Hello everyone
I have finally got around to building my "final" NAS, comprised of 6x WD red 4TB drives in raid6, using a LSI 9211-8i controller card (dumb).
I have built the storage partition using RAID6 across all 6 disks, giving 14.5Tb of storage. when the raid was initialised, it took around 12 hours.
OMV is at version 1.6 and is untweaked. the server has 8gb ram and currently a single socket quad core xeon 5500 running at 2.26ghz
root@OMV:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid6 sdd[0] sdf[5] sdb[4] sdc[3] sda[2] sde[1]
15627548672 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU]
unused devices: <none>
root@OMV:~#
DD testing reads
root@OMV:~# dd if=/dev/md0 of=tempfile bs=1MB count=50240
50240+0 records in
50240+0 records out
50240000000 bytes (50 GB) copied, 653.376 s, 76.9 MB/s
CPU usage whilst running the above
32143 root 20 0 10856 1428 580 D [b] 25.9 [/b] 0.0 0:47.56 dd
53 root 20 0 0 0 0 S [b] 6.5[/b] 0.0 0:25.37 kswapd0
1059 root 20 0 0 0 0 D[b] 6.5[/b] 0.0 0:20.54 flush-8:96
DD testing writes
root@OMV:~# dd of=/dev/md0 if=tempfile bs=1MB count=50240
10240+0 records in
10240+0 records out
10240000000 bytes (10 GB) copied, 47.7949 s, 214 MB/s
the drives are all 4k and according to my interpretation of fdisk -l they are operating in 4k mode. sdg is the boot SSD
Disk /dev/sdg: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders, total 234441648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ee673
Device Boot Start End Blocks Id System
/dev/sdg1 2048 224860159 112429056 83 Linux
/dev/sdg2 224862206 234440703 4789249 5 Extended
/dev/sdg5 224862208 234440703 4789248 82 Linux swap / Solaris
Disk /dev/sdc: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders, total 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/sdc doesn't contain a valid partition table
Disk /dev/sda: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders, total 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/sda doesn't contain a valid partition table
Disk /dev/sdd: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders, total 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/sdd doesn't contain a valid partition table
Disk /dev/sdb: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders, total 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/sde: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders, total 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/sde doesn't contain a valid partition table
Disk /dev/sdf: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders, total 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/sdf doesn't contain a valid partition table
Disk /dev/md0: 16002.6 GB, 16002609840128 bytes
2 heads, 4 sectors/track, -388080128 cylinders, total 31255097344 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 524288 bytes / 2097152 bytes
Disk identifier: 0x00000000
Disk /dev/md0 doesn't contain a valid partition table
Alles anzeigen
everything looks ok to me? i havent found that much info from people running RAID6, so hopefully this post will help shed a little light on expected performance levels.