ssh key hashing in UNIX

process:-

root@nosxprrsnp1:~/.ssh# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
13:65:6c:dc:35:f0:91:f6:18:a2:a9:11:31:a5:b1:37 root@nosxprrsnp03
root@nosxprrsnp2:~/.ssh# cat /root/.ssh/id_rsa.pub | ssh root@10.22.3.241 "cat - >> /.ssh/authorized_keys"
Password:root@nosxprrsnp03:~/.ssh# ssh 10.22.3.241
Last login: Wed Nov 20 15:16:49 2013 from 192.168.41.35
Oracle Corporation      SunOS 5.10      Generic Patch   January 2005
You have new mail.

new concept in vmax : zero space reclamation

Zero space reclamation is an extension of the existing Virtual Provisioning space de-

allocation mechanism.  Previous versions of Enginuity and Solutions Enabler allowed 

the reclamation of allocated but unused thin device space from a thin pool.  

Administrators now have the ability to reclaim all-zero space, including both host-

unwritten extents/chunks and chunks that contain all zeros due to file system or 

database formatting methods.  The space reclamation process is non-disruptive and 

can be executed with the targeted thin device ready and read/write to operating 

systems and applications.   

Starting the space reclamation process will spawn a back-end disk director (DA) task 

that will examine the allocated thin device extents on specified thin devices.  A thin 

device extent is 768 KB (or 12 tracks) in size and is the default unit of storage at 

which data is allocated for a thin device.  For each allocated extent, all 12 tracks will 

be brought into Symmetrix cache and examined to see if they contain all zero data. If 

the entire extent contains all zero data, the extent will be de-allocated and added 

back into the pool, making it available for a new extent allocation operation.  Should 

any portion of the extent contain non-zero data, none of the extent will be reclaimed.

symconfigure -cmd "start reclaim on tdev 36d;" commit -sid 769

symcfg show -thin -pool FC -detail -sid 769 –gb

symcfg verify -tdev -reclaiming -dev 36d -sid 769