Hi.
FreeBSD 11.0-RC1 r303979, zfs raidz1:
===Cut==
# zpool status gamestop
pool: gamestop
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
gamestop ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
da0 ONLINE 0 0 0
da1 ONLINE 0 0 0
da2 ONLINE 0 0 0
da3 ONLINE 0 0 0
da4 ONLINE 0 0 0
da5 ONLINE 0 0 0
===Cut==
6 disks 960 Gbs each:
===Cut==
# smartctl -a /dev/da0
smartctl 6.5 2016-05-07 r4318 [FreeBSD 11.0-RC1 amd64] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ==Model Family: Samsung based SSDs
Device Model: SAMSUNG MZ7KM960HAHP-00005
Serial Number: S2HTNX0H507466
LU WWN Device Id: 5 002538 c402bdac1
Firmware Version: GXM1003Q
User Capacity: 960 197 124 096 bytes [960 GB]
Sector Size: 512 bytes logical/physical
[...]
===Cut==
But:
===Cut==
# zpool list gamestop
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
gamestop 5,22T 4,38T 861G - 24% 83% 1.00x ONLINE -
===Cut==
Why 5.22T ? If zpool is displaying raw size, it should be 960 x 6 = 5760
Gb = 5.65 T. If it's displaying the actual data, then it should be 960 x
5 = 4800 Gb = 4.68 T. 5.22 T is neither of these. I'm stuck, please
explain. :)
Thanks.
Eugene.
On Sun, Oct 16, 2016 at 10:56 AM, Eugene M. Zheganin <emz at norma.perm.ru> wrote:> Hi. > > FreeBSD 11.0-RC1 r303979, zfs raidz1: > > ===Cut==> > # zpool status gamestop > pool: gamestop > state: ONLINE > scan: none requested > config: > > NAME STATE READ WRITE CKSUM > gamestop ONLINE 0 0 0 > raidz1-0 ONLINE 0 0 0 > da0 ONLINE 0 0 0 > da1 ONLINE 0 0 0 > da2 ONLINE 0 0 0 > da3 ONLINE 0 0 0 > da4 ONLINE 0 0 0 > da5 ONLINE 0 0 0 > > ===Cut==> > 6 disks 960 Gbs each: > > ===Cut==> > # smartctl -a /dev/da0 > smartctl 6.5 2016-05-07 r4318 [FreeBSD 11.0-RC1 amd64] (local build) > Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org > > === START OF INFORMATION SECTION ==> Model Family: Samsung based SSDs > Device Model: SAMSUNG MZ7KM960HAHP-00005 > Serial Number: S2HTNX0H507466 > LU WWN Device Id: 5 002538 c402bdac1 > Firmware Version: GXM1003Q > User Capacity: 960 197 124 096 bytes [960 GB] > Sector Size: 512 bytes logical/physical > > [...] > > ===Cut==> > But: > > ===Cut==> > # zpool list gamestop > NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT > gamestop 5,22T 4,38T 861G - 24% 83% 1.00x ONLINE - > > ===Cut==> > Why 5.22T ? If zpool is displaying raw size, it should be 960 x 6 = 5760 Gb > = 5.65 T. If it's displaying the actual data, then it should be 960 x 5 > 4800 Gb = 4.68 T. 5.22 T is neither of these. I'm stuck, please explain. :) > > > Thanks. > > Eugene.It's raw size, but the discrepancy is between 1000 and 1024. Smartctl is reporting base 10 size, but zpool is reporting base 1024.. 960197124096.0*6/1024**4 = 5.24 TB, which is pretty close to what zpool says. -Alan
On Sun, Oct 16, 2016 at 09:56:10PM +0500, Eugene M. Zheganin wrote:> Hi. > > FreeBSD 11.0-RC1 r303979, zfs raidz1: > > ===Cut==> > # zpool status gamestop > pool: gamestop > state: ONLINE > scan: none requested > config: > > NAME STATE READ WRITE CKSUM > gamestop ONLINE 0 0 0 > raidz1-0 ONLINE 0 0 0 > da0 ONLINE 0 0 0 > da1 ONLINE 0 0 0 > da2 ONLINE 0 0 0 > da3 ONLINE 0 0 0 > da4 ONLINE 0 0 0 > da5 ONLINE 0 0 0 > > ===Cut==> > 6 disks 960 Gbs each: > > ===Cut==> > # smartctl -a /dev/da0 > smartctl 6.5 2016-05-07 r4318 [FreeBSD 11.0-RC1 amd64] (local build) > Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org > > === START OF INFORMATION SECTION ==> Model Family: Samsung based SSDs > Device Model: SAMSUNG MZ7KM960HAHP-00005 > Serial Number: S2HTNX0H507466 > LU WWN Device Id: 5 002538 c402bdac1 > Firmware Version: GXM1003Q > User Capacity: 960 197 124 096 bytes [960 GB]You're confusing disk manufacturer gigabytes with real (power of two) gigabytes. The below turns 960 197 124 096 into real gigabytes % bc scale = 4 960197124096 / 1024 / 1024 / 1024 894.2532> Sector Size: 512 bytes logical/physical > > [...] > > ===Cut==> > But: > > ===Cut==> > # zpool list gamestop > NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT > gamestop 5,22T 4,38T 861G - 24% 83% 1.00x ONLINE - > > ===Cut==> > Why 5.22T ? If zpool is displaying raw size, it should be 960 x 6 = 5760 > Gb = 5.65 T. If it's displaying the actual data, then it should be 960 x > 5 = 4800 Gb = 4.68 T. 5.22 T is neither of these. I'm stuck, please > explain. :)Take 6 disks, size calculated above, and turn that into power of two TB: 894.2532 * 6 / 1024 5.2397 Close enough to 5.22, especially after ZFS has some overhead for it's own data structures Regards, Gary