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Full Discussion: SAS or SSD for Ubuntu 14.04 and data analysis
Special Forums Hardware SAS or SSD for Ubuntu 14.04 and data analysis Post 302966538 by bakunin on Saturday 13th of February 2016 06:28:44 AM
Old 02-13-2016
Not directly related but i had a longer workshop yesterday about our new storage system (EMC VMax 200k). EMC claims that they had intended the 300GB 15k-SAS drives for high-performance, but phase them out now because (quoting from memory) with the development of Flash-SSDs its just not worth it any more. They also claim that, because they use SLC-based hardware, they have even lower rates of disk-replacement, even in heavy-duty transactional storage systems, than with rotational disks, to which a much lower energy consumption of the SSDs compared to the 15k-SAS disks contributes. There is simply less heat involved and that shows when you pack some ~2500 disks into a rack.

You haven't said where you are going to place the workstation, but in case it is going to be somewhere near your desk: 15k-disks are awefully LOUD in addition to be premier heating devices while SSDs are completely silent.

I hope this helps.

bakunin
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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)
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