construction of a new 5.5 esxi
Hello
I am currently building a new server with ESXi 5.5, something I have never done before. I installed everything and it works well, except that the machines sometimes feel a bit slow. The drive is currently connected to the motherboard, no RAID, not anything, just to get some experience. Could someone please help me clarify the following:
-J' read the ESXi itself write performance are really bad, I can confirm that when I copied some already existing virtual machines to it, it took forever to get the across a gigabit in a NAS link. I mounted the NAS via NFS to the ESXi, but when I sent a machine directly to the host through the speed converter was also very slow.
-When I take a backup using VM Eplorer I see that the disc is fast
-When I copy large files inside the guest, I see that the copy is rapid until the cache of comments is full, after performance decreases significantly
I read forums and I found that I need a RAID controller with a cache of the battery to get a better speed. In this way, the controller puts cached data. But what happens if I copy a file large enough to fill the cache on the controller, the performance goes to lower even with the sluggish?
But the thing that me perplexed the most: if I install a Windows Server on the same computer and copy large files, I see the decline in performance when I fill the windows cache, but the writing speed is still about 70 MB/s, which is acceptable to me. The native ESXi writing speed is much slower than that. What happens there, whence the difference?
Kind regards
Krisztián
Thanks to all who tried to help me. Conclusion:
I hooked another solo drive in the small RAID LSI controller I have in one of the PCI slots, moved the files of virtual machine and I got the following result:
[root@leo ~] # dd if = / dev/zero of =. / teszt1G bs = 1 count = 1 oflag direct = G
records 1 + 0
1 + 0 records out
1073741824 bytes (1.1 GB) copied, 12.032 s, 89.2 MB/s
[root@leo ~] #.
Which is more than satisfactory. Something is fishy with the drive or the controller on the motherboard.
Krisztián
Tags: VMware
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