SAS or SSD for Ubuntu 14.04 and data analysis Post: 302966538

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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

02-13-2016

Registered User

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 ULTRIX

scsi

SCSI(4) Kernel Interfaces Manual SCSI(4)

Name
SCSI - Small Computer System Interconnect

Description
The ULTRIX system interfaces to disk and tape devices through the Small Computer System Interconnect (SCSI). Initial ULTRIX SCSI support
is limited to the Digital-supplied mass storage devices. The following devices are fully supported on the ULTRIX system:

o Winchester disks: RZ22, RZ23, RZ23L, RZ24, RZ55, RZ56, RZ57, RX23, RX26, RX33

o Magnetic tapes: TZ30, TZK50, TLZ04, TSZ05, TKZ08, TZK10

o Optical disks: RRD40, RRD42

Under the ULTRIX operating system, a SCSI device is referred to by its logical name. Logical names take the following form:
nn#
The nn argument is the two-character name; the number sign (#) represents the unit number. The two character names for SCSI devices are:

rz - RZ22, RZ23, RZ23L, RZ24, RZ55, RZ56, RZ57, RX23, RX26, RX33, RRD40, RRD42 disks

tz - TZ30, TZK50, TLZ04, TSZ05, TKZ08, and TZK10 tapes

The unit number is a combination of the SCSI bus number, either 0, 1, ... and the device's target ID number. The unit number is eight
times the bus number plus the target ID. For example, an RZ23 disk at target ID 3 on bus 0 would be referred to as rz3; a TZK50 tape at
target ID 5 on the second SCSI bus would be referred to as 13.

The SCSI bus has eight possible target device IDs. By default, one is allocated to the system. This allows for a maximum of seven target
devices connected to a SCSI bus.

Restrictions
The ULTRIX SCSI device driver does not operate with optical disks, other than the Digital-supplied devices.

The SCSI driver attempts to support on a best effort basis, non-Digital-supplied winchester disks and magnetic tapes.

The following notes apply to the driver's handling of non-Digital-supplied disks:

o These disks are assigned a device type of RZxx, instead of RZ22, RZ23, RZ23L, RZ55, RZ56, RZ57, RX23, RX26, or RX33. The RZxx disks
follow the same logical device naming scheme as the Digital-supplied disks.

o During the autoconfigure phase of the system startup, the driver prints the contents of the SCSI vendor ID, product ID, and the
revision level fields of the inquiry data return by the SCSI device.

o RZxx disks are assigned a default partition table. The default table can be modified by editing the sz_rzxx_sizes[8] entry in the
file The utility can also be used to modify the partition table on a RZxx disk.

o The only logical unit number (LUN) supported for each target ID is 0.