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Operating Systems Linux Help Setting up Linux Raid Server Post 302518456 by DGPickett on Friday 29th of April 2011 04:54:35 PM
Old 04-29-2011
Often, the bootstrap is on a simple disk, and the RAID is dedicated to the application. For software RAID, I wonder if that is a requirement, since you need to boot the software to get it together. Remember that raid5 is not churn-friendly or small-block-random efficient, so many shops put high-churn and small block-random data on mirrors, sometimes striped for more bandwidth. Also, the controller(s) can be a bottleneck. Even with lots of RAM, random operations on large data sets will fill RAM uselessly, and fsync() of RDBMS Commit and other critical files (postfix email) waits for magnetic completion. A shot of SSD might be a great complement. Sometimes, you can shadow the SSD with RAID5 hierarchically, so only the most accessed bits move to SSD. Too much modified data in RAM in a liability!
 

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lsimega(7D)															       lsimega(7D)

NAME
lsimega - SCSI HBA driver for LSI MegaRAID 320-2x SCSI RAID Controller The lsimega SCSI RAID host bus adapter driver is a SCSA-compliant nexus driver that supports LSI MegaRAID 320-2x SCSI RAID devices. The lsimega driver supports standard functions provided by the SCSA interface, including RAID disk I/O and passthrough I/O to support SCSI tape and CDROM. DRIVER CONFIGURATION
The lsimega.conf file contains no user configurable parameters. Please configure your hardware through BIOS. The LSI MegaRAID 320-2x device can support up to 40 logic drivers. Note that BIOS numbers the logic drives as 1 through 40, however in Solaris these drives are numbered from 0 to 39. See attributes(5) for a description of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability | | +-----------------------------+-----------------------------+ FILES
/kernel/drv/lsimega 32-bit ELF kernel module. /kernel/drv/amd64/lsimega 64-bit kernel module ( only). /kernel/drv/lsimega.conf Driver configuration file (contains no user-configurable options). prtconf(1M), attributes(5), amr(7D), scsi_hba_attach(9F), scsi_sync_pkt(9F), scsi_transport(9F), scsi_inquiry(9S), scsi_device(9S), scsi_pkt(9S) Small Computer System Interface-2 (SCSI-2) 20 April 2005 lsimega(7D)
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