====== IBM SVC Problems ======

===== SVC snap =====

SVC snap (dump level 4)

<cli prompt='>'>
IBM_2145:SVC:superuser> svc_livedump
IBM_2145:SVC:superuser> svc_snap gui3
</cli>

<cli prompt='>'>
IBM_2145:SVC:superuser>sainfo lscmdstatus
last_command satask sesdump 78xxxxx -nohdr
last_command_status CMMVC8008E Cannot execute on this SAN Volume Controller node.
T3_status
T3_status_data
cpfiles_status Complete
cpfiles_status_data Copied 64 of 64
snap_status Complete
snap_filename /dumps/snap.78xxxxx.231118.124337.tgz
installcanistersoftware_status
supportupload_status
supportupload_status_data
supportupload_progress_percent 0
supportupload_throughput_KBps 0
supportupload_filename
downloadsoftware_status
downloadsoftware_status_data
downloadsoftware_progress_percent 0
downloadsoftware_throughput_KBps 0
downloadsoftware_size
</cli>
===== SVC ports Gbic =====

To find the Gbic strengh use the command (only on SVC nodes):
<cli prompt='>'>
IBM_2145:SVC:superuser>lsportstats -node svca02
From statistics file :

Nn_stats_78GXXXX_230202_150839
<port id="1"
type="FC"
type_id="1"
wwpn="0x500507680c119eb6"
fc_wwpn="0x500507680c119eb6"
fcoe_wwpn=""
sas_wwn=""
iqn=""
hbt="4714964" hbr="786432" het="0" her="3445"
cbt="720896" cbr="2597960" cet="4119" cer="0"
lnbt="638827617852629" lnbr="171636294431369" lnet="104802162425" lner="129411124779"
rmbt="0" rmbr="0" rmet="0" rmer="0"
dtdt="92645782218" dtdc="3176862868" dtdm="129411128223"
dtdt2="92645782218" dtdc2="3176862868"
lf="5" lsy="699" lsi="1" pspe="0"
itw="1291" icrc="173" bbcz="0"
tmp="52" tmpht="75" txpwr="538" txpwrlt="125" rxpwr="606" rxpwrlt="10"
hsr="0" hsw="0" har="0" haw="0"
--
<port id="2"
type="FC"
type_id="2"
wwpn="0x500507680c129eb6"
fc_wwpn="0x500507680c129eb6"
fcoe_wwpn=""
sas_wwn=""
iqn=""
hbt="1497254423256" hbr="1859489880064" het="0" her="238639744"
cbt="3133748710116588" cbr="2782148984539573" cet="106112756694" cer="0"
lnbt="586602727556866" lnbr="201676804159688" lnet="145719201964" lner="159943712570"
rmbt="0" rmbr="0" rmet="0" rmer="0"
dtdt="487314963192" dtdc="9103323539" dtdm="160205974195"
dtdt2="487314963192" dtdc2="9103323539"
lf="6" lsy="607" lsi="2" pspe="0"
itw="78" icrc="248" bbcz="0"
tmp="60" tmpht="75" txpwr="520" txpwrlt="125" rxpwr="631" rxpwrlt="10"
hsr="0" hsw="0" har="0" haw="0"
--
<port id="3"
type="FC"
type_id="3"
wwpn="0x500507680c139eb6"
.....
</cli>

**Check if TX power (transmit µW) or RX power (receive µW) is low ?**
  txpwr="520" rxpwr="631"

===== Data corruption (bad blocks) =====

<cli prompt='>'>
IBM_Storwize:V7000:superuser>lsmdisk
id name   status mode  mdisk_grp_id mdisk_grp_name capacity ctrl_LUN_# controller_name UID tier            ence_id site_name distributed dedupe
0  mdisk0 online array 0            Pool0          6.5TB                                   tier_enterprise no                no          no
1  mdisk1 online array 0            Pool0          6.5TB                                   tier_enterprise no                no          no
2  mdisk2 online array 0            Pool0          6.5TB                                   tier_enterprise no                no          no
IBM_Storwize:V7000:superuser>dumpmdiskbadblocks 0
IBM_Storwize:V7000:superuser>dumpmdiskbadblocks 1
IBM_Storwize:V7000:superuser>dumpmdiskbadblocks 2
IBM_Storwize:V7000:superuser>dumpallmdiskbadblocks
</cli>

In case of error:
<cli prompt='>'>
IBM_Storwize:V7000:superuser>dumpmdiskbadblocks 3

The resulting output if the MDisk has bad blocks:

Cluster name: my_cluster
Timestamp of dump: Fri Oct 31 11:27:33 2009 UTC

Mdisk id: 3
Mdisk name: mdisk3
Number of bad blocks: 6

Start LBA: 0x1234123412341234
Length: 2
Event log sequence number: 1

Start LBA: 0x5678567812341234
Length: 4
Event log sequence number: 2

The resulting output if the MDisk has no bad blocks:

Cluster name: my_cluster
Timestamp of dump: Fri Oct 31 11:27:33 2009 UTC
</cli>

Remediation:
<cli prompt='>'>
svctask repairsevdiskcopy
</cli>

===== PPRC (replication) =====

if not possible to stop the replication, do a
  stoprcconsistgrp -access //constistgrp_name//
  stoprcrelationship -access //constistgrp_name//

Then you 'll be able to map your replicas in read-write mode

The primary volume is accessible for read and write I/O, and the secondary volume is 
accessible for read-only I/O. This state is also called “normal copy state” and indicates that 
your relationship is both consistent and synchronized. 


===== PPRC (replication) =====

v7000 or SVC volumes (vdisk) offline, with cache corrupt:
  recovervdiskbysystem
Or by volume
  recovervdisk vdisk45
  
===== Error on mdisk path degraded =====

If an mdisk has to many error, once solved, it leave in warning state, depite clearing logs, then you have to manage it again from cluster:
<code>
IBM_2145:svc-c1:admin>lsmdisk
id name               status         mode    mdisk_grp_id mdisk_grp_name     capacity ctrl_LUN_#  controller_name    
8  m_v7000_c1_900_01  degraded_ports managed 1            p_v7000_c1_900_01  4.9TB    00008       v7000-c1-sc1    
IBM_2145:svc-c1:admin>includemdisk 8
IBM_2145:svc-c1:admin>detectmdisk
</code>

===== Error unable to create mirror vdisk =====

On SVC / storwize (V3700 V5000 V7000) there are reserved space used for bitmap, on each IOgroup. If no more memory free (lsiogrop <id>), you can extend this reserved space, it's used for flashcopy, remote mirroring, vdisk mirror and raid, in case of internal disks.
<code>
chiogrp -feature --+- flash --+-- -- -size -- memory_size --+-------+-'   io_group_name
                   +- remote -+                             '- -kb -'     
                   +- mirror -+                                           
                   '- raid ---'                                           
</code>

<cli prompt='>'>
IBM_4939:V7000:superuser>lsiogrp
id name            node_count vdisk_count host_count 
0  io_grp0         2          45          16         
1  io_grp1         0          0           12         
2  io_grp2         0          0           12         
3  io_grp3         0          0           12         
4  recovery_io_grp 0          0           0          
IBM_4939:V7000:superuser>lsiogrp 0
id 0
name io_grp0
node_count 2
vdisk_count 45
host_count 16
flash_copy_total_memory 20.0MB
flash_copy_free_memory 20.0MB
remote_copy_total_memory 20.0MB
remote_copy_free_memory 20.0MB
mirroring_total_memory 20.0MB
mirroring_free_memory 20.0MB
raid_total_memory 40.0MB
raid_free_memory 37.2MB
maintenance no
compression_active yes
accessible_vdisk_count 45
compression_supported yes
</cli>

===== Error unable to use external virtualization or replication =====

[[http://emmanuel.iffly.free.fr/doku.php?id=storage:svc_cmd#change_system_layer_for_replication_or_external_virtualization| Change system layer (for replication or external virtualization)]]