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тАО05-16-2014 08:31 AM
тАО05-16-2014 08:31 AM
Combining SAS/SATA disks with Tiered Storage??
Is anyone doing this??
SSDs are still too expensive for us.
We will not have a huge quantity of users for a 2-node cluster in the foreseeable future...initially 35-50 growing to maybe 100-some.
We will have several databases and an email server.
I am thinking of several 15k 600 GB SAS drives as Tier 0 and several MDL/nearline SATA drives.
Comments/suggestions appreciated.
Thank you, Tom
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тАО05-16-2014 09:34 AM
тАО05-16-2014 09:34 AM
Re: Combining SAS/SATA disks with Tiered Storage??
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тАО05-19-2014 07:54 AM
тАО05-19-2014 07:54 AM
Re: Combining SAS/SATA disks with Tiered Storage??
Are your StoreVirtual units SATA only?
IMO, when running StoreVirtual, SATA should really only come into play if you're using your LUNs for long term archival purposes. Those drives tend to be bigger and slower in any case., and have the attendant problems with long RAID rebuild times.
In my cursory testing, there was not enough of a performance boost in using SAS/SATA in Tier0/Tier1, vs SATA only for this specific (archival) kind of use. But the performance was also affected by the amount of data being moved/stored during each backup that we were running. (i.e. >3TB) . The test had two 450GB 15K (R1) drives as Tier0.
So it was inefficient from a performance and a storage yield POV . i.e 450GB (SAS) vs. 6TB (SATA) for the two 3.5" disks being used.
With SSD/(SAS/SATA), the write performance gets boosted because in Tier0, as the physical RAID is usually R0 or R1 vs R5 for the Tier 1 (SAS/SATA).
If you're running SQLdatabase on your setup, depending on your LUN sizes, even the addition of a single SSD drive to each StoreVirtual unit will make a noticeable difference.
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тАО05-23-2014 01:59 AM
тАО05-23-2014 01:59 AM
Re: Combining SAS/SATA disks with Tiered Storage??
I dont think AO was ever intended to be used in a use case such as 2x 15k sas with 6x 7.2k sata.
The fact is the IOPS between the two media are going to be so poor as to kill the benefits of moving the hot data to the faster media (using -more- iops) A valid use case for AO might be 8x 200GB SSD in pool 0 and 24x 600gb SAS in pool 1.
(or something along those lines)
David Tocker
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тАО05-23-2014 05:40 AM
тАО05-23-2014 05:40 AM
Re: Combining SAS/SATA disks with Tiered Storage??
Thanks David...
Your suggestion is good if I had $3,449,344.84 to spend. :)
Wonder if it would be worthwhile with one SSD say 500 GB and 11 x 600 SAS???
Looks like I will go with 8-9 SAS and leave 3-4 bays empty, then add more disks later on...
Thank you, Tom
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тАО05-23-2014 06:53 AM
тАО05-23-2014 06:53 AM
Re: Combining SAS/SATA disks with Tiered Storage??
I wouldn't go to the extreeme that David said there, but YMMV. It doesn't appear to move data around between tiers a ton from what I can tell. The key is that you have to consider throughput, I/O capacity, and I/O latency, if your tier-0 isn't clearly suverior in all three of those categories, your benefit for having a two-tier system will be limited. I've done raid-5 set of 5 512GB SSDs and a raid-5 set of 5 2TB SATA disks for a two-node cluster (each raid set was done in hardware and presented each as a disk to the VSA) and have been pretty happy with the performance using it generally as general VM storage.
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тАО05-28-2014 02:20 AM - edited тАО05-28-2014 02:23 AM
тАО05-28-2014 02:20 AM - edited тАО05-28-2014 02:23 AM
Re: Combining SAS/SATA disks with Tiered Storage??
Bang on. (Yeah my config might have been a little over the top :) )
Still - everything should be raid (including your SSD) so perhaps a better use case would be 2x 200GB SSD, 8x 2GB 7.2K.
At the end of the day it really depends on you environment and what you can afford... I would rather a single node P4000 with everything raided than two nodes with the underlying storage unprotected...
David Tocker
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тАО05-28-2014 06:20 AM
тАО05-28-2014 06:20 AM
Re: Combining SAS/SATA disks with Tiered Storage??
for whatever its worth, I've tried desktop SSDs like the crucial M500 in raid10 and raid5 and they are great for intermittent loads, but a long-term sustained load really requires an enterprise level SSD. In my case, I'm able to get away with a raid5 group of 5 M500's on two nodes which gave me ~1.9TB usable space as a Tier0 area on a two-node cluster for under $2500.