Ukukopisha amavolumu ezinhlelweni zokugcina ngeseva ye-Linux kusetshenziswa i-XCOPY

Kwenzeka ukuthi udinga ukuthola ikhophi egcwele yevolumu ngaphakathi kwesistimu eyodwa yokugcina idatha (i-DSS), hhayi isifinyezo, i-clone, kodwa ivolumu egcwele. Kodwa uhlelo lokugcina aluvumeli njalo ukuthi lokhu kwenziwe ngaphakathi kusetshenziswa izindlela zalo. Kubonakala sengathi okuwukuphela kwenketho ukukopisha ngeseva, kodwa kulokhu ivolumu yonke yedatha izoqhutshwa ngeseva ngokwayo, inethiwekhi ohlelweni lwesitoreji kanye namachweba okugcina, ukulayisha zonke lezi zingxenye. Kepha kukhona imiyalo ye-SCSI engakuvumela ukuthi wenze yonke into ngaphakathi kwesistimu yokugcina uqobo, futhi uma uhlelo lwakho lusekela i-VAAI evela ku-VMware, cishe cishe i-100% ukuthi umyalo we-XCOPY (EXTENDED COPY) usekelwa, otshela uhlu ukuthi yini futhi lapho ungakopisha khona, ngaphandle kokufaka iseva yenqubo nenethiwekhi.

Kubonakala sengathi yonke into kufanele ibe lula, kodwa angikwazanga ukuthola noma yiziphi izikripthi ezenziwe ngomumo ngaso leso sikhathi, ngakho kwadingeka ngilisungule kabusha isondo. I-Linux ikhethelwe i-OS yeseva, futhi umyalo we-ddpt (http://sg.danny.cz/sg/ddpt.html) wakhethwa njengethuluzi lokukopisha. Usebenzisa le nhlanganisela, ungakopisha noma yimiphi imiqulu kunoma iyiphi i-OS, njengoba ukukopisha kwenzeka i-block-by-block ohlangothini lwesistimu yokugcina. Njengoba kudingekile ukukopisha ibhulokhi ngebhulokhi, futhi inombolo yamabhulokhi kufanele ibalwe, umyalo we-blockdev wasetshenziselwa ukubala inani lokuphindaphinda okunjalo. Umkhawulo kasayizi webhulokhi utholwe ngokuhlola; i-ddpt ayizange isebenze nebhulokhi enkulu. Umphumela waba umbhalo olandelayo olula:

#!/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

Ake senze isheke elincane! Nokho, njengelincane, ifayela le-1TB alizange lidalwe ngokushesha futhi lihlolwe yi-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

Okwakwenzekani ohlelweni lwesitoreji ngaleso sikhathi:

Asiqhubeke nge-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#

Konke kuphumelele, kodwa zivivinye futhi usebenzise ngokuzifaka wena engozini! Njengomthamo womthombo, kungcono ukuthatha izifinyezo, okokuqala.

Source: www.habr.com