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1. check & set I/O scheduler in linux check & set I/O scheduler in linux

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   # check & set I/O scheduler in linux

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   ### check command

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   `$ cat /sys/block/*/queue/scheduler`

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   ### sample output

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   ```

2. mount lvm volume mount lvm volume

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   Run `sudo pvs` to get a volume group (column VG) for your device.  

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   Run `sudo lvdisplay ⟨your VG⟩` to get a LV Path.  

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   Run `sudo vgchange -a y` to activate all groups.  

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   Now you can mount it: `sudo mount ⟨your LV Path⟩ /mnt/somepoint`