Currently OMV is on 256 Gb SSD. I reduced the partition size to 27 Gb and want to dd it to 32 gb USB Flash.
Code
dd if=/dev/sda of=/dev/sdg bs=1MDidn't work because not enough space. What is the right command please?
dd ssd to usb
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dd is copying the complete device, not only a partition. However, the result should be ok. Did you try?
If not it might be a Gb vs. GB issue.
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The mistake you are making is that /dev/sda and /dev/sdg refer to entire disks, not any particular partition. The result is a copy of 256Gb onto a device that is only 32Gb..........not enough room.
Then, if you "correct" your procedure to use partitions, ie /dev/sda1 copied to /dev/sdg1 enough room will exist. However, this does not copy the MBR so the disk copy will not boot.
Often times what you tried will in fact actually work even though it threw an insufficient space error. In a case like this, it failed when copying empty space that doesn't matter. Try booting the failed copy if you haven't.
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OK. I tried to mount the usb in OMV but it doesn't appear.There is not even a file system anymore
What may have happened is that when the copy operation failed due to insufficient space, disks were not sync'd and the data didn't actually get copied to the destination disk, it was left in memory instead. Always run a sync command after a dd, even if it succeeded.
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Use clonezilla. Or create the partition table on the destination usb and just dd the partitions. The latter is harder to get right.
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I tried dd again.
then
Codesync /dev/sdgBut same result. No file system
It's just:
sync
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Why do you not want to use clonezilla? This is what it is made for.
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I reduced the partition size to 27 Gb
Did you make sure that all partitions are moved to the left in gparted?
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Why do you not want to use clonezilla? This is what it is made for.
I am at beginner level and I like to learn some commands. It seemed simpler to use putty and ssh. no reboot needed. But I can try clonezilla
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Did you make sure that all partitions are moved to the left in gparted
You mean to the left of the unallocated space on the ssd. No I didn't make sure. But I take a look before I try clonezilla
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I am at beginner level and I like to learn some commands
Using dd to clone a larger disk to a smaller disk is not something for beginner level.
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Doing things with command is so much faster and more fun.
While I can do this and have done this many times, clonezilla is faster and easier. clonezilla won't use dd either. It will use partclone. dd is slow since it copies every bit even if empty.
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clonezilla terminated without cloning because disk size 32 Gb flash drive too small for 256GB SSD
Have you tested if it starts? Even if the final part of the disk was not copied, it could still boot. The part that has not been copied is assumed to be empty.
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