RAID: Difference between revisions
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Redundant Array of Inexpensive Disks | |||
=Links= | |||
*[http://en.wikipedia.org/wiki/RAID http://en.wikipedia.org/wiki/RAID] | *[http://en.wikipedia.org/wiki/RAID http://en.wikipedia.org/wiki/RAID] | ||
*[[Linux_Software_Raid|Linux Software Raid]] | *[[Linux_Software_Raid|Linux Software Raid]] | ||
*[http://www.raid-calculator.com/raid-types-reference.aspx Raid Calculator] | |||
*[https://support.huawei.com/enterprise/en/doc/EDOC1100048773/fb37ec44/raid-level-migration LSI raid level migrations] | |||
*[https://kb.open-e.com/information-on-configuring-for-optimal-raid-performance_1323.html https://kb.open-e.com/information-on-configuring-for-optimal-raid-performance_1323.html] | |||
==Raid calculators== | |||
*[http://www.raid-calculator.com/raid-types-reference.aspx Raid Calculator] | |||
*[https://magj.github.io/raid-failure/ raid failure calculator] | |||
*[https://www.raid-calculator.com/default.aspx Raid calculator] | |||
'''ACHTUNG''' don't forget block/partition alignment! | '''ACHTUNG''' don't forget block/partition alignment! | ||
= Cache settings = | |||
*[https://www.dell.com/community/PowerEdge-HDD-SCSI-RAID/difference-between-write-back-and-write-thru/td-p/633627 Difference between write back and write through] | |||
== 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% | |||
Latest revision as of 10:20, 19 August 2024
Redundant Array of Inexpensive Disks
Links
- LSI raid level migrations
- https://kb.open-e.com/information-on-configuring-for-optimal-raid-performance_1323.html
Raid calculators
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%
