As I understand it, RAID1 does not have a chunk size, or a strip size. So stride should not apply. No need to have that keyword in the config file. RAID0 does have a chunk size. Guy -----Original Message----- From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Ninti Systems Sent: Wednesday, May 19, 2004 10:06 PM To: 'LinuxRaid' Subject: RE: Please review: Slackware RAID How-To But is the stride parameter required at all if I'm only building a RAID1 array with two disks? Also, is the chunk size necessary in this case as I remember getting a message on boot up to the effect that "Chunk size not necessary here, but proceeding anyway!". Thanks Mick On Thu, 2004-05-20 at 11:12, John Lange wrote: > On Sun, 2004-05-16 at 23:51, Guy wrote: > > md2 has 4 disks with a chunk size of 128K. Since only 3 disks are used for > > data, and the filesystem block size is 4K, the stride size should be > > 128*3/4, or 96. > > Change: > > mke2fs -b 4096 -R stride=32 /dev/md2 > > To: > > mke2fs -b 4096 -R stride=96 /dev/md2 > > > > My logic: > > "Stripe size" is "chunk size" times "number of data disks". > > From example: > > "chunk size" = 128 > > "number of data disks" = "nr-raid-disks" - 1 (-2 if RAID6) > > I think this is incorrect. At this point I defer to the > Software-RAID-HOWTO. > > http://www.tldp.org/HOWTO/Software-RAID-HOWTO-5.html#ss5.10 > > >From that document stride is chucksize/blocksize . Number of disks does > not enter into it. > > So with a chunksize of 128, and a block size of 4 it would be: > > 128K/4K = 32 for stride. > > If this is indeed correct I will be sure to expand that area of the > How-To so it is more clear. > > Thanks very much for your feedback. > > Regards, > > John Lange > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- -------------------------------------- Ninti Systems: Smart IT Solutions Michael Hall Mobile: 0429 095 392 Ph/Fax: 08 8953 1442 Email: office at ninti dot com dot au Web: http://ninti.com.au -------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
