Skip to main content

How can I view, create, and remove SCSI persistent reservations and keys at REDHAT

from dhelios.blogspot.com


Install scsi 

yum install sg3_utils

To view the keys registered on a LUN use the following command:
$ sg_persist --in -k -d /dev/<DEVICE>
To view the reservations currently out on a device use the following command:
$ sg_persist --in -r -d /dev/<DEVICE>



Keys are 6 or 8 digit HEX numbers. Key numbers can be arbitrary. For example 0xDEADBEEF or 0x123ABC To register a key on a LUN use the following command:
$ sg_persist --out --register --param-sark=<KEY> /dev/<DEVICE>


You can take out a reservation on behalf of a key with the following command:
$ sg_persist --out --reserve --param-rk=<KEY> --prout-type=<TYPE> /dev/<DEVICE>
The reservation types are defined in the SCSI Primary Commands spec. Here are the reservation types from the sg_persist manpage
1-> write exclusive
3-> exclusive access
5-> write exclusive - registrants only
6-> exclusive access - registrants only
7-> write exclusive - all registrants
8-> exclusive access - all registrants.

You can release a registration with this command:
$ sg_persist --out --release --param-rk=<KEY> --prout-type=5 /dev/<DEVICE>
You can unregister a key with this command:
$ sg_persist --out --register --param-rk=<KEY> /dev/<DEVICE>
You can clear the reservation and all registered keys with this command:
# sg_persist --out --clear --param-rk=<KEY> /dev/<DEVICE>

Comments

Post a Comment

Popular posts from this blog

memory error detect XSCF uboot

If you see something like this when you poweron you server: memory error detect 80000008, address 000002d0 data 55555555 -> fbefaaaa capture_data hi fbefaaaa lo deadbeef ecc 1b1b capture_attributes 01113001 address 000002d0 memory error detect 80000008, address 000002d4 data aaaaaaaa -> deadbeef capture_data hi fbefaaaa lo deadbeef ecc 1b1b capture_attributes 01113001 address 000002d4 memXSCF uboot  01070000  (Feb  8 2008 - 11:12:19) XSCF uboot  01070000  (Feb  8 2008 - 11:12:19) SCF board boot factor = 7180     DDR Real size: 256 MB     DDR: 224 MB Than your XSCF card is broked. Replace it with new one. After that it will ask you for enter chassis number - located at front of the server XSCF promt to enter your chasses number ( is a S/N of your server ): Please input the chassis serial number : XXXXXXX 1:PANEL Please select the number : 1 Restoring data from PANEL to XSCF#0. Please wait for several minutes ... setdefaults : XSCF clear : start ......
1 comment
Read more

FOS Password recovery (Brocade Fabric OS Switch Password recovery procedure)

Password recovery using root account If you have access to the root account, you can reset the passwords on the switch to default. This feature is available for all currently supported versions of the Fabric OS. Follow the below steps to reset any account password from the root account. 1. Open a CLI session (serial or telnet for an unsecured system and sectelnet for a secure system) to the switch. 2. Log in as root. 3. At the prompt, enter the passwddefault command as shown below: switch:root> passwddefault 4. Follow the prompts to reset the password for the selected account. For example: switch:root> passwddefault All account passwords have been successfully set to factory default. Once the passwords have been reset, log into the switch as admin, and modify your default passwords. Make sure to keep a hardcopy of your switch passwords in a secure location. The default passwords for Fabric OS switches are: Root fibranne Adminpassword Userpassword Password r
4 comments
Read more

SPARC OBP cheatsheet

Boot PROM Basics Boot PROM(programmable read only memory): It is a firmware (also known as the monitor program) provides: 1. basic hardware testing & initialization before booting. 2. contains a user interface that provide access to many important functions. 3. enables the system to boot from wide range of devices. It controls the system operation before the kernel becomes available. It provides a user interface and firmware utility commands known as FORTH command set. These commands include the boot commands, the diagnostic commands & the commands for modifying the default configuration. Command to determine the version of the Open Boot PROM on the system: # /usr/platform/'uname -m'/sbin/prtdiag -v (output omitted) System PROM revisions: ---------------------- OBP 4.16.4 2004/12/18 05:21 Sun Blade 1500 (Silver) OBDIAG 4.16.4.2004/12/18 05:21 # prtconf -v OBP 4.16.4 2004/12/18 05:21 Open Boot Architectures Standards: It is based on IEEE standard #1275, accord
Post a Comment
Read more