Tag Archives: flashsystem

reducevg very slow

Posted by xaminmo

This is an APAR, but really it’s a description. Reducevg sends the equivalent of TRIM commands, but on a storage array, this is writing nulls. On a big LUN, or with a busy array, this can take a long time. If you do not need to worry about this, then you can disable that space reclaim.

ioo -o -dk_lbp_enabled=0

Here is the IBM doc about it.

 

IJ23045: REDUCEVG UNCLEAR ON DELAY WHEN WAITING FOR INFLIGHT RECLAIM REQ APPLIES TO AIX 7100-05

 

A fix is available

Obtain the fix for this APAR.

APAR status

  • Closed as program error.

Error description

  • reducevg may be unclear, why there is some delay
when waiting on inflight reclaim requests.

Local fix

  • Disable space reclamation by running:
ioo -o dk_lbp_enabled=0

Problem summary

  • reducevg may be unclear, why there is some delay
when waiting on inflight reclaim requests.

Problem conclusion

  • reducevg displays message incase there are space reclamation
IOs inflight to indicate reducevg may take some time to
complete.

SVC, StorWize, FlashSystem, Spectrum Virtualize – replace a drive

Posted by xaminmo

When you replace a drive on one of these, mdisk arrays do not auto-rebuild.

If the GUI fix procedures go away, or never show up, or whatever causes the replacement drive to not get included as a new drive in the mdisk, you can do this manually.

 

First, look for the candidate or spare drive you want to use.

lsdrive | grep -v member

 

Then, make sure that drive ID is a candidate:

chdrive -use candidate 72

 

Then, find the missing member:

lsarraymember mdisk1 | grep -v exact

 

Then, set the new drive to use that missing member ID:

charraymember -member 31 -newdrive 72 mdisk1

 

You can watch the progress of the rebuild:

lsarraymemberprogress mdisk1