Am 19.02.2013 20:59, schrieb Gordan Bobic: > On 19/02/2013 19:42, Reindl Harald wrote: >> >> >> Am 19.02.2013 20:24, schrieb Gordan Bobic: >>> On 19/02/2013 19:05, Reindl Harald wrote: >>>> >>>> >>>> Am 19.02.2013 20:02, schrieb Gordan Bobic: >>>>>> what exactly do you need to align on the partitions? >>>>> >>>>> For a start, making sure your RAID implementation puts the metadata >>>>> at the end of the disk, rather than the beginning. >>>> >>>> "my RAID implementation"? >>>> LINUX SOFTWARE RAID >>>> >>>> and this is how the raid-partitions are looking >>>> no problem since years >>>> >>>> Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors >>>> Units = sectors of 1 * 512 = 512 bytes >>>> Sector size (logical/physical): 512 bytes / 512 bytes >>>> I/O size (minimum/optimal): 512 bytes / 512 bytes >>>> Disk identifier: 0x0000ae2c >>>> Device Boot Start End Blocks Id System >>>> /dev/sda1 * 2048 1026047 512000 fd Linux raid autodetect >>>> /dev/sda2 1026048 31746047 15360000 fd Linux raid autodetect >>>> /dev/sda3 31746048 3906971647 1937612800 fd Linux raid autodetect >>>> >>>> [root@srv-rhsoft:/downloads]$ sfdisk -d /dev/sda >>>> # partition table of /dev/sda >>>> unit: sectors >>>> /dev/sda1 : start= 2048, size= 1024000, Id=fd, bootable >>>> /dev/sda2 : start= 1026048, size= 30720000, Id=fd >>>> /dev/sda3 : start= 31746048, size=3875225600, Id=fd >>>> /dev/sda4 : start= 0, size= 0, Id= 0 >>> >>> That's the MD partition alignment, not the alignment of the FS space within the MD device. The two are not the >>> same. >> >> maybe you should read older posts in the thread > > Looking for what, exactly? > >> [root@srv-rhsoft:/downloads]$ tune2fs -l /dev/md1 > [...] > This won't tell you the FS alignment against the raw underlying disk sectors. > >> Blocks per group: 32768 > > This is sub-optimal in almost all cases except RAID1 or single-disk, as I explained earlier how do you meassure "sub-optimal"? the time wasted to re-install a complex setup and start configuration from scratch, especially if you have more than one clones of the same machine will never be worth 1,2.3% of theoretical performance so i do not give a damn about a few percent and as long SSD's are way to expensive to store some TB in RAID setups they are no option and if they are at a valid price they are free from early-adopters problems as said: NOW i would not save any important data on a SSD and i do not own any unimportant data beause if it is unimportant i go ahead and delete it at all maybe you install from scratch regulary i do never and i am on board since Fedora Core 3
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