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disk fails, the sum of all remaining bits reveals whether the missing disk would need to have a 0 or a 1 to meet the even or odd status stored on the parity disk.
The advantage of RAID 3 is that you
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.
Enterprise-Level Features
Btrfs is a copy-on-write (COW) filesystem. Whereas a filesystem like ext3 logs block changes in a journal, Btrfs always writes changes to a block at a new location on the disk
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kernel
sles:~ # grep crash /proc/cmdline
root=/dev/disk/by-uuid/10a83ffe-5a9f-48a2-b8cb-551c2cc6b42d resume=/dev/sda3 splash=silent text showopts crashkernel=128
sles:~ # /etc/init.d/boot.kdump status
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).
Listing 1
Crush Map for Six Servers in Two Racks
001 # begin crush map
002
003 # devices
004 device 0 device0
005 device 1 device1
006 device 2 device2
007 device 3 device3
008 device 4 device4
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42 spawn $env(SHELL)
43 match_max 100000
44 expect -exact "]0;khess@trapper: ~khess@trapper:~\$ "
45 send -- "ssh aspen\r"
46 expect -exact "ssh aspen\r
47 khess@aspen's password: "
48 send
