Hi,
with the kind help from some of you on this list, I am finally
formatting the filesystem.
I'd be grateful if any of you would like to comment on my chosen
chunk/stripe/stride/ etc values, as from tomorrow I will be loading TBs
of 400MB images onto this system, so would prefer to be coerced into
making changes before then.
Thanks & regards,
Zoltan
*** Setup:
8 * 5900RPM Seagte 2TB drives on SiI3132 PCIx x1 card.
Linux gs0 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:52:42 UTC 2010
x86_64 GNU/Linux
mdadm - v3.1.4 - 31st August 2010
LVM version: 2.02.54(1) (2009-10-26)
Library version: 1.02.39 (2009-10-26)
Driver version: 4.15.0
mke2fs 1.41.11 (14-Mar-2010)
*** Commands used:
mdadm --create /dev/md0 --metadata=1.2 --auto=md --assume-clean
--bitmap=internal --bitmap-chunk=131072 --chunk=512 --level=6
--raid-devices=8 /dev/sd[abcdefgh]
mdadm --detail --scan >> /etc/mdadm.conf
mdadm --assemble /dev/md0
pvcreate --metadatasize 512 /dev/md0
vgcreate geo_vg0 /dev/md0
lvcreate -n geo_lvm0 -l 100%FREE geo_vg0
mkfs -t ext4 -m 1-b 4096 -E stride=128,stripe-width=768
/dev/geo_vg0/geo_lvm0
*** Results:
root@gs0:/home/geograph# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Tue Nov 16 17:28:37 2010
Raid Level : raid6
Array Size : 11721077760 (11178.09 GiB 12002.38 GB)
Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
Raid Devices : 8
Total Devices : 8
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Tue Nov 16 19:44:10 2010
State : active
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : gs0:0 (local to host gs0)
UUID : c35e7642:7d78c385:61a26db1:89a5ace5
Events : 3
Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 8 32 2 active sync /dev/sdc
3 8 48 3 active sync /dev/sdd
4 8 64 4 active sync /dev/sde
5 8 80 5 active sync /dev/sdf
6 8 96 6 active sync /dev/sdg
7 8 112 7 active sync /dev/sdh
root@gs0:/home/geograph#
*******************************************************************
root@gs0:/home/geograph# pvdisplay
--- Physical volume ---
PV Name /dev/md0
VG Name geo_vg0
PV Size 10.92 TiB / not usable 0
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 2861463
Free PE 0
Allocated PE 2861463
PV UUID oE4Itq-rAwe-RQzK-JTnn-XAVk-vObv-ORx5HO
root@gs0:/home/geograph# vgdisplay
--- Volume group ---
VG Name geo_vg0
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 10.92 TiB
PE Size 4.00 MiB
Total PE 2861463
Alloc PE / Size 2861463 / 10.92 TiB
Free PE / Size 0 / 0
VG UUID 0S3VyN-aMu4-U60o-hz3z-R6RL-hGUd-nJHCTg
root@gs0:/home/geograph# lvdisplay
--- Logical volume ---
LV Name /dev/geo_vg0/geo_lvm0
VG Name geo_vg0
LV UUID dnhY9R-mGO3-oRg6-0EP7-i6kt-2dIW-R9028r
LV Write Access read/write
LV Status available
# open 1
LV Size 10.92 TiB
Current LE 2861463
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 12288
Block device 252:0
root@gs0:/home/geograph#
*********************************************************
root@gs0:/home/geograph# echo `date` > zz_mkfs ; mkfs -t ext4 -m 1 -b
4096 -E stride=128,stripe-width=768 /dev/geo_vg0/geo_lvm0 ; echo `date`
>> zz_mkfs
mke2fs 1.41.11 (14-Mar-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=768 blocks
732536832 inodes, 2930138112 blocks
29301381 blocks (1.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
89421 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632,
2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616,
78675968,
102400000, 214990848, 512000000, 550731776, 644972544, 1934917632,
2560000000
[still running]
--
===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
P.O. Box 7, Muizenberg 7950, South Africa.
65 Main Road, Muizenberg 7945
Western Cape, South Africa.
34° 6'16.35"S 18°28'5.62"E
Tel: +27-21-7884897 Mobile: +27-83-6004028
Fax: +27-86-6115323 www.geograph.co.za
===========================================
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