RAID on SSD's
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@ccwtech said in RAID on SSD's:
So for greater redundancy RAID 10?
Is the reason for 5 vs. 10 just the cost of the extra drive?
Yes, it's a much bigger cost on SSDs.
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@ccwtech said in RAID on SSD's:
Would a RAID 6 be better for the extra redundancy?
RAID isn't that simple. Does the cost for extra parity make sense?
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@scottalanmiller said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
Would a RAID 6 be better for the extra redundancy?
RAID isn't that simple. Does the cost for extra parity make sense?
Was looking at the fact that you can lose 2 drives (not just one) as an extra safeguard. But in a 4 drive SSD RAID 10 makes more sense to me than 6.
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@ccwtech said in RAID on SSD's:
@scottalanmiller said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
Would a RAID 6 be better for the extra redundancy?
RAID isn't that simple. Does the cost for extra parity make sense?
Was looking at the fact that you can lose 2 drives (not just one) as an extra safeguard. But in a 4 drive SSD RAID 10 makes more sense to me than 6.
It does, but you have to invest in double the HD's for the same capacity. If redundancy is your only concern then Raid 10.
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@ccwtech said in RAID on SSD's:
@scottalanmiller said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
Would a RAID 6 be better for the extra redundancy?
RAID isn't that simple. Does the cost for extra parity make sense?
Was looking at the fact that you can lose 2 drives (not just one) as an extra safeguard. But in a 4 drive SSD RAID 10 makes more sense to me than 6.
That's not a way to measure RAID reliability. I actually a video about why we never mention "number of lost drives" in the SAMIT queue.
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@scottalanmiller said in RAID on SSD's:
That's not a way to measure RAID reliability. I actually a video about why we never mention "number of lost drives" in the SAMIT queue.
Which one? You have several RAID videos.
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@ccwtech said in RAID on SSD's:
@scottalanmiller said in RAID on SSD's:
That's not a way to measure RAID reliability. I actually a video about why we never mention "number of lost drives" in the SAMIT queue.
Which one? You have several RAID videos.
It's in the queue, not visible yet. It's specifically about why we don't look at "how many drives can be lost"
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@scottalanmiller said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
@scottalanmiller said in RAID on SSD's:
That's not a way to measure RAID reliability. I actually a video about why we never mention "number of lost drives" in the SAMIT queue.
Which one? You have several RAID videos.
It's in the queue, not visible yet. It's specifically about why we don't look at "how many drives can be lost"
Ahhh, ok. -
@francesco-provino said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
I set up my servers with RAID 10 and 10 or 15 K RPM Drives and a dedicated RAID card and an SSD Drive for CacheCade.
However with the decrease in pricing for SSD drives, I would like to start using them more in servers.
- Still do RAID 10 with SSD's?
- Is a dedicated RAID card still needed if using SSD's?
- Usually RAID 5 makes sense. Still RAID 10 if you want maximum performance. Be aware that you can saturate almost any SATA/SAS controller with the performances of 6-7 SSD.
- Apply the same consideration for the HDD.
I actually came here to ask about #1 - is that 6 drives in raid10? Has anyone measured this / tested it etc?
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@ccwtech said in RAID on SSD's:
@scottalanmiller said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
@scottalanmiller said in RAID on SSD's:
That's not a way to measure RAID reliability. I actually a video about why we never mention "number of lost drives" in the SAMIT queue.
Which one? You have several RAID videos.
It's in the queue, not visible yet. It's specifically about why we don't look at "how many drives can be lost"
Ahhh, ok.I just looked, looks like it is actually on schedule for tomorrow!
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Nice!
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@mattspeller said in RAID on SSD's:
@francesco-provino said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
I set up my servers with RAID 10 and 10 or 15 K RPM Drives and a dedicated RAID card and an SSD Drive for CacheCade.
However with the decrease in pricing for SSD drives, I would like to start using them more in servers.
- Still do RAID 10 with SSD's?
- Is a dedicated RAID card still needed if using SSD's?
- Usually RAID 5 makes sense. Still RAID 10 if you want maximum performance. Be aware that you can saturate almost any SATA/SAS controller with the performances of 6-7 SSD.
- Apply the same consideration for the HDD.
I actually came here to ask about #1 - is that 6 drives in raid10? Has anyone measured this / tested it etc?
Yes, xByte tested that. It saturated REALLY low.
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@scottalanmiller said in RAID on SSD's:
@mattspeller said in RAID on SSD's:
@francesco-provino said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
I set up my servers with RAID 10 and 10 or 15 K RPM Drives and a dedicated RAID card and an SSD Drive for CacheCade.
However with the decrease in pricing for SSD drives, I would like to start using them more in servers.
- Still do RAID 10 with SSD's?
- Is a dedicated RAID card still needed if using SSD's?
- Usually RAID 5 makes sense. Still RAID 10 if you want maximum performance. Be aware that you can saturate almost any SATA/SAS controller with the performances of 6-7 SSD.
- Apply the same consideration for the HDD.
I actually came here to ask about #1 - is that 6 drives in raid10? Has anyone measured this / tested it etc?
Yes, xByte tested that. It saturated REALLY low.
That's interesting. I didn't know that.
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@scottalanmiller said in RAID on SSD's:
@mattspeller said in RAID on SSD's:
@francesco-provino said in RAID on SSD's:
@ccwtech said in RAID on SSD's:
I set up my servers with RAID 10 and 10 or 15 K RPM Drives and a dedicated RAID card and an SSD Drive for CacheCade.
However with the decrease in pricing for SSD drives, I would like to start using them more in servers.
- Still do RAID 10 with SSD's?
- Is a dedicated RAID card still needed if using SSD's?
- Usually RAID 5 makes sense. Still RAID 10 if you want maximum performance. Be aware that you can saturate almost any SATA/SAS controller with the performances of 6-7 SSD.
- Apply the same consideration for the HDD.
I actually came here to ask about #1 - is that 6 drives in raid10? Has anyone measured this / tested it etc?
Yes, xByte tested that. It saturated REALLY low.
http://www.xbyte.com/blog/testing-the-limits-of-the-dell-h710-raid-controller-with-ssd/
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@ccwtech said in RAID on SSD's:
@scottalanmiller said in RAID on SSD's:
That's not a way to measure RAID reliability. I actually a video about why we never mention "number of lost drives" in the SAMIT queue.
Which one? You have several RAID videos.
It posted.
