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QUICKCOPY TAPE DUPLICATION SYSTEM DRIVER
QUICKCOPY TAPE DUPLICATION SYSTEM FULL
QUICKCOPY TAPE DUPLICATION SYSTEM WINDOWS

It also dismounts and reallocates media between duplications, leading to large amounts of time being wasted where data isn't being written. This leads to a buildup of jobs in the queue which can prevent backup, restore, and other jobs from going active, leading to status 196s. There may also be smaller batches of images submitted if the 30 minute timer is reached to force a small duplication. With the default parameters, there would be a separate duplication job for any images larger than 25 GB.

MAX_MINUTES_TIL_FORCE_SMALL_DUPLICATION_JOB 30.

The defaults which are most relevant in duplication performance are listed below. If the file doesn't exist on the master server (/usr/openv/netbackup/db/config/LIFECYCLE_PARAMETERS for 7.5 and older) then the default values are being used. Next, the SLP parameters (7.6) or LIFECYCLE_PARAMETERS (7.5 and older) values should be considered. Do not allocate more drives for duplication where data cannot be read fast enough from the source storage unit. Note: Allocate tape drives for duplication where the combined write speed is as close as possible to the average read speed from disk. This back and forth motion is known as shoe-shining and significantly increases drive wear, shortening the life span of the drive. If using dedicated storage units for duplication, the "max write drives" parameter can be used to control how many drives can be used at any given time to better control this.

QUICKCOPY TAPE DUPLICATION SYSTEM FULL

When the next buffer is full and data can be written again, the drive must reposition the tape back to where it last wrote.

The slower read performance from MSDP will cause the tape write buffer to empty faster than it can be filled. The current capacity and maximum theoretical write speeds are listed below for some tape drive generations.įor example, if a given MSDP storage server can rehydrate at 100 MB/sec on average, it would be impractical to allocate four LTO4 drives for duplication use which can write at a combined 480 MB/sec. Knowing the max write speed of the tape drive in relation to the source storage unit IO ( read speed) can help in determining the number of drives that could be allocated to the storage unit. To optimize duplications to tape, the generation of the tape/drive needs to be known. These should be tuned based on the backup/duplication load, available hardware, and server resources. The default SLP/lifecycle parameters and other resource management settings are not optimized in a way that makes best use of tape hardware. No error is directly caused by poor duplication performance, but some indirect failures could include: should be explored in combination with these steps.

QUICKCOPY TAPE DUPLICATION SYSTEM DRIVER

Any possible hardware issues, driver updates, storage file system issues, etc. This article covers tuning Storage Lifecycle Policy (SLP)/lifecycle parameters, IO streams, job limits, SLP windows, and other resource management methods optimize disk to tape duplication performance.

QUICKCOPY TAPE DUPLICATION SYSTEM WINDOWS

Backup jobs running out of time in the start windows status 196s.

Duplication to tape from disk storage units such as AdvancedDisk, MSDP, and other OST technologies may not be performing optimally.