Folks, I realize this thread has run its course, but I've got a variant of the original question: What performance problems or anomalies might one see if mixing both whole disks _and_ slices within the same pool?
I have in mind some Sun boxes (V440, T2000, X4200) with four internal drives. Typically, one would setup root/swap/var as an SVM/UFS mirror on one pair of drives, and the second pair as a mirrored ZFS pair. However, on the typical 72GB drives, much of that first pair (maybe half or more) would not be needed for system+swap. Suppose we use 24GB of the first pair as our SVM/UFS system mirror, with the free space left in slice 5 of each drive. We could then make maximum use of the remaining space as a zfs pool via something like: zpool create mirror c0t2d0 c0t3d0 mirror c0t0d0s5 c0t1d0s5 Is this allowed? Is it stupid? Will performance be so bad/bizarre that it should be avoided at all costs? Anybody tried it? BTW, in my experience the OS/swap/var filesystems get very little I/O unless RAM is in short supply. So on a well-sized system, there should be little contention between the "system" portion and "data" portion of those shared disks (regardless of whether or not ZFS is in use). Thanks and regards, Marion _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
