Synopsis The remote Oracle Linux host is missing a security update. Description From Red Hat Security Advisory 2010:0518: An updated scsi-target-utils package that fixes multiple security issues is now available for Red Hat Enterprise Linux 5.
I found this great definition of the SCSI3-PR on “dba-oracle.com”
“SCSI-3 PR, which stands for Persistent Reservation, supports multiple nodes accessing a device while at the same time blocking access to other nodes. SCSI-3 PR reservations are persistent across SCSI bus resets or node reboots and also support multiple paths from host to disk. For SCSI-2 disks, reservations are not persistent which means they do not survive node reboots.
SCSI-3 PR uses a concept of registration and reservation. Systems that participate, register a key with SCSI-3 device. Each system registers its own key. Then registered systems can establish a reservation. With this method, blocking write access is as simple as removing registration from a device. A system wishing to eject another system issues a pre-empt and abort command and that ejects another node. Once a node is ejected, it has no key registered so that it cannot eject others. This method effectively avoids the split-brain condition. ”
- When this timer expires, the SCSI layer will quiesce the host bus adapter (HBA) and wait for all outstanding commands to either time out or complete. Afterwards, the SCSI layer will activate the driver's error handler. When the error handler is triggered, it attempts the following operations in order (until one successfully executes).
- Scsioptions- The value scsioptions is a setting for SCSI options included as outlined in the bit meaning table above. Solaris 7 default SCSI settings are for the maximum Ultra Wide Speed. Since the /etc/system file can also affect other disks in the system, consider the effects of implementing the scsioptions=0x7F8 mask on the other disks.
- To determine the SCSI bus name-instance for each tape device, you must install the Oracle Secure Backup Solaris device driver, and then view the devices that were recognized by the driver and associate them with the tape device information gathered in the first step.
To enable the SCSI3_Persistent_Reserve bit on Symmetrix/DMX for Oracle RAC (or any instance where mutliple hosts need to have simultanious access to volumes)
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In “configure.txt” on your Solutions Enabler host.
set device 0090 attribute=SCSI3_persist_reserv;
then from the command line:
# symconfigure -sid 1234 -f configure.txt preview
# symconfigure -sid 1234 -f configure.txt commit
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Simple. To verify that it was set, run the following:
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# symdev -sid 1234 show 0090
And among the output you’ll find the following:
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SCSI-3 Persistent Reserve: Enabled
You can then configure RAC.