SAS vs SATA - what to do with all these drives!
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- Опубліковано 28 лип 2024
- SAS vs SATA - what to do with all these drives!
Lots and lots of SAS drives and testing them.
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Hello Joe, Great video. I am learning so much between you and art of server. Keep grinding away.....Ken
Thanks 👍
Enjoyed this video! Always learning something new from you. Thanks for the channel endorsement at the top of your video and for wearing the hat throughout. Have a great day UnkyJoe.
My pleasure!
Thanks for this video. I'm very interested in H310 performance difference between IR and IT mode. I look forward to seeing your next videos.
Thanks again.
My pleasure!
New light looks great!
I love it!
SAS drive SMART is different than SATA drives. They don't report attributes like SATA.
Most OSes will report SMART even on RAID controller... it's really only OSes with half baked drivers that have problems with SMART, namely FreeBSD (and hence TrueNAS/FreeNAS).
Interesting, thanks for the information, and for watching :) I am just waiting on drive trays to start playing with the other 16 SAS drives I had donated to me.
yeah I was about to say that, watching this vid really late
SAS running MAX 6Gb/s on this controller (Dual channel) and SATA MAX 3Gb/s (Single channel). SATA HDD/SSD in such a server/controller is crap.
I believe the R630/R730 models were the first Dell's to use 12Gbps on SAS. The R740/R640 definitely use 12Gbps drives
Does the raid controller in that dell server have a write cache onboard? cause that would be what gives you good numbers in the beginning. The one thing I learned about that on my x3650m4 was that if you add an SSD you need to bypass the write cache because it was actually slower than the SSD was on its own.
Greetings indeed.
@9:35 Perhaps you have to populate volume data first before it'll show those attribs in the window you were looking at? SAS6 = SATA3 as far as speeds 6g. SAS12 will be faster. The key takeaway of SAS and it's Enterprise use, is that the interface handles "2 lanes" of traffic vs SATA only handling "1 lane". If you are trying to fully utilize the SAS6, I'd recommend Enterprise SSDs. Modern twist to "on-it's-way-out-the-door" tech. I use (7200rpm - 3TB)SAS6 on a bunch of old hardware and it works great for Vault storage. I'm testing some 15k drives and I'm not impressed. They are certainly noisier. Lovin the updates. Keep the vids coming dude.
Thanks for watching :)
Heat + Electricity VS cheap SSD's in up in coming Texas heat makes since in my book!
It seems that you're hitting the SSD cache in the beginning, when the write slows down the cache is filled.
For example, Samsung 860 EVO has a cache size of
4GB LPDDR4 (4TB version)
2GB LPDDR4 (2TB version)
1GB LPDDR4 (1TB version)
512MB LPDDR4 (250/500GB versions)
I am testing the drives directly, not the ssd, drive letter P.
And ssd dram cache is generally only for FTL page table so they don't slowdown past 40-60% full
ssd's read/write data directly to nand (some ssd's do support volatilewrite cache support for write cache on the ssd but usually limited to small size to limit data loss in powerloss event)