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SSD speed using ODD bay


MikePort
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Hello everyone,
 
I have a HP Microserver Gen8:
- G2020T processor
- 10GB RAM
- 1 x SSD Kingston 60GB SATA-III 2.5 inch V300 in the ODD bay for OS (CentOS Server)
- 4 x Wd Blue 1TB in the four drive bays for media( software Raid 10 with mdadm - Linux Software RAID )
- AHCI mode in Bios
 
Usage:
- media Server (serviio)
- file sharing (samba)
- video monitoring and recording for 2 IP cameras (motion)
- monitoring (nagios)
- backup server (backuppc)
 
I'm not sure if the SSD/HDD performance is good and I couldn't find linux benchmarks in the forums to compare the results. Bellow are my results (using hdparm and dd):
 
1. SSD (SATA2)

[root@HP ~]# hdparm -tT /dev/sde

  /dev/sde:
 Timing cached reads:   11922 MB in  2.00 seconds = 5964.42 MB/sec
 Timing buffered disk reads: 604 MB in  3.00 seconds = 201.05 MB/sec

[root@HP ~]# dd if=/dev/zero of=/root/tempfile bs=2M count=10000 conv=fdatasync,notrunc
10000+0 records in
10000+0 records out
20971520000 bytes (21 GB) copied, 85.1146 s, 246 MB/s

2. HDD (software SATA 10)

 


[root@HP ~]# hdparm -tT /dev/md1

/dev/md1:
 Timing cached reads:   11682 MB in  2.00 seconds = 5844.44 MB/sec
 Timing buffered disk reads: 1102 MB in  3.01 seconds = 366.72 MB/sec

[root@HP ~]# dd if=/dev/zero of=/mnt/Public/tempfile bs=2M count=10000 conv=fdatasync,notrunc
10000+0 records in
10000+0 records out
20971520000 bytes (21 GB) copied, 73.2416 s, 286 MB/s

Is there a setting that I'm missing or SSD speed should be closer to 3.0 Gbps ?

Also I want to setup another software array - RAID1 this time, using the first 2 drive bays (SATA-3). I want to check if disk speed is closer to 6.0 Gbps.

 

 

Regards,

Mike

Edited by MikePort
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For your SSD, 246MB/s is about the highest speed you will see on a SATA II port.

The sustained transfer rate of a WD Blue drive is 150MB/s. If you RAID 1 a pair of them on the SATA III ports, you will get around 150MB/s.

Your RAID 10 speed of 286MB/s is seems accurate.

RAID 0 would make your drive set faster, but there is no resiliency in RAID 0. 

Depending on how much you are going to do at the same time, I think your performance stats above are good enough for media and file serving.

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