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Operating Systems Linux Red Hat Is overlapping two RAID5 arrays on same drives a bad idea ?? Post 302527701 by mark54g on Saturday 4th of June 2011 05:21:45 PM
Old 06-04-2011
Well, unless you are actually planning on using the xen functions, I would personally use the vanilla kernel.

The other options, I feel would be to use the 500GB drives in RAID 5 (chunk size should depend on the size of the majority of your files and the type of file system.

For the 1TB drives, a RAID 1E might make more sense. The issue is not only about the speed of the drives in optimal state, but how quickly you can recover from a failure before another read failure causes data loss. RAID 1/10/1E call for a simple copy, where RAID 5 and 6 usually call for an xor checksum.

With larger and larger drives, and the long time to get spares, a failure can easily go through more than one drive and cause data loss.

You may also want to consider using something like DRBD to another machine, instead of just amanda if your data is critical. Alternately, unison works well when the environment is mixed.
 

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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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