Hello guys, first of all sorry for asking about OSS and OST RAID configurations I say few posts on the subject , but they don`t quite answer my questions. So my pickle is : I have a couple of storage enclosures (16 bay storage controller + 16 bay JBOD attached.). Each 16 bay storage controller has dual raid controller, so in order to use the maximum hardware performance and maximum storage capacity, I think to create 4 Luns (8 disks each in RAID 5). The first 2 Luns will be assigned to controller "A" and the second 2 Luns to controller "B", total 4 OSS per OST. This way I will break the "Golden rule" about Lusre 1MB RPC. I`ve created the RAID with 128 KB chunk size(stripe size in my controllers "language"). So my mkfs.lustre options are : -E stride=128, stripe_width=(128 * 7 = 896) In the manual it says, that if one cannot fit evenly into 1 MB, it should choose such stripe_width that is close, but not larger that 1 MB, as I am. If I choose bigger stripe size for the RAID controller (256 KB) I`ll go way beyond 1MB. So in your expert opinions will my configuration suffer a lot from this, and are my calculations correct. I can use different scheme for the luns for example RAID5(4+1), RAID6(4+2) but in both cases I loose disks and storage capacity and number of OSS per OST goes from 4 to 6. Cheers, _______________________________________________ Lustre-discuss mailing list Lustre-discuss-aLEFhgZF4x6X6Mz3xDxJMA@public.gmane.org http://lists.lustre.org/mailman/listinfo/lustre-discuss