G06.27 Software Installation and Upgrade Guide

Overview of Installing G06.27
G06.27 Software Installation and Upgrade Guide—540067-001
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Installing an IOAM Enclosure and Other
Components
To connect an IOAM enclosure to a NonStop S-series system in a group other than
group 01, you must ensure that:
•
The Maintenance Entity firmware version on the ServerNet switch board is at least
T2805AAD.
•
The SP firmware version on the NonStop S-series system is T1089ABR.
If you need to update the firmware to meet these levels, do so before you move the
IOAM enclosure to a group other than 01.
If the IOAM enclosure has not been connected to the NonStop S-series system
enclosure yet, connect a system console to the IOAM enclosure and use the OSM
Low-Level Link to update the firmware and perform a module preparation (using
the Configure Module dialog box) before connecting it to the NonStop S-series
system.
Migrating Existing Data to ESS
The migration of existing data from internal SCSI-attached, 514-byte sector disks to
industry standard, 512-byte sector disk subsystems includes an improved method for
checksum protection. The new checksum protection method employed for unstructured
files requires the data stored on disk be contiguous and aligned in units of 28 KB.
When a non-partitioned unstructured file is created or migrated to ESS, the extent
sizes are rounded up to a mod-14 boundary, because an extent page is 2 KB. This
ensures continuity of the data set protected by the checksum. This design ensures the
best possible performance for unstructured files, without adding significant overhead
for checksums. Each 28 KB of data is protected with a 4-KB check block, which
contains the checksum information.
Partitioned unstructured files cannot be migrated to an ESS without first performing a
migration of all partitions of the unstructured file set to a mod-14 extent boundary.
Partitioned unstructured files must use the same extent size and maximum extents for
all partitions because positioning is dependent upon a consistent size for each of the
partitions. Online migration attempts abort when an unstructured partitioned file without
mod-14 extent sizes is present on the source disk.
Before migrating to ESS, rebuild all partitions, using a mod-14 extent size. To rebuild,
use an offline copy to a new partition set.
The FCHECK utility (introduced in G06.24) includes a migration option that reports that
the files that cannot be migrated to ESS because of this format limitation, in addition to
reporting the amount of disk space required for check block protection.