Q. How do I find out my SCSI hard disk RPM speed from a Linux shell prompt without opening my server case? How do I find out hard disk model and serial number from a shell prompt?
A. A typical desktop hard disk rotate at 7,200 revolutions per minute (RPM). A typical server hard disk spin at 10,000 or 15,000 rpm to achieve sequential media transfer speeds. You can use hard disk model number to obtain disk RPM. For example, a typical Seagat disk Model # ST373455SS can provide following information:
- ST – Brand identity
- 3 – Form Factor (3 = 3.5″)
- 73 – Disk size / Capacity in GB i.e. 73GB
- 4 – Reserved for future use
- 5 – RPM ( 5 = 15k and 0 = 10K)
- 5 – Generation
- SS – Indicates interface i.e Serial Attached SCSI
How do I find out hard disk model and serial number?
Use any one of the following command from shell prompt to find out hard disk model number:
$ cat /proc/scsi/scsi
OR use scsi_id command to querys a SCSI device via the SCSI INQUIRY vital product data (VPD) page 0x80 or 0x83 and uses the resulting data to generate a value that is unique across all SCSI devices that properly support page 0x80 or page 0x83.
$ /sbin/scsi_id -g -p 0x80 -s /block/sdd
$ sudo grep -i sdd /var/log/boot.log
OR use sginfo / scsiinfo command from sg3_utiles package, enter:
# sginfo -a /dev/sdd | more
scsiinfo or sg3_utils package
sg3_utils is a collection of Linux utilities for devices that use the SCSI command set. You can install by typing following command:
# yum install sg3_utils
If you are using Debian / Ubuntu Linux, enter:
$ sudo apt-get install sg3-utils
Now you can use command sginfo with the -g switch to obtain information about hard disk cylinders, heads and RPM:
# sginfo -g /dev/sdd
Rigid Disk Geometry mode page (0x4) ----------------------------------- Number of cylinders 74340 Number of heads 2 Starting cyl. write precomp 0 Starting cyl. reduced current 0 Device step rate 0 Landing Zone Cylinder 0 RPL 0 Rotational Offset 0 Rotational Rate 15015
Finding out your hard disk RPM speed using manufactures website / product page
Once obtained hard disk model number, directly go to manufactures website and search for model to get detailed information.
- man sginfo
- How Do I interpret DRIVE MODEL NUMBERS?