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Tony HudziakFlag for Ireland

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Retro Fit SSD

Hi All
Looking for your opinion, I have just upgraded a HP DL360 G7 with 2 x Intel SSD 2TB drives RAID1 also there are 2 x 1TB Sata WD Red RAID1 on the same controller. Using Proxmox hypervisor. I moved 4 VM's from a Dell PE R715 across to my HP, all working fine except I am not seeing the speed gain that I expected. Ran some drive test with HDTunePro_570 attached the results. Can see big gains only in the Access time.

Many Thanks for your Reply

Drives used
Intel SSDSC2KG019T801 SSD D3-S4610 Series 1.92TB
HP-Win10-on-SSD.jpg
DELL-R715-Win10-on-SATA-RAID10.jpg
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Alex
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So, RAID1 will reduce write times anyway, so that's a kicker.

It also depends on the model of SSD, can you please provide that, also it depends on the RAID controller, what is that. Also if you run it on the bare metal rather than in a VM, you'll also get a further increase in performance rather than benching it from a VM.

Also use AS -SSD benchmark, not HDtune https://www.techspot.com/downloads/6014-as-ssd-benchmark.html

THanks
Alex
Generally SSD drives (in most cases) write far slower than mechanical drives, so as Alex said, your considerations are...

1) If your primary workload is read, write or read/write.

2) Acceptable speed for workload.

The way I approach disk drives is to use slow, big (12TB), mechanical drives with massive main memory where almost all I/O (reads + writes) come from memory, from tuning systems like database subsystems (big buffers) + file systems (slow buffer flushing).

This approach requires good UPS support on racks where your servers run, so short power outages have no effect + long power outages (battery low indications) cause machines to power down cleanly, flushing data buffers to disk.
Implement ZFS, with many spnning rust spindles, and ZIL and ARC cache on SSD.
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ASKER

These are file print and email servers in areas where there is bad broadband not fast enough for cloud (AWS or Azure).
Am I better with 4 -6 smaller dives in RAID10 than 2 larger drives in RAID1?
RAID = DELL R715 has std Perc 6i......HP DL360 G7 has P410i
Going to try AS -SSD benchmark, will come back to you guys.
Yes, more disk  = more spindles = more IOPS = more performance

you can calculate it....

also enable Battery backup Write cache
David, where do you get your SSD’s from when you say that SSD write far slower than Mechanical drives?

Even consumer SSD’s hit write speeds of 500MB/s, but even the fastest enterprise spinning rust disks struggle to beat 200MB/s
Only way to know actual read/write speed is to refer to your SSD specs.
I am not sure what your point is?

do I believe marketing numbers in device spec sheets, or real life numbers from benchmarking software?
Which ever way you look at it SSD’s always come out on top, yes you can get some really good peak numbers out of some HDD’s but they cannot sustain it, and when it comes to IOPS it’s a case of <300 v 30K(a consumer SSD)
OK so the AS SSD Benchmark really shows the speed of the SSD drives and runs in 5 min on the SSD partition, takes near 20min to run on the SATA partition on the same box, both of these partitions SSD & SATA are in the same server, same RAID controller.
HP SATA 16 7 & 27
HP SSD 220 97 & 420
I was sure that the HP P410i would be the bottleneck, as it's would not be optimised for an SSD
I did check that all Firmware and BIOS were up to date on the HP, so that may of helped.
Those Dell (PE R715) numbers are from the server that was in play while I rebuilt the HP, same VM's just slid across to the HP.
AS-SSD-HP-DL360-VM-on-SATA.jpg
AS-SSD-HP-DL360-VM-on-SSD.jpg
As-SSD-DELL-R715-Win10-on-SATA-RAID1.jpg
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