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Description of problem:
The 'sftp' on RHEL6 doesn't have "[-i identity_file]"
option:

[root@sgi-xe250-02 ~]# sftp
usage: sftp [-1Cv] [-B buffer_size] [-b batchfile] [-F ssh_config]
            [-o ssh_option] [-P sftp_server_path] [-R num_requests]
            [-S program] [-s subsystem | sftp_server] host
       sftp [user@]host[:file ...]
       sftp [user@]host[:dir[/]]
       sftp -b batchfile [user@]host


Version-Release number of selected component (if applicable):

[root@sgi-xe250-02 ~]# rpm -q --whatprovides /usr/bin/sftp
openssh-clients-5.3p1-70.el6_2.2.x86_64


How reproducible:
Always

Additional info:
[-i identity_file] is needed by kdump to provide password-less access via sftp.

Either ssh-agent or 'ssh -o' can be used:

$ ssh-copy-id -i .ssh/account_rsa localhost
account@localhost's password: 
Now try logging into the machine, with "ssh 'localhost'", and check in:

  ~/.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

$ ssh-add ~/.ssh/account_rsa
Enter passphrase for /home/account/.ssh/account_rsa: 
Identity added: /home/account/.ssh/account_rsa (/home/account/.ssh/account_rsa)

$ sftp localhost
Connected to localhost.
sftp> 

$ ssh-add -D
All identities removed.

-----------------

$ sftp -o 'IdentityFile ~/.ssh/account_rsa' localhost
Enter passphrase for key '/home/account/.ssh/account_rsa': 
Connected to localhost.
sftp>

Hi, Petr,

-o 'IdentityFile ~/.ssh/account_rsa' works fine for me, thanks for your help!

I am closing this bug as WORKSFORME.