On Tuesday September 27, lfarkas@xxxxxxxxx wrote: > Neil Brown wrote: > > On Tuesday September 27, lfarkas@xxxxxxxxx wrote: > > > >>hi, > >>i'd been already asked, but don't get any answer. what is the maximum > >>size of a raid5 and raid5 partition in kerenel 2.6? i try to find the > >>answer but found only kernel 2.4 info. > >>thanks in advance. > >> > > > > > > Providing you are using either 64bit hardware, or the 'LBD' (large > > block device) config, then raid5 arrays can be up to 2^64 - > > i.e. enormous - no practical limit. > > huu, i don't know. we use 3ware 7506 controller. on it onw homepage it > said: > --------------------------- > Supports up to 12 drives with a single PCI card enabling up to 3.6 > terabytes of storage (dependent on drive capacity, 2TB per array maximum) > --------------------------- > but it's all about the hardware raid5. so it's native hardware raid5 > can't be larger than 2TB. Quite possibly. I was talking about 'md' software raid. It don't not have a 2TB limit in 2.6 > > I don't know what you mean by 'raid5 partition'. If you mean like a > > regular partition of a device, then the partition can be nearly as bit > > as the array.... > > suppose i create the raid device with: > mdadm --create /dev/md0--level=5 --raid-devices=8 --spare-devices=1 > /dev/sd[abcdefgh]1 > then what is the maximum size for /dev/md0? > (or more precisely after a mkfs.ext3 /dev/md0). The /dev/sdX1 cannot be larger than 2TB. The /dev/md0 can be as big as you like. The filesystem can be as big as your filesystem allows. I don't think ext3 can exceed 2 TB (I could be wrong). Other filesystems (reiser, xfs) can certainly use whatever you can through at them. NeilBrown - 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
