Ana kwafin ƙira zuwa tsarin ajiya ta hanyar uwar garken Linux ta amfani da XCOPY

Yana faruwa cewa kana buƙatar samun cikakken kwafin ƙara a cikin tsarin adana bayanai ɗaya (DSS), ba hoto ba, clone, amma cikakken ƙara. Amma tsarin ajiya ba koyaushe yana ba da damar yin hakan a ciki ta amfani da nasa hanyoyin. Yana da alama cewa kawai zaɓi shine kwafi ta hanyar uwar garken, amma a wannan yanayin za a tura dukkan adadin bayanai ta hanyar uwar garken kanta, hanyar sadarwa zuwa tsarin ajiya da tashoshin ajiya, yana loda duk waɗannan abubuwan. Amma akwai dokokin SCSI da za su iya ba ku damar yin komai a cikin tsarin ajiya kanta, kuma idan tsarin ku yana goyan bayan VAAI daga VMware, to kusan 100% ne aka goyan bayan umarnin XCOPY (EXTENDED COPY), wanda ke gaya wa tsararrun menene kuma inda za a kwafi, ba tare da haɗa uwar garken tsari da hanyar sadarwa ba.

Da alama komai ya kamata ya zama mai sauƙi, amma ba zan iya samun wani rubutun da aka shirya ba nan da nan, don haka dole ne in sake sabunta dabaran. An zaɓi Linux don uwar garken OS, kuma an zaɓi umarnin ddpt (http://sg.danny.cz/sg/ddpt.html) azaman kayan aikin kwafi. Yin amfani da wannan haɗin, zaku iya kwafin kowane kundin daga kowane OS, tunda kwafi yana faruwa toshe-by-block a gefen tsarin ajiya. Tun da yake wajibi ne a kwafi toshe ta hanyar toshe, kuma dole ne a ƙidaya adadin tubalan, an yi amfani da umarnin blockdev don ƙidaya adadin irin waɗannan abubuwan. An sami matsakaicin girman toshe ta gwaji; ddpt a zahiri bai yi aiki tare da babban toshe ba. Sakamakon shine rubutun mai sauƙi mai sauƙi:

#!/bin/bash
# first parameter = input device
# second parameter = output device
# device size must be the same
# changing bs variable can reduce speed, max speed should be at bs=32768. 32768 is max setting, lower settings should be calculated dividing by 2

set -o nounset
bs=32768
s=`blockdev --getsz $1`
i=0
while [ $i -le $s ]
do
ddpt of=$2 bs=512 oflag=xcopy,direct if=$1 iflag=xcopy,direct count=$bs verbose=-1 skip=$i seek=$i
i=$(( $i+$bs ))
done

Bari mu yi ɗan duba! Da kyau, a matsayin ƙarami, fayil ɗin 1TB ba a ƙirƙira da sauri ba kuma aka duba ta md5sum :)

root@sales-demo-05:/home/vasilyk# blockdev --getsz /dev/mapper/mpathfs
2516582400
root@sales-demo-05:/home/vasilyk# blockdev --getsz /dev/mapper/mpathfr
2516582400
root@sales-demo-05:/home/vasilyk# mount /dev/mapper/mpathfs /xcopy_source/
mount: /xcopy_source: wrong fs type, bad option, bad superblock on /dev/mapper/mpathfs, missing codepage or helper program, or other error.
root@sales-demo-05:/home/vasilyk# mkfs /dev/mapper/mpathfs
mke2fs 1.44.1 (24-Mar-2018)
Discarding device blocks: done
Creating filesystem with 314572800 4k blocks and 78643200 inodes
Filesystem UUID: bed3ea00-c181-4b4e-b52e-d9bb498be756
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848

Allocating group tables: done
Writing inode tables: done
Writing superblocks and filesystem accounting information: done

root@sales-demo-05:/home/vasilyk# mount /dev/mapper/mpathfs /xcopy_source/
root@sales-demo-05:/home/vasilyk# ls -l /xcopy_source/
total 16
drwx------ 2 root root 16384 Aug 19 15:35 lost+found
root@sales-demo-05:/home/vasilyk# head -c 1T </dev/urandom > /xcopy_source/1TB_file
root@sales-demo-05:/home/vasilyk# ls -l /xcopy_source/
total 1074791444
-rw-r--r-- 1 root root 1099511627776 Aug 19 17:25 1TB_file
drwx------ 2 root root         16384 Aug 19 15:35 lost+found
root@sales-demo-05:/home/vasilyk# umount /xcopy_source
root@sales-demo-05:/home/vasilyk# mount /dev/mapper/mpathfr /xcopy_dest/
mount: /xcopy_dest: wrong fs type, bad option, bad superblock on /dev/mapper/mpathfr, missing codepage or helper program, or other error.
root@sales-demo-05:/home/vasilyk# cat xcopy.sh
#!/bin/bash
# first parameter = input device
# second parameter = output device
# device size must be the same
# changing bs variable can reduce speed, max speed should be at bs=32768. 32768 is max setting, lower settings should be calculated dividing by 2

bs=32768
s=`blockdev --getsz $1`
i=0
while [ $i -le $s ]
do
ddpt of=$2 bs=512 oflag=xcopy,direct if=$1 iflag=xcopy,direct count=$bs verbose=-1 skip=$i seek=$i
i=$(( $i+$bs ))
done
root@sales-demo-05:/home/vasilyk# time ./xcopy.sh /dev/mapper/mpathfs /dev/mapper/mpathfr
real    11m30.878s
user    2m3.000s
sys     1m11.657s

Abin da ke faruwa akan tsarin ajiya a wancan lokacin:

Bari mu ci gaba da Linux.

root@sales-demo-05:/home/vasilyk# mount /dev/mapper/mpathfr /xcopy_dest/
root@sales-demo-05:/home/vasilyk# ls -l /xcopy_dest/
total 1074791444
-rw-r--r-- 1 root root 1099511627776 Aug 19 17:25 1TB_file
drwx------ 2 root root         16384 Aug 19 15:35 lost+found
root@sales-demo-05:/home/vasilyk# mount /dev/mapper/mpathfs /xcopy_source/
root@sales-demo-05:/home/vasilyk# md5sum /xcopy_source/1TB_file
53dc6dfdfc89f099c0d5177c652b5764  /xcopy_source/1TB_file
root@sales-demo-05:/home/vasilyk# md5sum /xcopy_dest/1TB_file
53dc6dfdfc89f099c0d5177c652b5764  /xcopy_dest/1TB_file
root@sales-demo-05:/home/vasilyk#

Komai yayi aiki, amma gwada da amfani da haɗarin ku! A matsayin ƙarar tushe, yana da kyau a ɗauki hotuna, don farawa.

source: www.habr.com