Date: Mon, 18 Apr 2016 23:23:54 -0400 From: Michael Powell <nightrecon@hotmail.com> To: freebsd-questions@freebsd.org Subject: Re: Raid 1+0 Message-ID: <nf48a7$et6$1@ger.gmane.org> References: <571533F4.8040406@bananmonarki.se>
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Bernt Hansson wrote: > Hello list > > My motherboard has a raid chip on it (AMD SB750), so my plan was to use > it. Since i never used the chip for raid, i thought i might try. > > So far this has been done. > > Set up 2 arrays with 2 discs in each array with raid1 on both. > > Boot up freebsd 10.3-R. Both arrays are found > > GEOM_RAID: Promise: Disk ada0 state changed from NONE to ACTIVE. > GEOM_RAID: Promise: Subdisk RAID 1 LD 1:0-ada0 state changed from > NONE to ACTIVE. > GEOM_RAID: Promise: Disk ada1 state changed from NONE to ACTIVE. > GEOM_RAID: Promise: Subdisk RAID 1 LD 1:1-ada1 state changed from > NONE to ACTIVE. > GEOM_RAID: Promise: Volume started. > GEOM_RAID: Promise: Volume RAID 1 LD 1 state changed from STARTING to > OPTIMAL. > GEOM_RAID: Promise: Provider raid/r0 for volume RAID 1 LD 1 created. > GEOM_RAID: Promise: Disk ada2 state changed from NONE to ACTIVE. > GEOM_RAID: Promise: Subdisk RAID 1 LD 2:0-ada2 state changed from > NONE to ACTIVE. > GEOM_RAID: Promise: Disk ada3 state changed from NONE to ACTIVE. > GEOM_RAID: Promise: Subdisk RAID 1 LD 2:1-ada3 state changed from > NONE to ACTIVE. > GEOM_RAID: Promise: Volume started. > GEOM_RAID: Promise: Volume RAID 1 LD 2 state changed from STARTING to > OPTIMAL. > GEOM_RAID: Promise: Provider raid/r1 for volume RAID 1 LD 2 created. > > Used gstripe to stripe the arrays raid/r0 + r1 into stripe0 > > Newfs/mount all work. My question, is this a raid 1+0 or 0+1? This is RAID 1+0. Characteristics of such gives better I/O performance for lots of small random reads/writes such as the way a database server uses disk. The flip side of this (RAID 0+1) will have better performance for sequential throughput for use such as file server for storing backups and other large files. -Mike
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