Hp Storage Mirroring Software User Manual download pdf (Page 530)

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l Select a dedicated, physical, non-boot volume.

l Select a location on a non-clustered volume that will have minimal

impact on the operating system and applications being protected.

l Select a location that is on a different volume as the location of the

Windows pagefile.

l Do not select the root of a volume.

l Do not select the same physical or logical volume as the data being

replicated.

Although the read/write ratio on queue files will be 1:1, optimizing the disk for

write activity will benefit performance because the writes will typically be

occurring when the server is under a high load, and more reads will be

occurring after the load is reduced. Accordingly, use a standalone disk,

mirrored (RAID 1) or non-parity striped (RAID 0) RAID set, and allocate more

I/O adapter cache memory to writes for best performance. A RAID 5 array will

not perform as well as a mirrored or non-parity striped set because writing to

a RAID 5 array incurs the overhead of generating and writing parity data.

RAID 5 write performance can be up to 50% less than the write performance

of a single disk, depending on the adapter and disk.

The best queuing performance can be accomplished by using a RAM-based

solid state disk as the queue device. Solid state disks are hard drives that

use RAM or flash memory instead of disk platters. The flash-based devices

typically do not have adequate throughput to use as a queue device. RAM-

based devices are typically quite costly, but they will provide superior

performance as a queuing device when the best performance is required.

Note: Scanning the Storage Mirroring Recover queue files for viruses can

cause unexpected results. If anti-virus software detects a virus in a

queue file and deletes or moves it, data integrity on the target cannot

be guaranteed. As long as you have your anti-virus software

configured to protect the actual production data, the anti-virus software

can clean, delete, or move an infected file and the clean, delete, or

move will be replicated to the target. This will keep the target from

becoming infected and will not impact the Storage Mirroring Recover

queues.

l Maximum system memory for queue—This is the amount of Windows

system memory, in MB, that will be used to store data in queues. When

exceeded, queuing to disk will be triggered. This value is dependent on the

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