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you can try lsblk command which shows the Logical Volume used by respective dev-mapper. # lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 8G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 7.5G 0 part ├─vg_root-lv_root (dm-0) 253:0 0 ...


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Maybe device-mapper is 'stealing' this device. Try this: [root@host ~]# dmsetup ls sdb (253, 2) VolGroup00-LogVol01 (253, 1) VolGroup00-LogVol00 (253, 0) If you find sdb device listed as above example, remove it using dmsetup and create the physical volume: [root@host ~]# dmsetup remove sdb [root@host ~]# pvcreate /dev/sdb Physical volume ...


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Since the two disks are exactly the same size and need to contain exactly the same data, you could use dd: dd if=/dev/sdb of=/dev/sda bs=16M You'll need to boot from a live use though. Please check the if(in file) and of(out file) statements from the live usb. Once you start dd(disk destroyer), there's no going back.


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I'd check the following in order Verify HBA adapters on second servers are connected to Brocade switch(s). Verify WWPN's from 2nd server are logged into Brocade switch ports. Verify HBA WWPN's on second server are zoned correctly in Brocade switch(s). Verify WWPN's from 2nd server are visible from DS8000. Verify LUN's on DS8000 are assigned to the correct ...


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disclaimer: you should read lvm manual carefully and understand what each step does. however, there should be very little risk unless you encounter errors. this is what I do usually i this case. if there is a chance that someone else might do something to mess you up, you want to block any login while doing the maintenance (touch /etc/nologin etc. per your ...


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When you extend your virtual disk, you need to do couple of changes to be visible. First, if you have done an online resize, you need to rescan the device: for i in /sys/class/scsi_device/*; do echo 1 > $i/device/rescan ; done Now, you will see your block device with new size. After that, if you have partitioned your drive, you have to extend ...



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