Unusual slow SSD on RAID 0 performance
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I'm using a ThunderBay 4 external enclosure as my main storage and backup unit. Recently I bought two 1TB Samsung EVO 860 SSD to improve performance of my data drives. I installed them using NewerTech adaptors and formatted them in RAID 0 using Disk Utility RAID assistant. (I already tried with OWC RAID software with same results)
So I have:
- The two first bays with the SSDs in RAID 0 (for data)
- The following two with 2TB HD in RAID 0 (for backups)
The problem is that I'm getting write speeds of around 100MB/s on the data RAID when I should be getting around 800MB/s.
Read speeds are as expected, around 750MB/s.
Without RAID, the same happens, I get around 500MB/s read speed but only 100MB/s write speeds.
Any idea of what could be causing this?
UPDATE:
After trying with all available chunk sizes (from 32k to 256k) for the RAID, still getting the same results.
Extra inforamtion
- Using 15" MacBookPro13,3 (2016)
- MacOS Mojave 10.14.1
- Measured with both BlackMagic Disk speed test and iStatus menus.
- Drives firmware revision: RVT01B6Q
macos hard-drive ssd performance raid
asked Dec 6 at 10:35
Pablo Lorenzo
236
|
show 3 more comments
up vote
0
down vote
favorite
I'm using a ThunderBay 4 external enclosure as my main storage and backup unit. Recently I bought two 1TB Samsung EVO 860 SSD to improve performance of my data drives. I installed them using NewerTech adaptors and formatted them in RAID 0 using Disk Utility RAID assistant. (I already tried with OWC RAID software with same results)
So I have:
- The two first bays with the SSDs in RAID 0 (for data)
- The following two with 2TB HD in RAID 0 (for backups)
The problem is that I'm getting write speeds of around 100MB/s on the data RAID when I should be getting around 800MB/s.
Read speeds are as expected, around 750MB/s.
Without RAID, the same happens, I get around 500MB/s read speed but only 100MB/s write speeds.
Any idea of what could be causing this?
UPDATE:
After trying with all available chunk sizes (from 32k to 256k) for the RAID, still getting the same results.
Extra inforamtion
- Using 15" MacBookPro13,3 (2016)
- MacOS Mojave 10.14.1
- Measured with both BlackMagic Disk speed test and iStatus menus.
- Drives firmware revision: RVT01B6Q
macos hard-drive ssd performance raid
asked Dec 6 at 10:35
Pablo Lorenzo
236
1
Firstly check the firmware. Also manually run trim on them.
– davidbaumann
Dec 6 at 10:47
I updated the post to reflect the firmware version, I doesn't look that there is an update on Samsung website. Now I'm trying to find how to run trim in an external drive
– Pablo Lorenzo
Dec 6 at 11:23
Actually I only know how to update the firmware using Samsung Magician...
– davidbaumann
Dec 6 at 12:41
@PabloLorenzo - Depending on the controller, it might not support TRIM, have you contacted the manufacturer for assistance?
– Ramhound
Dec 6 at 19:09
1
Do both RAID volumes behave the same? I assume without the new SSDs you got the high writing speed? I assume the HDs/SSDs in use are SATA? Can you attach them directly to a e/SATA controller an measure the MB/s (without the raid or any other interface in between)?
– Albin
Dec 12 at 15:03
|
show 3 more comments
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm using a ThunderBay 4 external enclosure as my main storage and backup unit. Recently I bought two 1TB Samsung EVO 860 SSD to improve performance of my data drives. I installed them using NewerTech adaptors and formatted them in RAID 0 using Disk Utility RAID assistant. (I already tried with OWC RAID software with same results)
So I have:
- The two first bays with the SSDs in RAID 0 (for data)
- The following two with 2TB HD in RAID 0 (for backups)
The problem is that I'm getting write speeds of around 100MB/s on the data RAID when I should be getting around 800MB/s.
Read speeds are as expected, around 750MB/s.
Without RAID, the same happens, I get around 500MB/s read speed but only 100MB/s write speeds.
Any idea of what could be causing this?
UPDATE:
After trying with all available chunk sizes (from 32k to 256k) for the RAID, still getting the same results.
Extra inforamtion
- Using 15" MacBookPro13,3 (2016)
- MacOS Mojave 10.14.1
- Measured with both BlackMagic Disk speed test and iStatus menus.
- Drives firmware revision: RVT01B6Q
macos hard-drive ssd performance raid
asked Dec 6 at 10:35
Pablo Lorenzo
236
I'm using a ThunderBay 4 external enclosure as my main storage and backup unit. Recently I bought two 1TB Samsung EVO 860 SSD to improve performance of my data drives. I installed them using NewerTech adaptors and formatted them in RAID 0 using Disk Utility RAID assistant. (I already tried with OWC RAID software with same results)
So I have:
- The two first bays with the SSDs in RAID 0 (for data)
- The following two with 2TB HD in RAID 0 (for backups)
The problem is that I'm getting write speeds of around 100MB/s on the data RAID when I should be getting around 800MB/s.
Read speeds are as expected, around 750MB/s.
Without RAID, the same happens, I get around 500MB/s read speed but only 100MB/s write speeds.
Any idea of what could be causing this?
UPDATE:
After trying with all available chunk sizes (from 32k to 256k) for the RAID, still getting the same results.
Extra inforamtion
- Using 15" MacBookPro13,3 (2016)
- MacOS Mojave 10.14.1
- Measured with both BlackMagic Disk speed test and iStatus menus.
- Drives firmware revision: RVT01B6Q
macos hard-drive ssd performance raid
macos hard-drive ssd performance raid
asked Dec 6 at 10:35
Pablo Lorenzo
236
asked Dec 6 at 10:35
Pablo Lorenzo
236
edited Dec 6 at 18:21
asked Dec 6 at 10:35
Pablo Lorenzo
236
asked Dec 6 at 10:35
Pablo Lorenzo
236
asked Dec 6 at 10:35
Pablo Lorenzo
236
236
1
Firstly check the firmware. Also manually run trim on them.
– davidbaumann
Dec 6 at 10:47
I updated the post to reflect the firmware version, I doesn't look that there is an update on Samsung website. Now I'm trying to find how to run trim in an external drive
– Pablo Lorenzo
Dec 6 at 11:23
Actually I only know how to update the firmware using Samsung Magician...
– davidbaumann
Dec 6 at 12:41
@PabloLorenzo - Depending on the controller, it might not support TRIM, have you contacted the manufacturer for assistance?
– Ramhound
Dec 6 at 19:09
1
Do both RAID volumes behave the same? I assume without the new SSDs you got the high writing speed? I assume the HDs/SSDs in use are SATA? Can you attach them directly to a e/SATA controller an measure the MB/s (without the raid or any other interface in between)?
– Albin
Dec 12 at 15:03
|
show 3 more comments
1
Firstly check the firmware. Also manually run trim on them.
– davidbaumann
Dec 6 at 10:47
I updated the post to reflect the firmware version, I doesn't look that there is an update on Samsung website. Now I'm trying to find how to run trim in an external drive
– Pablo Lorenzo
Dec 6 at 11:23
Actually I only know how to update the firmware using Samsung Magician...
– davidbaumann
Dec 6 at 12:41
@PabloLorenzo - Depending on the controller, it might not support TRIM, have you contacted the manufacturer for assistance?
– Ramhound
Dec 6 at 19:09
1
Do both RAID volumes behave the same? I assume without the new SSDs you got the high writing speed? I assume the HDs/SSDs in use are SATA? Can you attach them directly to a e/SATA controller an measure the MB/s (without the raid or any other interface in between)?
– Albin
Dec 12 at 15:03
1
1
Firstly check the firmware. Also manually run trim on them.
– davidbaumann
Dec 6 at 10:47
Firstly check the firmware. Also manually run trim on them.
– davidbaumann
Dec 6 at 10:47
I updated the post to reflect the firmware version, I doesn't look that there is an update on Samsung website. Now I'm trying to find how to run trim in an external drive
– Pablo Lorenzo
Dec 6 at 11:23
I updated the post to reflect the firmware version, I doesn't look that there is an update on Samsung website. Now I'm trying to find how to run trim in an external drive
– Pablo Lorenzo
Dec 6 at 11:23
Actually I only know how to update the firmware using Samsung Magician...
– davidbaumann
Dec 6 at 12:41
Actually I only know how to update the firmware using Samsung Magician...
– davidbaumann
Dec 6 at 12:41
@PabloLorenzo - Depending on the controller, it might not support TRIM, have you contacted the manufacturer for assistance?
– Ramhound
Dec 6 at 19:09
@PabloLorenzo - Depending on the controller, it might not support TRIM, have you contacted the manufacturer for assistance?
– Ramhound
Dec 6 at 19:09
1
1
Do both RAID volumes behave the same? I assume without the new SSDs you got the high writing speed? I assume the HDs/SSDs in use are SATA? Can you attach them directly to a e/SATA controller an measure the MB/s (without the raid or any other interface in between)?
– Albin
Dec 12 at 15:03
Do both RAID volumes behave the same? I assume without the new SSDs you got the high writing speed? I assume the HDs/SSDs in use are SATA? Can you attach them directly to a e/SATA controller an measure the MB/s (without the raid or any other interface in between)?
– Albin
Dec 12 at 15:03
|
show 3 more comments
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1
Firstly check the firmware. Also manually run trim on them.
– davidbaumann
Dec 6 at 10:47
I updated the post to reflect the firmware version, I doesn't look that there is an update on Samsung website. Now I'm trying to find how to run trim in an external drive
– Pablo Lorenzo
Dec 6 at 11:23
Actually I only know how to update the firmware using Samsung Magician...
– davidbaumann
Dec 6 at 12:41
@PabloLorenzo - Depending on the controller, it might not support TRIM, have you contacted the manufacturer for assistance?
– Ramhound
Dec 6 at 19:09
1
Do both RAID volumes behave the same? I assume without the new SSDs you got the high writing speed? I assume the HDs/SSDs in use are SATA? Can you attach them directly to a e/SATA controller an measure the MB/s (without the raid or any other interface in between)?
– Albin
Dec 12 at 15:03