Storage Question
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How risk averse are you? How much does disk speed impact your environment?
edit: Welcome!! Good first post.
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Well, we're a smaller company, so we could probably be down for a day or so.
We also have pretty good backups.
Not sure about the disk speed requirement, to be honest. Always just assumed go big!
Oh and thanks for the welcome. I hope it was a good first post, ha ha!
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Hi BRRABill if you can swing it why not got for a RAID 5 out of SSD's. SSD's aren't subject to the same failings of classic Spinning Rust.
I wouldn't trash the drives, might need them for something.
I wouldn't consider buying Spinning Rust ever at this point. Everything comes with SSD's or I buy SSD's and put them in myself. (See a lot of my topics as of recently)
15K SAS drives are around, but expensive
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@BRRABill said:
Not sure about the disk speed requirement, to be honest. Always just assumed go big!
I'd look into your IOPS. I'd say it's fairly low though.
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@BRRABill said:
- Considering what I already have and our requirements, would it just make sense to buy a few more 7.2K drives and make a RAID 10 array out of them? Is there a huge performance difference between those two arrays? (7.2K vs. 10K both in a RAID 10.)
4 at 7.2k can still be fairly slow. The bigger the array the faster it will be.
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@BRRABill said:
- Sub question: where did 15K SAS drives go? DELL doesn't really offer them any more.
Firstly - welcome to the boards.
Where did they go - they've been more less replaced by SSD. They are so expensive that you get better performance for dollar with SSD.
Where are the errors coming from with these SSD's installed? Is the PERC controller given them because the drives aren't Dell Drives?
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My concern is more not knowing if anything is going wrong with the drives.
Or having to look at these stupid flashing lights all day. (<= kidding)
I thought RAID 5 was frowned upon these days?
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I thought of one more question:
A lot of the talk of the enterprise SSD and battery on PERC cards revolves around power loss.
But why is that an issue if the server (probably) has a UPS and shutdown?
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@BRRABill said:
My concern is more not knowing if anything is going wrong with the drives.
Or having to look at these stupid flashing lights all day. (<= kidding)
I thought RAID 5 was frowned upon these days?
RAID 5 on spinning rust is. RAID 5 SSD is AOKAY
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@BRRABill said:
My concern is more not knowing if anything is going wrong with the drives.
Or having to look at these stupid flashing lights all day. (<= kidding)
I thought RAID 5 was frowned upon these days?
Only for HDDs, not SSD.
Have you updated the PERC Raid firmware?
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@BRRABill said:
I thought RAID 5 was frowned upon these days?
The problems with RAID 5 on spinning disks are UREs and the amount of time it takes to rebuild the new drive. SSDs don't suffer either of these issues, so it's back on the table.
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@BRRABill said:
I thought of one more question:
A lot of the talk of the enterprise SSD and battery on PERC cards revolves around power loss.
But why is that an issue if the server (probably) has a UPS and shutdown?
What happens if the power supply in the server dies? You still want something to backup the cache on the controller card to cover this instance. The other option is a controller with flash memory instead of cache.
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Yes, everything in the server is totally updated firmware-wise.
Pretty sure it's just an issue of it being a non-DELL drive. I read a lot of drives from other manufacturers were exhibiting the same symptoms.
I guess some SSDs work, and some don't. Kingston has been good with working with me, but this might not be fixable on their end.
I guess that would be ANOTHER question ... anyone using 3rd party SSDs that work with DELL servers?
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@Dashrender said:
What happens if the power supply in the server dies? You still want something to backup the cache on the controller card to cover this instance.
Ah, good point. Possibly a reason they go with the H710 then! And enterprise-class SSDs with power protection.
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@BRRABill said:
I thought RAID 5 was frowned upon these days?
On spinning rust (aka Winchester drives.) On SSD it is the norm.
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@BRRABill said:
@Dashrender said:
What happens if the power supply in the server dies? You still want something to backup the cache on the controller card to cover this instance.
Ah, good point. Possibly a reason they go with the H710 then! And enterprise-class SSDs with power protection.
We've had a recent really deep dive on why enterprise class drives are a waste of money (search through the IT Discussions). Perhaps you could use a non Dell RAID controller to solve this problem?
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@BRRABill said:
@Dashrender said:
What happens if the power supply in the server dies? You still want something to backup the cache on the controller card to cover this instance.
Ah, good point. Possibly a reason they go with the H710 then! And enterprise-class SSDs with power protection.
Yes, in general with servers a RAID controller is one of the first places that I recommend making a bigger investment. The larger cache and faster CPUs of better cards, plus other features, really make a difference. Obviously battery or flash backing of your data is a big deal.
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@Dashrender said:
We've had a recent really deep dive on why enterprise class drives are a waste of money (search through the IT Discussions). Perhaps you could use a non Dell RAID controller to solve this problem?
LSI or Adaptec are the good choices. Once you go down that road, be sure to reconsider being on Dell hardware. At a minimum hit up @BradfromxByte to talk about refurbed gear.
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This is the topic regarding Consumer SSDs vs Enterprise SSDs
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@BRRABill said:
- Considering what I already have and our requirements, would it just make sense to buy a few more 7.2K drives and make a RAID 10 array out of them? Is there a huge performance difference between those two arrays? (7.2K vs. 10K both in a RAID 10.)
Do you know your IOPs requirement? You might be able to get away with four 7.2K drives in a RAID 10. Splitting into two RAID 1's as you're currently planning is actually the worst thing you can do. It ends up wasting the majority of the performance offered by the drives you install the OS on.
For this server you should install Hyper-V or Xen onto a SD card or USB stick, then run your VMs from the storage. If you have enough storage space with a RAID 1 SSD, that's probably good enough. If not, moving to a 4 drive RAID 5 on SSD would probably be the next place to look.
