3
votes
1answer
5k views

what is acceptable datastore latency on VMware ESXi host?

Looking at our performance figures on our existing VMware ESXi 4.1 host at the Datastore/Real-time performance data Write Latency Avg 14 ms Max 41 ms Read Latency Avg 4.5 ms Max 12 ms People ...
3
votes
2answers
245 views

Some consideration about Network Attached Storage (NAS) and CPU speed

(I hope that my question is not too trivial ...) I am going to choose a NAS device and I am looking for a professional NAS model. To choose correct model I am keeping in mind about network speed, ...
4
votes
4answers
19k views

Disk IO slow on ESXi, even slower on a VM (freeNAS + iSCSI)

I have a server with ESXi 5 and iSCSI attached network storage. The storage server has 4x1Tb SATA II disks in Raid-Z on freenas 8.0.4. Those two machines are connected to each other with Gigabit ...
1
vote
1answer
173 views

Performance issues with self-built NAS

I set up a little NAS system for my personal use. It's an Ubuntu system running on a fan-less Atom-powered mini ATX mainboard which I extended with a usb3 pci card to get best possible performance for ...
0
votes
2answers
94 views

Disk Throughput Terminology

Imagine running a test where you have a network-attached storage device, and there are two running processes (on different machines), reading and writing the same file on the NAS. Process 'W' does ...
-3
votes
1answer
110 views

Would a server with a NAS mounted be an issue for this? [closed]

I am writing a web app and trying to decide the best set up for this. Here is the background. The web app will be for independent film makers. The film makers will be uploading quite large movie ...
1
vote
2answers
1k views

How much performance cost for hdd encryption on NAS?

I recently purchased a NAS and it offers encryption. It is a QNAP TS459 Pro II. How much will performance be impacted if I choose to encrypt the data on the device?
0
votes
1answer
410 views

Does anyone use dm-cache?

Has, or does, anyone use dm-cache - specifically for caching SAN based storage locally? I'm looking for a way to speed up SAN based storage on a CentOS 5.6 + XEN Hypervisor which uses iSCSI mounted ...
1
vote
3answers
2k views

Performance problem with QNAP TS-410 NAS

We have a QNAP TS-410 in our office. Its hardware is: 256MB DDR2 RAM CPU Marvell 6281 800MHz 4 x 1.4GB Seagate SATA disks mounted on RAID5 We thought it would be sufficient to make backups for our ...
1
vote
2answers
2k views

How to interpret IOZone results?

Here are the resuts of running IOZone on an ext3 filesystem on an LVM volume residing on a SAN LUN (it was ran with 5 parallel processes). "Throughput report Y-axis is type of test X-axis is number ...
1
vote
1answer
621 views

Using a NAS to store user files over iSCSI/NFS?

I have an environment with servers (5-6) virtualized and hosted locally on the hypervisor. They act as file servers, so am thinking of moving the files out to a NAS (TheCUS or QNAP) and share over ...
2
votes
4answers
6k views

5400 RPM vs. 7200 RPM 2.5" Drives in RAID - Any Real Difference?

Suppose you setup 8 drives in a RAID 10 configuration using 2.5" drives using 500GB capacity each (total 2TB with RAID10 config 1TB useable). The controller (assume a typical 3ware SATA controller) ...
18
votes
17answers
21k views

What network file sharing protocol has the best performance and reliability?

We have a setup with a few web servers being load-balanced. We want to have some sort of network shared storage that all of the web servers can access. It will be used as a place to store files ...