Niron jilid kana sistem panyimpen via server Linux nganggo XCOPY

Éta kajadian yén anjeun kedah kéngingkeun salinan pinuh ku volume dina hiji sistem panyimpen data (DSS), sanés snapshot, clone, tapi volume pinuh. Tapi sistem panyimpen henteu salawasna ngamungkinkeun ieu dilakukeun sacara internal nganggo cara sorangan. Sigana hiji-hijina pilihan nyaéta nyalin ngaliwatan server, tapi dina hal ieu sakabéh volume data bakal disetir ngaliwatan server sorangan, jaringan ka sistem gudang jeung palabuhan gudang, loading sakabéh komponén ieu. Tapi aya paréntah SCSI nu bisa ngidinan Anjeun pikeun ngalakukeun sagalana dina sistem gudang sorangan, sarta lamun sistem Anjeun ngarojong VAAI ti VMware, mangka ampir 100% nu XCOPY (EXTENDED COPY) paréntah dirojong, nu ngabejaan Asép Sunandar Sunarya naon jeung dimana nyalin, tanpa ngalibetkeun prosés server jeung jaringan.

Sigana mah sagalana kudu basajan, tapi kuring teu bisa manggihan sagala Aksara siap-dijieun langsung, jadi kuring kungsi reinvent kabayang. Linux dipilih pikeun OS pangladén, sareng paréntah ddpt (http://sg.danny.cz/sg/ddpt.html) dipilih salaku alat panyalin. Nganggo kombinasi ieu, anjeun tiasa nyalin jilid naon waé tina OS mana waé, sabab nyalin lumangsung blok-demi-blok dina sisi sistem panyimpen. Kusabab anjeun kedah nyalin blok ku blok, sareng jumlah blok kedah diitung, paréntah blockdev dianggo pikeun ngitung jumlah iterations sapertos kitu. Ukuran blok maksimum dicandak sacara ékspériméntal; ddpt henteu leres-leres damel sareng blok ageung. Hasilna nyaéta skrip anu saderhana di handap ieu:

#!/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

Hayu urang ngalakukeun cek saeutik! Nya, sakumaha anu alit, file 1TB henteu gancang didamel sareng dipariksa ku 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

Naon anu lumangsung dina sistem panyimpenan dina waktos éta:

Hayu urang teraskeun sareng 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#

Sagalana digawé kaluar, tapi nguji sarta ngagunakeun dina resiko sorangan! Salaku volume sumber, éta hadé nyandak snapshots, pikeun starters.

sumber: www.habr.com