2011/3/24 Roberto Spadim <roberto@xxxxxxxxxxxxx>: > i think you will have no problems with location of metadata, there's > some versions of metadata, at start at end.. check your mdadm --create > command yes, I found that option. If I choose to put metadata on the start area of a disk, disk's head seek time will be decreased, right? So, is there someone in this list to tell me what is real difference when putting meta data on start or end of a disk? > what information at metadata is/was wrong? can you get it? or just i/o error? > some months ago i had two broken harddisks, the disk start to read > from position 0 to position X without problem, but when it get at a > position where disk was crashed (real crashed, the disk hit the floor) > the array start to resync (maybe a disk report) it was a raid10 array. > maybe you have problem at physical layer (disk with problem). > i don't know what informations md update at metadata, but i think that > there's some last write counter/last write timestamp to sync what > mirrors is more recent in a broken array start, (this information can > be found with others developers in this list) > > 2011/3/23 hank peng <pengxihan@xxxxxxxxx>: >> Hi, guys: >> I found that when disk errors happened, it is more likely to locate in >> md super block area. Kernel messages are like this: >> end_request: I/O error, dev sda, sector 1953525000 >> md: super_written gets error=-5, uptodate=0 >> In some cases, I check if disk is really failed using 'dd' command and >> found that it is OK for read and write on those sectors. >> >> I know that md super block information is located in the end of a >> disk, but is it related with this problem? Is it safer to put md super >> block in the start area of a disk? >> >> >> -- >> The simplest is not all best but the best is surely the simplest! >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at Âhttp://vger.kernel.org/majordomo-info.html >> > > > > -- > Roberto Spadim > Spadim Technology / SPAEmpresarial > -- The simplest is not all best but the best is surely the simplest! -- 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
