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SAS or SSD for Ubuntu 14.04 and data analysis
Post 302966368 by cmccabe on Thursday 11th of February 2016 09:00:36 AM
02-11-2016
SAS or SSD for Ubuntu 14.04 and data analysis
I am in the process of building a workstation and have a question related to performance. I am a scientist who deals with big data (average file size 30-50gb). My OS is ubuntu 14.04 and so far I have a 128gb dual xeon E5-2630 with 6 cores each. I/O buffering is an issue so I am adding a 256/512? PCIe card and either 2 SSD or SAS drives for the OS and software. Since the PCIe will be separate its main purpose will be for file transfer, so would a SAS or SSD be a better fit for the OS? I am leaning towards SAS for the buffering issue, but wanted to ask more knowledgeable users. I forgot to mention that there will be a separate 1 or 2TB drive. Any recommendations for the size of the SAS or SSD? Thanks 
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LEARN ABOUT OPENSOLARIS
mega_sas
mega_sas(7D) Devices mega_sas(7D) NAME
mega_sas - SCSI HBA driver for LSI MegaRAID SAS controller DESCRIPTION
The mega_sas MegaRAID controller host bus adapter driver is a SCSA-compliant nexus driver that supports the Dell PERC 5/E, 5/i, 6/E and 6/i RAID controllers, the IBM ServeRAID-MR10k SAS/SATA controller and the LSI MegaRAID SAS/SATA 8308ELP, 8344ELP, 84016E, 8408ELP, 8480ELP, 8704ELP, 8704EM2, 8708ELP, 8708EM2, 8880EM2 and 8888ELP series of controllers. Supported RAID features include RAID levels 0, 1, 5, and 6, RAID spans 10, 50 and 60, online capacity expansion (OCE), online RAID level migration (RLM), auto resume after loss of system power during arrays, array rebuild or reconstruction (RLM) and configurable stripe size up to 1MB. Additional supported RAID features include check consistency for background data integrity, patrol read for media scanning and repairing, 64 logical drive support, up to 64TB LUN support, automatic rebuild and global and dedicated hot spare support. CONFIGURATION
The mega_sas.conf file contains no user configurable parameters. Please configure your hardware through the related BIOS utility or the MegaCli configuration utility. If you want to install to a drive attached to a mega_sas HBA, you should create the virtual drive first from the BIOS before running the Solaris install. You can obtain the MegaCli utility from the LSI website. The mega_sas device can support up to 64 virtual disks. Note that BIOS numbers the virtual disks as 1 through 64, however in the Solaris operating environment virtual disks are numbered from 0 to 63. Also note that SAS and SATA drives cannot be configured into the same vir- tual disk. KNOWN PROBLEMS AND LIMITATIONS
The mega_sas driver does not support the LSI MegaRAID SAS 8204ELP, 8204XLP, 8208ELP, and 8208XLP controllers. FILES
/kernel/drv/mega_sas 32-bit ELF kernel module. (x86) /kernel/drv/amd64/mega_sas 64-bit kernel module. (x86) /kernel/drv/mega_sas.conf Driver configuration file (contains no user-configurable options). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Architecture |x86-based systems | +-----------------------------+-----------------------------+ |Availability |SUNWmegasas | +-----------------------------+-----------------------------+ |Interface stability |Uncommitted | +-----------------------------+-----------------------------+ SEE ALSO
prtconf(1M), attributes(5), sata(7D), scsi_hba_attach_setup(9F), scsi_sync_pkt(9F), scsi_transport(9F), scsi_inquiry(9S), scsi_device(9S), scsi_pkt(9S) Small Computer System Interface-2 (SCSI-2) SunOS 5.11 14 Aug 2008 mega_sas(7D)