http://wiki.docking.org/index.php?action=history&feed=atom&title=How_to_Check_Harddrive_information 2026-04-08T00:24:36Z Revision history for this page on the wiki MediaWiki 1.39.1 http://wiki.docking.org/index.php?title=How_to_Check_Harddrive_information&diff=10139&oldid=prev 2017-06-09T20:56:45Z

<p>a small collection of commands for checking information regarding hard disk sizes, partitions, and capabilities</p> <p><b>New page</b></p><div>Here are several commands that will allow us to check information regarding hard drives. <br /> <br /> ===fdisk: for hdd sizes/partitions===<br /> fdisk is useful for checking the sizes and partitions of hard drives that are connected to a host. Physical hard disks are usually given a name of /dev/sd[a-z]. Using the command as root:<br /> fdisk -l <br /> will provide us information regarding all the physical hard disks that are located on the host and all the partitions that reside on those disks. Non-physical disks are included in the output too.<br /> <br /> You will see devices such as: <br /> Disk /dev/sdc // physical hard disk<br /> Disk /dev/md[0-10] // software raid volume<br /> Disk /dev/mapper/vg_system-lv_root // logical volume<br /> <br /> ===cat /proc/scsi/scsi for actual models of HDDs===<br /> We have a variety of different HDD models we use from various companies. We&#039;ll often encounter an HDD we find to be reliable or a model we want to avoid altogether for the rest of our lives. Since &lt;br /&gt;<br /> we don&#039;t always have physical access to the interior of a machine to check the HDD models, the easiest way to check what model is in a host is to check under /proc/scsi/scsi. <br /> [root@he bulk]# cat /proc/scsi/scsi<br /> Attached devices:<br /> Host: scsi0 Channel: 00 Id: 00 Lun: 00<br /> Vendor: ATA Model: Samsung SSD 840 Rev: BB6Q<br /> Type: Direct-Access ANSI SCSI revision: 05<br /> Host: scsi1 Channel: 00 Id: 00 Lun: 00<br /> Vendor: ATA Model: Samsung SSD 840 Rev: BB6Q<br /> Type: Direct-Access ANSI SCSI revision: 05<br /> Host: scsi2 Channel: 00 Id: 00 Lun: 00<br /> Vendor: ATA Model: WDC WD1000CHTZ-0 Rev: 6A01<br /> Type: Direct-Access ANSI SCSI revision: 05<br /> Host: scsi3 Channel: 00 Id: 00 Lun: 00<br /> Vendor: ATA Model: WDC WD1000CHTZ-0 Rev: 6A01<br /> Type: Direct-Access ANSI SCSI revision: 05<br /> <br /> ===cat /sys/block/sd*/queue/rotational check if HDD/SSD===<br /> If you&#039;re not sure whether the disks on your system are HDDs or SSDs, do the simple command:<br /> cat /sys/block/sd*/queue/rotational<br /> The output is in descending order starting from the first disk detected, usually sda. <br /> <br /> This will output either 0 or 1.<br /> 0 == SSDs<br /> 1 == HDDs<br /> <br /> Example: <br /> # My first disk is an SSD<br /> [root@he fast]# cat /sys/block/sda/queue/rotational <br /> 0<br /> <br /> # I have two SSDs, /dev/sda &amp; /dev/sdb, and two HDDs /dev/sdc &amp; /dev/sdd<br /> [root@he fast]# cat /sys/block/sd*/queue/rotational <br /> 0<br /> 0<br /> 1<br /> 1<br /> <br /> <br /> [[Category:Sysadmin]]</div>

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