RAID: Difference between revisions
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=FAQ= | =FAQ= | ||
==Raid levels== | |||
===RAID 0=== | |||
stripe | |||
===RAID 1=== | |||
mirror | |||
==BBU== | ==BBU== | ||
===Relative State of Charge=== | ===Relative State of Charge=== | ||
Should be well above 90% | Should be well above 90% | ||
Revision as of 15:15, 8 August 2024
Redundant Array of Inexpensive Disks
- http://en.wikipedia.org/wiki/RAID
- Linux Software Raid
- Raid Calculator
- https://kb.open-e.com/information-on-configuring-for-optimal-raid-performance_1323.html
ACHTUNG don't forget block/partition alignment!
Cache settings
write through
write back
always write back
HOWTO
Remove raid metadata from disk
DISK=/dev/sdc # the last bit dd if=/dev/zero of=$DISK bs=512 seek=$(( $(blockdev --getsz $DISK) - 1024 )) count=1024 # the first bit dd if=/dev/zero of=$DISK bs=512 count=1
FAQ
Raid levels
RAID 0
stripe
RAID 1
mirror
BBU
Relative State of Charge
Should be well above 90%
