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121 lines
4.2 KiB
Bash
121 lines
4.2 KiB
Bash
#!/bin/bash
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# Get me a set of disks for DRAID
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# DONE [b..y] a[a..x] get slices of X disks and be able to verify with wc -w
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# REQUIRES: seq
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# Trick to put header outside of col -t
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>&2 echo "$0 - 2021 Dave Bechtel"
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>&2 echo "Pass arg1=total disks in pool -- arg2=how many disks per vdev"
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>&2 echo "+ NOTE arg2 ^^ should factor in the RAIDz level 1/2/3 desired to sustain X number"
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>&2 echo "+ of failed disks per vdev + vspares, dont go too narrow or will lose capacity"
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>&2 echo "NOTE output lines should be the same number of devices to balance"
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>&2 echo "PROTIP: Pipe output to column -t to make it look nice"
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# REF: https://tldp.org/LDP/abs/html/arrays.html
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# regular array - STARTS AT 0
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declare -a fullset=(sd{b..y} sda{a..x} sdb{a..x} sdc{a..x}) # Total 96, sets of 24
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# NOTE ^^ intentionally has gaps -- sdz, sday sdaz, sdby sdbz, sdcy sdcz == Reserved for spares (7)
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# integer
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declare -i howmany sliceby idx x
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function slice () {
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howmany=$1
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sliceby=$2
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idx=0
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for x in $(seq 0 1 $howmany); do
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[ $x -ge $howmany ] && break
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let idx=$idx+1
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# echo -n "${fullset[$idx]} "
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printf "${fullset[$x]} " # no newline
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if [ $idx -ge $sliceby ]; then
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echo ' \'
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idx=0
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fi
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done
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echo ''
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}
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if [ "$1" = "" ]; then
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# Demo
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echo "o Copypasta each line not-including the '\' and verify with: echo '[paste]' |wc -w "
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slice 72 72
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echo '===== ^^ 72 / 72 -- One Big Mother vdev'
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slice 72 36
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echo '===== ^^ 72 / 36 -- 2 VDEVs'
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slice 72 24
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echo '===== ^^ 72 / 24 -- 3 VDEVs'
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# = sd{b..y} sda{a..l} \
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#sda{m..x} sdb{a..x}
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exit; # early
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fi
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# Basic sanity
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if [ "$1" -lt "$2" ]; then
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echo "$0 - Failed sanity check, \$2 must be greater than \$1"
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exit 999; # Somebody call Scotland Yard, we have a violation
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fi
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slice $1 $2
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# This is a decent method because we can give it arbitrary numbers of disks (up to total defined)
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# and divide as needed; try 26 2, 24 2, 32 4, 32 8
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# NOTE all output lines should have the same length - if you dont you wont have a balanced set of disks
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# e.g. 32 6 = invalid config (32 4 = valid) but we just give you output -- real sanity checks are up 2U
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# HOW THIS WORKS:
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# Imagine a set of disks sdb..sdcx , 96 in total, set along a slide rule
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# "idx" is our slider/window
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# If idx >= however many drives we need per vdev, it prints a "line continue" char and drops down a line -
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# giving us the exact short drive names needed to create per-vdev
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# Example for 60-bay Storinator from 45drives - gives us 56 usable disks in pool + 4 spares (sdz sday sdaz sdbi), and 4 vdevs
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# $0 56 14 |column -t
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#sdb sdc sdd sde sdf sdg sdh sdi sdj sdk sdl sdm sdn sdo \
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#sdp sdq sdr sds sdt sdu sdv sdw sdx sdy sdaa sdab sdac sdad \
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#sdae sdaf sdag sdah sdai sdaj sdak sdal sdam sdan sdao sdap sdaq sdar \
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#sdas sdat sdau sdav sdaw sdax sdba sdbb sdbc sdbd sdbe sdbf sdbg sdbh \
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# Example for 45drives with 1 spare (sdz), 4 vdevs of 11:
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# $0 44 11 |column -t
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#sdb sdc sdd sde sdf sdg sdh sdi sdj sdk sdl \
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#sdm sdn sdo sdp sdq sdr sds sdt sdu sdv sdw \
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#sdx sdy sdaa sdab sdac sdad sdae sdaf sdag sdah sdai \
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#sdaj sdak sdal sdam sdan sdao sdap sdaq sdar sdas sdat \
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#
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# If you want more spares (5): (reserved sdz sdaq sdar sdas sdat) == 1 spare for every 8 drives
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# $0 40 10 |column -t
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#sdb sdc sdd sde sdf sdg sdh sdi sdj sdk \
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#sdl sdm sdn sdo sdp sdq sdr sds sdt sdu \
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#sdv sdw sdx sdy sdaa sdab sdac sdad sdae sdaf \
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#sdag sdah sdai sdaj sdak sdal sdam sdan sdao sdap \
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# HOWTO Verify output
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# $0 42 14 |column -t >/tmp/zfsds.txt
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# sed -i 's/\\//g' /tmp/zfsds.txt # remove line-continuation chars
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# cat /tmp/zfsds.txt
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#sdb sdc sdd sde sdf sdg sdh sdi sdj sdk sdl sdm sdn sdo
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#sdp sdq sdr sds sdt sdu sdv sdw sdx sdy sdaa sdab sdac sdad
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#sdae sdaf sdag sdah sdai sdaj sdak sdal sdam sdan sdao sdap sdaq sdar
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# while read line; do echo "$line" |wc -w; done < /tmp/zfsds.txt
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# 14
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# 14
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# 14
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# HOWTO get long-form disks:
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# use drive-slicer-get-longform.sh
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# ^ Requires output from this script
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