Re: Q: Is SAP ASE Backup Server capable of using huge pages or are they intended just for ASE..?
The setting applies to ASE only. The backup server doesn't buffer gbytes of data, so huge pages wouldn't be very useful.
Q: Does the Linux memory usage for dump/load operations increase when ASE is using huge pages?
No.
The backupserver is it's own separate process that reads from the Sybase data devices independently of the ASE server. So changes to ASE memory usage have no effect on the separate backupserver process.
But there is one scenario where ASE changes affect backupserver memory usage. On Linux installations, if backing up tbytes of data via filesystem devices (ie., buffered by the OS from it's virtual memory pool), you can sometimes start causing virtual memory management problems and/or kernel memory fragmentation problems.
In this situation switching the ASE server to use direct I/O will cause I/O to bypass the OS buffering. In ASE 15.5 and later, if ASE is using direct I/O for a device, the backupserver will (by default) also use direct I/O when reading from that device (see the backupserver utility guide, search for "directio")
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