Nyalin volume menyang sistem panyimpenan liwat server Linux nggunakake XCOPY

Mengkono sing kudu njaluk salinan lengkap volume ing siji sistem panyimpenan data (DSS), ora snapshot, Klone, nanging volume lengkap. Nanging sistem panyimpenan ora tansah ngidini iki rampung internal nggunakake sarana dhewe. Iku misale jek sing mung pilihan kanggo nyalin liwat server, nanging ing kasus iki kabeh volume data bakal mimpin liwat server dhewe, jaringan kanggo sistem panyimpenan lan bandar panyimpenan, loading kabeh komponen iki. Nanging ana prentah SCSI sing bisa ngidini sampeyan nindakake kabeh ing sistem panyimpenan dhewe, lan yen sistem sampeyan ndhukung VAAI saka VMware, meh 100% printah XCOPY (EXTENDED COPY) didhukung, sing ngandhani array apa lan ngendi kanggo nyalin, tanpa nglibatno server proses lan jaringan.

Iku misale jek kaya kabeh kudu prasaja, nanging aku ora bisa nemokake sembarang Tulis siap-digawe langsung, aku kudu reinvent setir. Linux dipilih kanggo OS server, lan printah ddpt (http://sg.danny.cz/sg/ddpt.html) dipilih minangka alat nyalin. Nggunakake kombinasi iki, sampeyan bisa nyalin volume apa wae saka OS apa wae, amarga nyalin ana blok-by-blok ing sisih sistem panyimpenan. Amarga perlu kanggo nyalin blok kanthi blok, lan jumlah blok kudu diitung, perintah blockdev digunakake kanggo ngitung jumlah iterasi kasebut. Ukuran blok maksimal dipikolehi kanthi eksperimen; ddpt ora bisa digunakake kanthi blok gedhe. Asil kasebut minangka skrip sing cukup prasaja:

#!/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

Ayo priksa sethithik! Inggih, minangka cilik, file 1TB ora cepet digawe lan dicenthang dening 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

Apa sing kedadeyan ing sistem panyimpenan nalika iku:

Ayo terus nganggo 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#

Kabeh wis rampung, nanging nyoba lan nggunakake kanthi resiko dhewe! Minangka volume sumber, luwih apik kanggo njupuk jepretan, kanggo wiwitan.

Source: www.habr.com