HP VMA-series Memory Arrays Oznámení stáhnout pdf (Strana 14)

Currently only 512B sectors are supported

While the VMA SAN Gateway will allow creation of LUNs with either a 512B or 4KB sector size,

only 512B sector size has been fully tested and supported with the gateway. LUNs using 4KB sectors

have not been fully validated and are not considered supported by HP at this time.

Tune OS I/O queue depth settings for optimal performance

Refer to and follow the guidelines for setting OS specific I/O queue depth for I/O to the VMA SAN

Gateway. If the I/O queue depth settings are too high, you might experience the following due to the

SAN Gateway or VMA array being overwhelmed with I/O requests:

 Queue-Full SCSI status

 SCSI Check Condition: Sense Key=0x06 ASC/ASCQ=0x29/0x07 (Nexus Lost)

 I/O time outs resulting in host initiated I/O aborts

 Incomplete CDB Status 0x400 - when an I/O times out before it can be sent

 Target Ports going offline and then coming back online

 Duplicate sessions (see „Known Problems‟ section)

When you see the above messages, try lowering the current LUN queue depth or TPCC settings to see

if with additional tuning the diagnostic messages are no longer encountered. Usually the above

diagnostic messages and other issues result from connected host servers exhausting the available I/O

resources on the VMA SAN Gateway.

Increased I/O traffic from server reboot might cause reported path

offline

As with all storage, when a connected host server reboots there is additional I/O activity that can be

higher than normal I/O traffic volume. This added I/O traffic from a server reboot might cause some

I/Os to the SAN Gateway to time out and might be reported as a path being offline or failing. In

such cases, I/Os are retried by the host server and the path is detected as back online shortly

thereafter.

VMA v-commands available with the Gateway CLI

A number of the VMA Array “v” commands are also available with the Gateway CLI:

 vspeedtest (performs a quick test of read speed with the array)

 vincident collects information on attached arrays

 vmesg lists the debug messages on the Gateway

 vvimms, varray, veeprom, vinfo provide configuration information on the array

 vstat displays array status

 vpartial shows partial/unaligned array I/O counters

 vcounts displays array I/O counts

 vzero resets the array I/O counters

Setting date and time

It is recommended to set the correct date and time on your VMA SAN Gateway and VMA-series array

when initially installed and configured. Setting the correct date and time will help with correlation

and analysis of host server, gateway and array events if a problem is reported.

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HP VMA-series Memory Arrays Oznámení Strana 14