Hi all, sorry if I seem a bit overcautious, but I feel I'm lost in the cylinder-sector-block conversion-thingy... :)
I bought two Vertex 2 SSD's (I compile a big software regularly, and thought I'd speed up the process a bit). First question: if I understand correctly, zfs (not ZIL!) is not the best option for SSD's, because of copy-on-write. Am I right here? Another thing is TRIM, that (according to bug 6866610) is available since nv_146, so OpenIndiana (147) should have it. Question 2: How do TRIM and ZFS's copy-on-write play together? So I thought I'd be better off with UFS, and installed OI on another hdd (since Osol/OI install on zfs). I installed Win7 too on one ssd, and put Win's swap on the other one. Win7 properly aligned the partitions, that's fine. I created the other fdisk partitions with gparted, and verified that they are aligned too, on both SSD's. I know that if I give the whole disk to ZFS than alignment is not a problem. But it's not the case here. My concern is the slice-layout. Could somebody please take a look at it and say it's okay, or not. (Please find the data at the end of the message) I ask, because I found the following description on wikis.sun.com: http://wikis.sun.com/display/Performance/How+to+4k+Align+Flash+on+Solaris+x86 and http://wikis.sun.com/pages/viewpage.action?pageId=186241353 ...and vdbench gives me around 16k IOPS and ~57MB random 4k writes, while the drives themselves should be capable of more than that. (no, I'm _not_ benchmark-tied :), but gave that a try, and the results are suspicious...) The HW is a Q6600 CPU, an Intel 975x chipset (Asus P5W64 WS Pro 975X Express), ICH7, 8GB DDR2. I am not sure if it's a hardware limitation (ICH7 maybe?), or the not-correctly aligned slice layout is the cause? I began slice 0 on cylinder 7, because 16065*8 is the smallest number that is divisible by 8, and the first cylinder is 0. This is the place where I'm not sure... Thank you very much for taking the the and reading this! - Any hints, tips, trick would be appreciated :) ==================== Now comes the technical part, with some data. ________________________________ SSD1 ________________________________ The fdisk table looks like this: Total disk size is 7297 cylinders Cylinder size is 16065 (512 byte) blocks Cylinders Partition Status Type Start End Length % ========= ====== ============ ===== === ====== === 1 Active IFS: NTFS 0 12 13 0 2 IFS: NTFS 12 3262 3251 45 3 Solaris2 3263 6526 3264 45 gparted says (in sectors; start sec - end sec): fdisk partition 1: 2048 - 206 847 fdisk partition 2: 206 848 - 52 430 847 fdisk partition 3: 52 430 848 - 104 859 647 and the slice layout is as follows: partition> pri Current partition table (original): Total disk cylinders available: 3261 + 2 (reserved cylinders) Part Tag Flag Cylinders Size Blocks 0 unassigned wm 8 - 3260 24.92GB (3253/0/0) 52259445 1 unassigned wm 0 0 (0/0/0) 0 2 backup wu 0 - 3260 24.98GB (3261/0/0) 52387965 3 unassigned wm 0 0 (0/0/0) 0 4 unassigned wm 0 0 (0/0/0) 0 5 unassigned wm 0 0 (0/0/0) 0 6 unassigned wm 0 0 (0/0/0) 0 7 unassigned wm 0 0 (0/0/0) 0 8 boot wu 0 - 0 7.84MB (1/0/0) 16065 9 alternates wm 1 - 2 15.69MB (2/0/0) 32130 ________________________________ SSD2 ________________________________ Total disk size is 7297 cylinders Cylinder size is 16065 (512 byte) blocks Cylinders Partition Status Type Start End Length % ========= ====== ============ ===== === ====== === 1 Active IFS: NTFS 0 1174 1175 16 2 Solaris2 1175 6527 5353 73 gparted says (in sectors; start sec - end sec): fdisk partition 1: 2048 - 18 876 415 fdisk partition 2: 18 876 416 - 104 859 647 and the slice layout is as follows: partition> pri Current partition table (original): Total disk cylinders available: 5350 + 2 (reserved cylinders) Part Tag Flag Cylinders Size Blocks 0 unassigned wm 7 - 1182 9.01GB (1176/0/0) 18892440 1 unassigned wm 1183 - 5348 31.91GB (4166/0/0) 66926790 2 backup wu 0 - 5349 40.98GB (5350/0/0) 85947750 3 unassigned wm 0 0 (0/0/0) 0 4 unassigned wm 0 0 (0/0/0) 0 5 unassigned wm 0 0 (0/0/0) 0 6 unassigned wm 0 0 (0/0/0) 0 7 unassigned wm 0 0 (0/0/0) 0 8 boot wu 0 - 0 7.84MB (1/0/0) 16065 9 alternates wm 1 - 2 15.69MB (2/0/0) 32130 ps: I'm manually CC'ing from storage, because though I clicked the CC line, it didn't do that... -- This message posted from opensolaris.org _______________________________________________ opensolaris-help mailing list opensolaris-help@opensolaris.org
