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| Drive Name | Firmware | Capacity | Installed On |
|---|---|---|---|
| Samsung 850 PRO | EXM02B6Q | 256GB | rc01 |
| Crucial M4 CT128M4SSD2 | 0309 | 128GB | rc21 |
| Intel 5120 SSDSC2CW120A3 | 400i | 120GB | rcmonster |
| Crucial M550 Crucial_CT1024M550SSD1 | MU01 | 1TB | rcmonster |
| Western Digital 7200RPM WD1002FBYS-02A6B0 | 03.00C06 | 1TB | rcmaster |
...
Results
Raw
| Drive Name/Model | Firmware | Write Cache | Filesystem | TRIM | 512B Write Latency (ms) |
|---|---|---|---|---|---|
| Samsung 850 PRO 256 GB on rc01 | EXM02B6Q | Enabled | RAW | - | 3.10 |
| Ext4 | Yes | ~8 | |||
| Ext4 | No | ~8 | |||
| XFS | Yes | 6.2 | |||
| XFS | No | 6.2 | |||
| Disabled | RAW | n/a | 2.9 | ||
| Ext4 | Yes | 10.5 | |||
| Ext4 | No | 10.5 | |||
| XFS | Yes | 6.05 | |||
| XFS | No | 6.06 | |||
| Crucial 128GB M4 - CT128M4SSD2 on rc21 | 0309 | Enabled | RAW | - | 3.76 |
| Ext4 | Yes | 7.8 | |||
| No | 8.2 | ||||
| XFS | Yes | 5.7 | |||
| No | 5.4 | ||||
| Disabled | RAW | - | 1.3 | ||
| Ext4 | Yes | 4.3 | |||
| No | 4.5 | ||||
| XFS | Yes | 2.8 | |||
| No | 2.8 | ||||
Intel 520 120GB SSDSC2CW120A3 on rcmonster | 400i | Enabled | RAW | - | 0.44 |
| Ext4 | Yes | 0.96 | |||
| No | 0.96 | ||||
| XFS | Yes | 0.88 | |||
| No | 0.88 | ||||
| Disabled | RAW | - | 0.048 | ||
| Ext4 | Yes | 0.25 | |||
| No | 0.24 | ||||
| XFS | Yes | 0.13 | |||
| No | 0.13 | ||||
| Crucial M550 1TB Crucial_CT1024M550SSD1 on rcmonster | MU01 | Enabled | RAW | - | 4.2 |
| Ext4 | Yes | 8.7 | |||
| No | 8.7 | ||||
| XFS | Yes | 8.6 | |||
| No | 8.6 | ||||
| Disabled | RAW | - | 2.0 | ||
| Ext4 | Yes | 6.1 | |||
| No | 6.1 | ||||
| XFS | Yes | 4.0 | |||
| No | 4.0 | ||||
| WD 7200RPM HDD WD1002FBYS-02A6B0 | 03.00C06 | Enabled | RAW | - | 8.5 |
| Ext4 | Yes | 40.1 | |||
| No | 41.3 | ||||
| XFS | Yes | 31 | |||
| No | 31 | ||||
| Disabled | RAW | - | 8.5 | ||
| Ext4 | Yes | 42.5 | |||
| No | 41.2 | ||||
| XFS | Yes | 30 | |||
| No | 30 |
...
All times are in milliseconds and +WC means with Write Cached Enabled, -WC means with Write Cached Disabled.
| Drive | RAW + WC | Ext4 + WC | XFS + WC | RAW - WC | Ext4 - WC | XFS - WC |
|---|---|---|---|---|---|---|
Samsung 850 PRO 256 GB | 3.1 | 8 | 6.2 | 2.9 | 10.5 | 6.05 |
| Crucial M4 128GB on rc21 | 3.76 | 8 | 5.5 | 1.3 | 4.4 | 2.8 |
| Intel 520 120GB on rcmonster | 0.44 | 0.96 | 0.88 | 0.048 | 0.25 | 0.13 |
| Crucial 550 1TB on rcmonster | 4.2 | 8.7 | 8.6 | 2.0 | 6.1 | 4.0 |
| Western Digital 7200RPM on rcmaster | 8.5 | 40.1 | 31 | 8.5 | 42 | 30
|
Write Cache Effects
Final comparison between the bandwidth + latency of enabling/disbling the Write Cache on a RAW device
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