Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 28)

Chapter 1. Introducing the LSI 3ware SATA+SAS RAID Controller Card
16 3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.2
• Error Correction . Bad sectors can be dynamically repaired through error
correction (Dynamic Sector Repair). Reallocation of blocks is based
intelligently on the location of the block in relation to the stripe.
• Scheduled Background Tasks. Initialize, rebuild, verify, and self-test
tasks can all be run in the background, at scheduled times. This task lets
you choose a time for these tasks to be run when it will be least disruptive
to your system. You also can define the rate at which background tasks
are performed, specifying whether I/O tasks should be given more
processing time, or background rebuild and verify tasks should be given
more processing time. (For more information, see “Scheduling
Background Tasks” on page 163.)
• SMART Monitoring. Self-Monitoring, Analysis and Reporting
Technology (SMART) automatically checks the health of SATA and SAS
disk drives every 24 hours and reports potential problems. This allows
you to take proactive steps to prevent impending disk crashes. SMART
data is checked on all disk drives (array members, single disks, and hot
spares). Monitoring of SMART thresholds can be turned on and off in
3DM2. For more information, see “Selecting Self-tests to be Performed”
on page 168 and “Viewing SMART Data About a Drive” on page 144.
• Staggered Spinup. Staggered spinup allows drives that support this
feature to be powered-up into the standby power management state to
minimize in-rush current at power-up and to allow the controller to
sequence the spin-up of drives. Both SATA-2 OOB and ATA spin-up
methods are supported. The standby power management state is persistent
after power-down and power-up. You can set the number of drives that
will spin up at the same time, and the time between staggers in 3BM and
CLI. For more details, see Table 5 on page 32.
This feature does not apply
to drives that are attached to an expander. For details, see “Enabling and
Setting Up Staggered Spin-up” on page 74.
• StorSave ™ Profiles allow you to set the level of protection versus
performance that is desired for a unit when write cache is enabled. (For
more information, see “Setting the StorSave Profile for a Unit” on
page 111.)
• Verification and Media Scans. The verify task verifies all redundant
units, and checks for media errors on single disks, spares and RAID 0 unit
members. If the disk drive is part of a redundant unit, error locations that
are found and are deemed repairable are rewritten with the redundant
data. This forces the drive firmware to reallocate the error sectors
accordingly. (For more information, see “About Verification” on
page 149.)
• Read Cache. Two read cache settings are available. Basic Read Cache
stores data from media locally on the controller to improve read access
times for applications. The 3ware Read Cache feature also includes an
Intelligent Mode, which enables intelligent read prefetch (IRP). IRP