Re: Write performance - Raid 1 or 5?
- From: "Juan Perez" <pgjuan3@xxxxxxxxxxx>
- Date: Mon, 15 May 2006 11:16:30 +0100
Hi:
That is for sure. In Raid 1 all you have is two HDDs were you transfer in
information and almost at the same in written without any delay.
In RAID 5 you have a minimun of 3 HDD, were you 1st you transfer the
information to three devices and later you hace to do some calculation, I
am talking in aRAID by hardware, or CRC in order to keep the info in a safe
way. If you were working with "small" files, you might not feel a big
diference. But ypu are talking about 128Gb files, and that is huge...
--
Un saludo
Juan Perez
"arno" <schoblochr@xxxxxxxxxxx> wrote in message
news:e2fYGWdaGHA.3992@xxxxxxxxxxxxxxxxxxxxxxx
Hello,
do you think that RAID 1 would be faster in writing big files than RAID
5?
I have a NAS (Allnet 6400) that I use for backup purposes, I transfer
only big files over night. I have 4 disks with Raid5, I can write files
with approx. 45Mbit/sec which I tested with robocopy. I have another
NAS which reaches 128 Mbit/sec, so network speed would allow more than
45Mbit/sec.
I tested a full Backup with 128 GByte. To a SATA drive in a PC (over
100Mbit-net) it usually takes 3.5 hours (80Mbit/sec), to the Allnet NAS
it took 6.5 hours (44 Mbit/sec), so I am wondering if the RAID Level
might be the problem. Testing is hard as it will take ages to copy data
back an forth and rebuilding the RAID (min. 12hrs).
regards
arno
.
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