er krishna wrote: > in the case of SAS, you can basically have 128 fanout expanders and > 128 edge expanders per host connector. That gets you 16384 disks per > physical SAS connector. > > >>>> This is clear and thanks for it. But Can SATA hard disks be > connected on SAS controller ? I don't hink our AoE will serve with SAS > disks. Please confirm it.
AoE can serve out any storage you want. You can serve files, logical volumes, raw block devices, you name it. AoE can export any type of storage, be it IDE, SATA, SAS, SCSI, Fibre Channel -- AoE doesn't care. SATA hard disks can, in fact, be connected to a SAS controller (but not vice versa). They do this using STP, the SATA Tunneling Protocol. You should read http://en.wikipedia.org/wiki/Serial_Attached_SCSI for more information. > In the case of SATA, you can get a 15-device breakout expander. This > expander cannot be cascaded like SAS, so you're limited to 15 > devices per connector (total). > > >>> Just asking, here I am not clear. How many connectors I can connect > ? Each connector will have 15 disks capacity. Is there any way to > connect more than one connectors, what will be the maximum limit > according to the available solution in market. I am not concerned about > theoretical limits. You have 15 devices per controller channel when using a SATA expander. Thus, if you have a 16-channel SATA controller, you can connect 16 expanders with 15 drive connectors each, for a total of 240 disks. If your SATA controller has 24 channels, 360 disks. You just need one expander per channel. Note that expanders are not common, and, as I said, work poorly with Linux. So, if you do manage to get your hands on one, make sure you're using a hardware RAID adapter. Regards, -- Kelsey Hudson Sr. Systems Administrator, DrJays.com 9180 Camino Santa Fe, San Diego, CA 92121 888.437.5297x134 (desk) 619.852.6374 (cell) ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Aoetools-discuss mailing list Aoetools-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
