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Is this dedi having 2 disks in raid-1?
Hi friends,
I got my dedi from volumedrive today.
I have ordered 2 x 500gb disk in software raid-1 configuration but it seems they have provided a single 1 TB drive.
here is the df -h ouput..
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md2 901G 2.0G 854G 1% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
/dev/md0 194M 35M 150M 19% /boot
further, the dd test shows a max of around 35MB/s only..
# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 30.7462 s, 34.9 MB/s
Could any one please confirm if I am given with 2 disk drives in raid-1?
Thanks for you time.
Comments
Or more likely you have two very old and slow 500GB disks in RAID0. Talk with them.
By the way to see what models your disks are, use:
Actually cat /proc/mdstat to see what is your raid setup.
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 30.7462 s, 34.9 MB/s
Check it again it's show so slow I just check our one server and get
root@dns:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 1.42211 s, 755 MB/s
root@dns:~#
@rds100 I tried your commands. But both of them are returning error as follows..
cat /proc/mdstat - what does it say?
@rds100 Here is mdstat result..
@toshost are you on ssd or raid-10? those dd results seems very good.
I did repeat dd test a few times but all of them return below 35MB/s results
SSDs. You can't get those kind of results on two SATA drives even if you're using RAID0.
I read on WHT older threads that we get around 100 - 150MB/s dd result sata disks in raid-1. But, this seems to be just too poor results here.
any one please help..
It is RAID-1 then, of two 1TB disks it seems. I wonder what disks those are though.
I am not in SSD. It's SATA Raid-1.
If it helps, here is partition info..
Tried a 2gb dd test and the results are getting worse..
do you know what hdd is that
never see any sata have that amount io
Could it be USB disk? See in dmesg what does it say about SATA or USB disks detection.
Try to install smartmontools and run this to find out what kind of disk there is in your dedicated
@smiba here is the result..
do you have any idea?
Have you tried adding -d 3ware,N as suggested?
2 things,
please run mdadm -D /dev/md2 and post the result.
And you have bitmap caching on your md2 array which will near enough kill a raid 1 array with old disks.
to take off bitmap caching run 'mdadm --grow --bitmap=none /dev/md2'
Then rerun the tests.
Thanks all..
I just noticed that, the 2 disk sizes are different as reported by fdisk.. here it is again..
I raised the issue with volumedrive support and they promised to replace the 2nd disk with another 1TB disk.
Is this the reason?
@AnthonySmith here is the result..
It could be the cause if you have miss aligned partitions as a result, please remove the bitmapping on the raid set though, it helps the rebuild speed but the other 98% of the time it just seriously slows things down.
I have just reread all of your outputs, whoever set that server up should be fired, literally no care or attention to detail at all, if you have paid anything so far for the server that time should be credited back to you.
NO
i have experience use different size disk in software raid and dont have a problem with disk I/O
@tughost and that would be fine, as long as you align everything.
What do you guys expect from Volumedrive? be happy you still have a server but you never know tomorrow lol
and @toshost do not have a dedi in volumedrive. he sounds like he is advertising in here
@vampireJ If you are refering me, I dont have any need for promoting VD here. This is my first dedi and I am only trying to understand what could be the solution to my problem.
@AnthonySmith I have turned off bitmapcaching and the results are a bit more improved..
have you test disk i/o in single disk? maybe one of your disk broken
Yeah you could break the raid and mount two single disks, never tried this though with a running and installed system. Maybe this can help you http://askubuntu.com/questions/131157/get-rid-of-software-raid
I was referring to toshost in a way advertising his products.
@niceboy aware of volumedrive's reviews before taking a dedi?
edit:
it was actually toshost that seemed to be advertising
The partitions are not aligned, it is still gong to be slow, tell them to do it properly and reset your billing.
@niceboy have they changed your hdd? and any improvement with your disk I/O now?