Some of our machines have five 500gb disks configured into a single raid5 system. The cases that these disks are in have three empty slots. I’ve just added three more 500gb disks and configured these into another raid. The size of this raid will only be 1tb, but we’re pretty short on disk space, so that’s ok.
[root@cdfs tw_cli]# ./tw_cli //cdfs> info Ctl Model Ports Drives Units NotOpt RRate VRate BBU ------------------------------------------------------------------------ c8 9650SE-8LPML 8 8 1 0 4 4 - //cdfs> info c8 Unit UnitType Status %Cmpl Stripe Size(GB) Cache AVerify IgnECC ------------------------------------------------------------------------------ u0 RAID-5 OK - 64K 1862.61 ON OFF OFF Port Status Unit Size Blocks Serial --------------------------------------------------------------- p0 OK u0 465.76 GB 976773168 WD-WCAPW2252807 p1 OK u0 465.76 GB 976773168 WD-WCAPW2071371 p2 OK u0 465.76 GB 976773168 WD-WCAPW2252305 p3 OK u0 465.76 GB 976773168 WD-WCAPW2252370 p4 OK u0 465.76 GB 976773168 WD-WCAPW2252832 p5 OK - 465.76 GB 976773168 WD-WCAPW1478014 p6 OK - 465.76 GB 976773168 WD-WCAPW1478552 p7 OK - 465.76 GB 976773168 WD-WCAPW1478397 //cdfs> /c8 add type=raid5 disk=5:6:7 Creating new unit on controller /c8 ... Done. The new unit is /c8/u1. Setting write cache=ON for the new unit ... Done. Warning: You do not have a battery backup unit for /c8/u1 and the enabled write cache (default) may cause data loss in the event of power failure. Setting default Command Queuing Policy for unit /c8/u1 to [off] ... Done. //cdfs> info c8 Unit UnitType Status %Cmpl Stripe Size(GB) Cache AVerify IgnECC ------------------------------------------------------------------------------ u0 RAID-5 OK - 64K 1862.61 ON OFF OFF u1 RAID-5 OK - 64K 931.303 ON OFF OFF Port Status Unit Size Blocks Serial --------------------------------------------------------------- p0 OK u0 465.76 GB 976773168 WD-WCAPW2252807 p1 OK u0 465.76 GB 976773168 WD-WCAPW2071371 p2 OK u0 465.76 GB 976773168 WD-WCAPW2252305 p3 OK u0 465.76 GB 976773168 WD-WCAPW2252370 p4 OK u0 465.76 GB 976773168 WD-WCAPW2252832 p5 OK u1 465.76 GB 976773168 WD-WCAPW1478014 p6 OK u1 465.76 GB 976773168 WD-WCAPW1478552 p7 OK u1 465.76 GB 976773168 WD-WCAPW1478397
Now create a filesystem on this new raid.
[root@cdfs local]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 121573.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): p
Disk /dev/sdb: 999.9 GB, 999978696704 bytes
255 heads, 63 sectors/track, 121573 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-121573, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-121573, default 121573):
Using default value 121573
Command (m for help): p
Disk /dev/sdb: 999.9 GB, 999978696704 bytes
255 heads, 63 sectors/track, 121573 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 121573 976535091 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@cdfs local]# mkfs.ext3 -m0 -E stride=32 -j -O dir_index,resize_inode,spar se_super /dev/sdb1
mke2fs 1.35 (28-Feb-2004)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
122077184 inodes, 244133772 blocks
0 blocks (0.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=247463936
7451 block groups
32768 blocks per group, 32768 fragments per group
16384 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
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 26 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@cdfs local]# tune2fs -c0 -i0 /dev/sdb1
tune2fs 1.35 (28-Feb-2004)
Setting maximal mount count to -1
Setting interval between check 0 seconds
Now mount and export the disk.