xVault xNVR200/300/400 User Guide V2.0.0
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7. the system will issue a confirmation request one
more time. Click
Yes
to continue.
CaUTiON:
the expansion of a RaID set, even if only a single drive will take as long if not longer than the initial RaID build.
It is Seneca’s recommendation that RaID expansions only be done at a one, two or three drive count with NO data activity
from the system. a new RaID set should be considered as an alternative for four or more drives.
e. CONFiGUriNG reBUiLd, reCONsTrUCTiON and BGi raTes
1. Open MegaRaID Storage Manager
2. Right click on RaID controller holding the array. Select
set adjustable Task rates.
Change tasks percentages. Percentages
represent a portion of total array performance. So a Rebuild Rate of 50% will detract 50% of the arrays available performance to
process video streams. In turn the RaID set will rebuild faster than if set to 10%.
reBUiLd & reCONsTrUCTiON raTe
this is the rate at which a replacement drive will rebuild as a percentage of total IO and bandwidth available to the array. a lower per-
centage will take longer for the replacement drive to fully restore. However this slower rebuild rate will be less likely to impact video
stream writes. a higher percentage will complete the replace drive restore faster but create a stronger possibility of lost video and
would be presented as missed frames.
Rebuild and Reconstruction rates should be set at the same percentage.
PaTrOL raTe
Patrol is a function of the RaID controller to check RaID set integrity. Patrol Reads do impact the arrays performance. there is
another RaID set integrity check called “Check Consistency”. leaving “Check Consistency” in place and reducing Patrols to zero will
suffice in maintaining array integrity.
BGi raTe
Is the rate at which a new RaID set will initialize while other IO operations are in place. Setting this value to an extreme low may be
tempting. But consider if a RaID set would take 12 hours to initialize without any external IO, it would take 60 hours to initialize with a
setting of 20% and consistent external IO influence.
