Resetting The Nas Ssh Key For Configuration Communications; Working With Nfs Clients That Fail To Mount Nfs Shares After A Client Ip Change - IBM Storwize V7000 Unified Problem Determination Manual

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The chrootpwd program sets the new root password on both file modules in the
cluster.

Resetting the NAS ssh key for configuration communications

The configuration communications between the Storwize V7000 file modules and
the control enclosure are done by using ssh over the site 1 Gbps Ethernet LAN;
whereas the file data traffic is passed over the direct connect Fibre Channel links
by using the SCSI protocol.
Before you begin
During the USB initialization of the Storwize V7000 Unified system, one of the
node canisters in the control enclosure creates a public/private key pair to use for
ssh. The node canister stores the public key and writes the private key to the USB
flash drive memory.
One of the file modules then takes the private key from the USB flash drive
memory to use for ssh. The file module passes it to the other file module over the
direct connect Ethernet link and then deletes the private key from the USB flash
drive memory so that it cannot be used on the wrong system.
It might be necessary to reset the NAS ssh key in the following circumstances:
v When communications between the Storwize V7000 file module and the
Storwize V7000 control enclosure is not authorized because of a bad key.
v When both Storwize V7000 file modules have lost the original NAS ssh key.
v When the Storwize V7000 control enclosure has lost the NAS ssh key.
About this task
Perform the following steps to reset the NAS ssh key so that the communications
between the file modules and the Storwize V7000 control enclosure resume:
Procedure
1. Log on to the Storwize V7000 control enclosure management CLI as superuser:
satask chnaskey -privkeyfile NAS.ppk
The private key is left in the /dumps directory.
2. Use SCP to copy the private key file to the /tmp directory on the file module
which is currently the active management node:
scp -P 1602 /dumps/NAS.ppk root@<active file module IP>:/tmp
You are prompted for the file module root password.
3. Log on to the Storwize V7000 Unified management CLI as admin:
chstoragesystem --sonasprivkey /tmp/NAS.ppk
Working with NFS clients that fail to mount NFS shares after a
client IP change
Use this information to resolve a refused mount or Stale NFS file handle
response to an attempt to mount Network File System (NFS) shares after a client IP
change.
Chapter 7. Recovery procedures
275

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