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Storage

1. Maintenance

SMART provides statistics of disk firmware, this system handle errors has their occur. Badblocks are detected by writing and reading from disk in a destructive test. Example of how to view SMART statistics of a disk;

        # smartctl -t long /dev/sdb1
        # smartctl -a /dev/sdb1 | less

Mechanical hard drives spindown disks and put heads in hold position to save energy and protect the disk. This spindow spinup can shorter the life expectancy of the hard drive. Relevant output from hdparm;

        # hdparm -I /dev/sda | grep "Advanced power management level"
        # hdparm -I /dev/sda | grep "Recommended acoustic management value"

Settings with hdparm [options] [device];

-B: Set the Advanced Power Management feature. Possible values are between 1 and 255, low values mean more aggressive power management and higher values mean better performance. Values from 1 to 127 permit spin-down, whereas values from 128 to 254 do not. A value of 255 completely disables the feature.
-S: Set the standby (spindown) timeout for the drive. The timeout specifies how long to wait in idle (with no disk activity) before turning off the motor to save power. The value of 0 disables spindown, the values from 1 to 240 specify multiples of 5 seconds and values from 241 to 251 specify multiples of 30 minutes.
-M: Set the Automatic Acoustic Management feature. Most modern hard disk drives have the ability to speed down the head movements to reduce their noise output. The possible value depends on the disk, some disks may not support this feature.

        # hdparm -S 0 /dev/sda
        # hdparm -B 255 /dev/sda

Set persistent values using udev, edit /etc/udev/rules.d/69-hdparm.rules;

        ACTION=="add", SUBSYSTEM=="block", KERNEL=="sda", RUN=="/usr/bin/hdparm -B 255 -S 0 /dev/sda"

Search for bad blocks using non destructive test;

        # badblocks -nsv /dev/sdb1

2. Moving data

Temp partition with 20M-50M;

        (parted) mkpart primary ext4 4000MiB 4050MiB

Ports partition with 120G allows to host sources, package backups and ports;

        (parted) mkpart primary ext4 192000MiB 312000MiB

Reboot into single-user mode where services aren't started and networking is offline.

        # init 1

Copy the data:

        # cp -apx /srv/* /mnt/srv

Rename directory, for later backup;

        # mv /srv /srv.old
        # mkdir /srv

Edit the /etc/fstabfile:

        # Temporary Data /tmp
        UUID=50bf6e55-6461-4dd4-b315-65b53cac0995 /tmp            ext4    defaults,nodev,nosuid,noexec	0	0

        # Server Data /srv
        UUID=6fadcb98-e442-4af7-a5f2-1ddb6100a8c4 /srv            ext4    defaults        0       2

        # Ports Data /usr/ports
        UUID=d1df6743-d3cb-4d5a-badb-96cef3181095 /usr/ports       ext4    defaults,nodev,nosuid,noexec	0       0

Reboot in normal mode.

2. Resize filesystem

If partition is using lvm read lvm resize, if you are using qemu images read resize images

        # resize2fs /dev/sda3
        # e2fsck /dev/sda3

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