[linux-lvm] Max storage size per system
Greg Freemyer
freemyer at NorcrossGroup.com
Fri Mar 7 13:59:01 UTC 2003
>> 2 rotating parity disks ? Can you elaborate on how that works ?
>> I have thought about using something else than raid5, where you would
>> split the data across a number of disks, AND use a mirrored device for
>> storing the parity on.
I don't think it is the same as the above, but on Compaq ProLiants, they have Advanced Data Guard.
http://h18004.www1.hp.com/products/servers/proliantstorage/arraycontrollers/adg/
With it you define the number of data drives(D) you want, and the number of parity drives(P).
Obviously you need D + P drives, but no data is lost until you loose P+1 drives.
The negative is even worse performance than RAID 5, but it does make for greater reliability.
BTW: HP's (Compaq's) "low-end" FC array (MSA 1000) also support Advanced Data Guard. IIRC their mid-tier and high-end lines don't.
Greg
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