This gives organizations the flexibility of redundancy
for users that may have a higher SLA, without incurring the cost of doubling the disk for the entire
server. The passive copy should use its own dedicated set of disks to prevent performance problems.
Using iSCSI storage for the passive storage is not recommended because iSCSI connects over a local or
wide area network and may not provide enough bandwidth or low latency. It is critical to maintaining
high availability that log shipping stay up to date, and this configuration makes it difficult to predict
bandwidth usage impact from other applications.
Another best practice is to use volume mount points for database and log LUNs. A LUN is a disk
volume, typically made from multiple physical disks configured in an array. Most administrators are
familiar with volumes as drive letters. Instead of using drive letters for disk volumes, mount points
allow LUNs to be mounted into a folder on a different physical disk. Instead of mounting each storage
group LUN with drive letters, first create a small root directory with a drive letter and a folder; for
example, a small 1 - gigabyte volume assigned a drive letter K: and a root folder Storage Groups . Then
mount the storage group LUN to the K:\Storage Groups folder. In this example, the LUN for storage
group one would be K:\Storage Groups\SG1 .
Pages:
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472