pv_monitor.sh fails indicating powervault_monitor.py lines which have failed
search cancel

pv_monitor.sh fails indicating powervault_monitor.py lines which have failed


Article ID: 224646


Updated On:


Security Analytics


The U144 and U844 storage arrays have a firmware update which restricts the MAC and KexAlgorithms which are allowed.  This prevents pv_monitor.sh -S from retrieving the suite of configuration and log files to properly debug drive and other component failures.

You may see something like "no matching MAC found" or "KexAlgorithms diffie-hellman-group16-sha512".  The final line the failure is "0: re.compile(b'Password: ')".



The /etc/ssh/ssh_config file will need to be updated with the required ciphers.  There is no need to restart any services.

  • Update the cipher strings.  The first line to update begins with MACs


MACs hmac-sha1,hmac-sha2-256,hmac-sha2-512


MACs hmac-sha1,hmac-sha2-256,hmac-sha2-512,hmac-sha2-256-etm,hmac-sha2-512-etm
  • The second line to update begins with Kex


KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521


KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group16-sha512,[email protected],curve25519-sha256,diffie-hellman-group-exchange-sha256,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512

Then try the pv_monitor.sh -S again.

Additional Information

Full log output:


pv_monitor.sh -S

Connecting to

Session Established with

Gathering Support Bundle

Connecting to powervault unit through sftp ...

Updating known hosts ...

Traceback (most recent call last):

  File "/usr/local/sbin/powervault_monitor.py", line 434, in <module>


  File "/usr/local/sbin/powervault_monitor.py", line 415, in main


  File "/usr/local/sbin/powervault_monitor.py", line 102, in gather_powervault_support_bundle

    child.expect('Password: ')

  File "/usr/lib/python3.6/site-packages/pexpect/spawnbase.py", line 344, in expect

    timeout, searchwindowsize, async_)

  File "/usr/lib/python3.6/site-packages/pexpect/spawnbase.py", line 372, in expect_list

    return exp.expect_loop(timeout)

  File "/usr/lib/python3.6/site-packages/pexpect/expect.py", line 179, in expect_loop

    return self.eof(e)

  File "/usr/lib/python3.6/site-packages/pexpect/expect.py", line 122, in eof

    raise exc

pexpect.exceptions.EOF: End Of File (EOF). Exception style platform.

<pexpect.pty_spawn.spawn object at 0x7fffeaf7d828>

command: /bin/sftp

args: ['/bin/sftp', '-q', '-o', 'KexAlgorithms diffie-hellman-group16-sha512', '-P', '1022', '[email protected]']

buffer (last 100 chars): b''

before (last 100 chars): b'closed\r\r\nyes\r\n'

after: <class 'pexpect.exceptions.EOF'>

match: None

match_index: None

exitstatus: 255

flag_eof: True

pid: 305292

child_fd: 5

closed: False

timeout: 30

delimiter: <class 'pexpect.exceptions.EOF'>

logfile: None

logfile_read: None

logfile_send: None

maxread: 2000

ignorecase: False

searchwindowsize: None

delaybeforesend: 0.05

delayafterclose: 0.1

delayafterterminate: 0.1

searcher: searcher_re:

    0: re.compile(b'Password: ')