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Full Discussion: AIX hard disk failure
Operating Systems AIX AIX hard disk failure Post 303031756 by Phat on Tuesday 5th of March 2019 11:14:52 AM
Old 03-05-2019
Hi Bakunin,

Code:
rmdev -Rl hdisk5
cfgmgr

We can remove it actually? and can be rediscovered? So this action is just delete the device file, not the data?

Code:
We have pulled out the failure disk pdisk5 and added a new hard disk.

In the first, the newly added disk is recognized as a hdisk1. Then I format it with
Code:
Create an Array Candidate pdisk and Format to 522 Byte Sectors

then it becomes the array candidate pdisk5. Then I use.
Code:
Add Disks to an Existing PCI-X SCSI Disk Array

The disk can be added, but the get the warning such as: the disk is not used for parity and not restriped". I have not captured the exact output.
--> this means that the new disk is only used for data and not used for parity checks and stripped data like Raid 5 behavior?

I though I should try with this first instead of "Add disks to an existing ..." . As after adding, the re-contruct option is not effective.
Code:
Reconstruct a PCI-X SCSI Disk Array

Here is the menu-list command:
Code:
  List PCI-X SCSI Disk Array Configuration
  Create an Array Candidate pdisk and Format to 522 Byte Sectors
  Create a PCI-X SCSI Disk Array
  Delete a PCI-X SCSI Disk Array
  Add Disks to an Existing PCI-X SCSI Disk Array
  Configure a Defined PCI-X SCSI Disk Array
  Change/Show Characteristics of a PCI-X SCSI Disk Array
  Reconstruct a PCI-X SCSI Disk Array
  Change/Show PCI-X SCSI pdisk Status
  Diagnostics and Recovery Options

I followed this for what I have done
IBM Knowledge Center Error

And this for rebuild -->PCI-X SCSI RAID Controller Reference Guide for AIX. Actually not having the chance to use it as mentioned above.
IBM Knowledge Center Error

You have any idea for this?

So just wonder, as recommended by you, we should unmount all devices/filesystems, but do this mean downtime also in application and not really the "hot-swap". In what case we can do an online replacement? As read, the disk is hot-swap, it can be done online, right? Please advise.

--- Post updated at 04:04 PM ---

Note: I have edited my post.

--- Post updated at 04:14 PM ---

If you look at the pdisks in the raid5 pdisk5
Code:
hdisk5    04-08-ff-0,1  Optimal     RAID 5 Array     714.3GB
 pdisk2   04-08-00-5,0  Active      Array Member     142.8GB
 pdisk8   04-08-00-8,0  Active      Array Member     142.8GB
 pdisk4   04-08-01-3,0  Active      Array Member     142.8GB
 pdisk3   04-08-01-5,0  Active      Array Member     142.8GB
 pdisk7   04-08-01-8,0  Active      Array Member     142.8GB
 pdisk5   04-08-01-4,0  Active      Array Member     142.8GB

We can see it has 6 pdisks: 6x142.8=856.8 GB
But with Raid5, we have total size=total disk -1 means 5x142.8=714GB. It matched with 714.3 GB above.

So the OS should recognize the hdisk5 and its VG is 714GB instead of only 540GB
Code:
xxx@/#lsvg -p SSAMvg
SSAMvg:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk5            active            532         45          00..00..00..00..45


xxx@/#lsvg  SSAMvg
VOLUME GROUP:       SSAMvg                   VG IDENTIFIER:  00096f540000d7000000015371bd6d50
VG STATE:           active                   PP SIZE:        1024 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      532 (544768 megabytes)
MAX LVs:            256                      FREE PPs:       45 (46080 megabytes)
LVs:                8                        USED PPs:       487 (498688 megabytes)
OPEN LVs:           8                        QUORUM:         2
TOTAL PVs:          1                        VG DESCRIPTORS: 2
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         1                        AUTO ON:        yes
MAX PPs per VG:     32512
MAX PPs per PV:     1016                     MAX PVs:        32
LTG size (Dynamic): 256 kilobyte(s)          AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable

 

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