogram[4] 319988519
Read Histogram[5] 5250023
Read Histogram[6] 10855643
Read Histogram[7] 31392342
Read Histogram[8] 2257985
Read Histogram[9] 6523019
Read Histogram overflows 0

Write Histogram[0] 0
Write Histogram[1] 182
Write Histogram[2] 344
Write Histogram[3] 3606852
Write Histogram[4] 14511428
Write Histogram[5] 3598578
Write Histogram[6] 2171197
Write Histogram[7] 717521
Write Histogram[8] 836232
Write Histogram[9] 185537
Write Histogram overflows 0

Read Requests: 376315384
Write Requests: 25627871
Blocks read: 1791312442
Blocks written: 1032833740
Read cache hits: 258643780
Read cache misses: N/A
Prefetched blocks: 1670304624
Unused prefetched blocks: 1893785558
Write cache hits: 2869029
Forced flushes: 73114
Read Hit Ratio: N/A
Write Hit Ratio: N/A
RAID Type: RAID5
RAIDGroup ID: 2
State: Bound
Stripe Crossing: 57954008
Element Size: 128
Current owner: SP A
Offset: 0
Auto-trespass: DISABLED
Auto-assign: DISABLED
Write cache: ENABLED
Read cache: ENABLED
Idle Threshold: 0
Idle Delay Time: 20
Write Aside Size: 2048
Default Owner: SP B
Rebuild Priority: ASAP
Verify Priority: ASAP
Prct Reads Forced Flushed: 0
Prct Writes Forced Flushed: 0
Prct Rebuilt: 100
Prct Bound: 100
LUN Capacity(Megabytes): 138105
LUN Capacity(Blocks): 282839040
UID: 60:06:01:60:F1:73:11:00:A6:9E:6D:22:C3:E5:DA:11
Bus 0 Enclosure 1 Disk 0 Queue Length: 627018027
Bus 0 Enclosure 1 Disk 1 Queue Length: 604945012
Bus 0 Enclosure 1 Disk 2 Queue Length: 517805969
Bus 0 Enclosure 1 Disk 3 Queue Length: 589108731
Bus 0 Enclosure 1 Disk 4 Queue Length: 491836429
Bus 0 Enclosure 1 Disk 5 Queue Length: 495230649
Bus 0 Enclosure 1 Disk 6 Queue Length: 524849429
Bus 0 Enclosure 1 Disk 7 Queue Length: 499729222
Bus 0 Enclosure 1 Disk 8 Queue Length: 474984733
Bus 0 Enclosure 1 Disk 9 Queue Length: 484793717
Bus 0 Enclosure 1 Disk 10 Queue Length: 479735172
Bus 0 Enclosure 1 Disk 11 Queue Length: 476891039
Bus 0 Enclosure 1 Disk 12 Queue Length: 477240770
Bus 0 Enclosure 1 Disk 13 Queue Length: 497170234
Bus 0 Enclosure 1 Disk 14 Queue Length: 520140978
Bus 0 Enclosure 1 Disk 0 Hard Read Errors: 0

can the initiatortype be changed online? i am thinking of swiching to "HP autotresspass" after disabling/removing the powerpath for testing purpose.

all solutions that i have seen require host reboot.

hosts are migrated and moved to PP 5.1(SP1) and with two HBA.