Tag Archive: SSD


New Lab / NAS

Far too long since the last post. Let’s hope this will be the start of them picking back up again!

I have been experiencing some performance issues and need to have a bit of a re-shuffle of the servers/network (my vCenter appliance has stopped working, SQL is being slow etc). I have some production stuff running and don’t want to take everything offline for long so decided to build a new environment then migrate stuff.

I wont be changing much; 

Old NAS; Synology DiskStation 1812+ w/
-4x 3TB WD Green in Synology Hybrid Raid (SHR) : Main data store for Movies, PVR Recordings, ISOs, Photos etc (CIFS & NFS)
-2x 256GB OCZ Vertex4 SSD in RAID0 : Virtual machine storage (NFS)
-2x1gbit LACP to switch
Old ESXi Host; SuperMicro X8SIL-F w/ Xeon X3470 & 16GB RAM running VMWare ESXi v5.1
Old switch; Linksys SRW2024W

New NAS; Snology DiskStation 1813+ w/
-3x 4TB WD Red in Synology Hybrid Raid (SHR) : Main data store for Movies, PVR Recordings, ISOs, Photos etc (CIFS & NFS)
-3/4?x 250GB Samsung EVO 840 SSD in RAID0? : Virtual machine storage (NFS/iSCSI?)
-3x1gbit LACP to switch dedicated to main data store
-1gbit to switch dedicated to VM storage
New ESXi Host; SuperMicro X8SIL-F w/ Xeon X3470 & 32GB RAM running VMWare ESXi v5.5
New switch; Cisco SG200-26 (separate vm storage traffic on it’s own VLAN/subnet)

You’ll notice a bunch of questions marks around the new Virtual machine storage volume. I’m currently debating which disk configuration to use and which storage protocol. I’ve always used NFS as it seems much simpler but understood iSCSI to be the better option (especially with the Synology supporting VAAI hardware acceleration). But despite this, i’ve been reading that NFS seems to outperform iSCSI.

Additionally, if I go iSCSI I will try using 2x1gbit ports and enabling multipathing / round-robin. If I go down the NFS route I don’t think LACP will provide any benefit as the IP hash from a single ESXi host to the single DiskStation will always use the same link?

I have 4 of the EVO SSD so am initially creating a 2 disk RAID0 volume using NFS and an identical volume using iSCSI. I can then try running some like for like comparisons/benchmarks to determine which configuration to use going forward.

I will provide an update shortly.

It has been far too long since I blogged. Work has been keeping me busy 7 days a week but here’s a quick post about a recent challenge.

I have been working on several data migration projects and have been struggling in general with sluggish SQL query performance. Most of the research conducted has suggested the primary bottleneck is disk IO (rather than throughput or CPU speed) so I decided to try and find the fastest "reasonably priced" SSD to give me a boost. I found this list http://www.storagesearch.com/ssd-fastest.html and after research each of the items (for availability and cost) I chose the OCZ Revodrive3 X2 PCI-e SSD.

I ordered the SSD and installed it in one of my spare servers (SuperMicro X8SIL-F, Intel X3470, 16GB Kingston RAM). Despite not being listed on the OCZ compatibly list http://www.ocztechnology.com/displaypage.php?name=revodrive_moboguide the SSD was detected during post. Again, despite being listed as only compatible with Windows 7, the SSD was detected in Windows 2008 R2 and after installing the driver and initialising the disk in Server Manager appeared in "My Computer".

Unfortunately after installing SQL Server 2008 R2 and loading a few database up the machine mysteriously restarted and no longer was the drive listed in "My Computer" or device manager. After further reboots the SSD was no longer showing during post (various green and blue LEDs were still lit so it wasn’t completely dead). I tried the card in an old Dell 9150 I had kicking around- nothing. Then a spare HP Microserver N36L- again, nothing.

Fairly convinced now that the SSD had died I called eBuyer up and started the RMA ball rolling along with placing an order for a new card (this was Thursday night and fortunately they were able to guarantee Saturday delivery). I also ordered a motherboard from the compatibility list- ASRock Z68 Extreme4 Gen3, an Intel i7 Quad-Core 2600 3.4GHz Sandy Bridge processor, and 16GB DDR3 RAM along with a no-name case all from Amazon (again, with the guarantee of Saturday delivery).

I put everything together and fired it up:

One of the first things I noticed was the different number of chips present on each of the SSD boards (compare this to the one at the top of the post?). But regardless, the replacement was working and still going strong after 24hrs solid use.

Keeping an eye on various counters in Windows I’ve seen the card reach over 1000MB/sec- impressive! And no longer does the disk seem to be the bottleneck, it now appears to be the CPU- doh! Unfortunately it looks like some queries only utilise a single processor core so the CPU is actually only 12.5% utilised.

That’s all for now! It looks like I was just very unfortunate with the first card but the replacement is blindingly fast and a great price (especially when compared with the competition).

L

My New MacBook Pro

I resisted for a short while after the new MacBook Pro was released (feb 2011) but couldn’t resist when someone sent me a 15% off voucher for BestBuy. On top of this I already get 8% cashback through quidco and a further 1% through my egg credit card :)

I went for the 15″ core i7 2.2GHz (the 13″ is a bit small for some of the video/photo editing I do, but the 17″ is a little big for on the train etc). Unfortunately BestBuy don’t do the options (SSD, AntiGlare screen etc) but I ordered 8GB of ram direct from Crucial dirt cheap and a Kingston 128GB SSD from eBuyer which i’m going to put in place of the optical drive (I barely use cd/dvd these days- mostly blu-ray so i carry a slim USB external drive anyway).

I put my old 2008 MacBook Pro on eBay and dug the original receipt out- it’s dated almost exactly 3years ago (definitely the longest a computer has lasted me)- it sold for just over half the original price I paid (which went toward half of the new one :)

Anyway- so far, so good- and no doubt i’ll be blogging about the amazing performance boost I see when the SSD gets delivered.

L

%d bloggers like this: