Possible Performance Issues because linear volume group on VMWare?
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I am running a MongoDB Cluster on a virtuel RHEL7 in VMWare. The Data Partition is on a linear striped volume Group on two virtual Disks. This Disks are on the same FC-LUN.
Write performance is ok (1.6GByte/s), but disk latency is very high (between 150 and 400ms!). Can this stripe set be an issue, because maybe the two vmdk files are not "close" to each other on the LUN? Crossing the boundary in the volume group between the two physical disks might cause longer repositioning of the disks in the SAN? Could this be better with single virtual disk instead of the two in a stripe?
Thankful for every hint!
lvm performance vmware
asked Dec 14 '17 at 12:51
WDZaphod
1
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I am running a MongoDB Cluster on a virtuel RHEL7 in VMWare. The Data Partition is on a linear striped volume Group on two virtual Disks. This Disks are on the same FC-LUN.
Write performance is ok (1.6GByte/s), but disk latency is very high (between 150 and 400ms!). Can this stripe set be an issue, because maybe the two vmdk files are not "close" to each other on the LUN? Crossing the boundary in the volume group between the two physical disks might cause longer repositioning of the disks in the SAN? Could this be better with single virtual disk instead of the two in a stripe?
Thankful for every hint!
lvm performance vmware
asked Dec 14 '17 at 12:51
WDZaphod
1
1
What's a "linear striped volume group"? I thought it was either linear or striped. As a general rule, for striping to provide any advantage the stripes must reside of distinct physical disks. Since you seem to be using some sort of hardware array you should let the array do its magic and provide the minimum possible complications at higher levels.
– AlexP
Dec 14 '17 at 13:24
Sorry for the misleading term... It's a linear volume group over two virtual disks. I know that the two virtual disks are on the same LUN, but I don't have any idea what kind of storage setup is behind. EMC DMX is the only info I have. And it's a shared environment, on this LUN are at least 6 other VMs. Write latency peaks up to 1200ms (!), average is 150-400ms. I don't have to many options, changing to a single disk VG is one of them.
– WDZaphod
Dec 14 '17 at 14:27
A linear volume over two virtual disks should be perfectly fine. I strongly suggest that you (1) find out what's the expected throughput of the array (both bandwidth and IOPS), and compare them with the observed performance, and (2) engage with a tech engineer who has in-depth knowledge of the infrastructure solution (VMware + the specific kind of storage array).
– AlexP
Dec 14 '17 at 16:25
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am running a MongoDB Cluster on a virtuel RHEL7 in VMWare. The Data Partition is on a linear striped volume Group on two virtual Disks. This Disks are on the same FC-LUN.
Write performance is ok (1.6GByte/s), but disk latency is very high (between 150 and 400ms!). Can this stripe set be an issue, because maybe the two vmdk files are not "close" to each other on the LUN? Crossing the boundary in the volume group between the two physical disks might cause longer repositioning of the disks in the SAN? Could this be better with single virtual disk instead of the two in a stripe?
Thankful for every hint!
lvm performance vmware
asked Dec 14 '17 at 12:51
WDZaphod
1
I am running a MongoDB Cluster on a virtuel RHEL7 in VMWare. The Data Partition is on a linear striped volume Group on two virtual Disks. This Disks are on the same FC-LUN.
Write performance is ok (1.6GByte/s), but disk latency is very high (between 150 and 400ms!). Can this stripe set be an issue, because maybe the two vmdk files are not "close" to each other on the LUN? Crossing the boundary in the volume group between the two physical disks might cause longer repositioning of the disks in the SAN? Could this be better with single virtual disk instead of the two in a stripe?
Thankful for every hint!
lvm performance vmware
asked Dec 14 '17 at 12:51
WDZaphod
1
asked Dec 14 '17 at 12:51
WDZaphod
1
asked Dec 14 '17 at 12:51
WDZaphod
1
asked Dec 14 '17 at 12:51
WDZaphod
1
1
1
What's a "linear striped volume group"? I thought it was either linear or striped. As a general rule, for striping to provide any advantage the stripes must reside of distinct physical disks. Since you seem to be using some sort of hardware array you should let the array do its magic and provide the minimum possible complications at higher levels.
– AlexP
Dec 14 '17 at 13:24
Sorry for the misleading term... It's a linear volume group over two virtual disks. I know that the two virtual disks are on the same LUN, but I don't have any idea what kind of storage setup is behind. EMC DMX is the only info I have. And it's a shared environment, on this LUN are at least 6 other VMs. Write latency peaks up to 1200ms (!), average is 150-400ms. I don't have to many options, changing to a single disk VG is one of them.
– WDZaphod
Dec 14 '17 at 14:27
A linear volume over two virtual disks should be perfectly fine. I strongly suggest that you (1) find out what's the expected throughput of the array (both bandwidth and IOPS), and compare them with the observed performance, and (2) engage with a tech engineer who has in-depth knowledge of the infrastructure solution (VMware + the specific kind of storage array).
– AlexP
Dec 14 '17 at 16:25
add a comment |Â
1
What's a "linear striped volume group"? I thought it was either linear or striped. As a general rule, for striping to provide any advantage the stripes must reside of distinct physical disks. Since you seem to be using some sort of hardware array you should let the array do its magic and provide the minimum possible complications at higher levels.
– AlexP
Dec 14 '17 at 13:24
Sorry for the misleading term... It's a linear volume group over two virtual disks. I know that the two virtual disks are on the same LUN, but I don't have any idea what kind of storage setup is behind. EMC DMX is the only info I have. And it's a shared environment, on this LUN are at least 6 other VMs. Write latency peaks up to 1200ms (!), average is 150-400ms. I don't have to many options, changing to a single disk VG is one of them.
– WDZaphod
Dec 14 '17 at 14:27
A linear volume over two virtual disks should be perfectly fine. I strongly suggest that you (1) find out what's the expected throughput of the array (both bandwidth and IOPS), and compare them with the observed performance, and (2) engage with a tech engineer who has in-depth knowledge of the infrastructure solution (VMware + the specific kind of storage array).
– AlexP
Dec 14 '17 at 16:25
1
1
What's a "linear striped volume group"? I thought it was either linear or striped. As a general rule, for striping to provide any advantage the stripes must reside of distinct physical disks. Since you seem to be using some sort of hardware array you should let the array do its magic and provide the minimum possible complications at higher levels.
– AlexP
Dec 14 '17 at 13:24
What's a "linear striped volume group"? I thought it was either linear or striped. As a general rule, for striping to provide any advantage the stripes must reside of distinct physical disks. Since you seem to be using some sort of hardware array you should let the array do its magic and provide the minimum possible complications at higher levels.
– AlexP
Dec 14 '17 at 13:24
Sorry for the misleading term... It's a linear volume group over two virtual disks. I know that the two virtual disks are on the same LUN, but I don't have any idea what kind of storage setup is behind. EMC DMX is the only info I have. And it's a shared environment, on this LUN are at least 6 other VMs. Write latency peaks up to 1200ms (!), average is 150-400ms. I don't have to many options, changing to a single disk VG is one of them.
– WDZaphod
Dec 14 '17 at 14:27
Sorry for the misleading term... It's a linear volume group over two virtual disks. I know that the two virtual disks are on the same LUN, but I don't have any idea what kind of storage setup is behind. EMC DMX is the only info I have. And it's a shared environment, on this LUN are at least 6 other VMs. Write latency peaks up to 1200ms (!), average is 150-400ms. I don't have to many options, changing to a single disk VG is one of them.
– WDZaphod
Dec 14 '17 at 14:27
A linear volume over two virtual disks should be perfectly fine. I strongly suggest that you (1) find out what's the expected throughput of the array (both bandwidth and IOPS), and compare them with the observed performance, and (2) engage with a tech engineer who has in-depth knowledge of the infrastructure solution (VMware + the specific kind of storage array).
– AlexP
Dec 14 '17 at 16:25
A linear volume over two virtual disks should be perfectly fine. I strongly suggest that you (1) find out what's the expected throughput of the array (both bandwidth and IOPS), and compare them with the observed performance, and (2) engage with a tech engineer who has in-depth knowledge of the infrastructure solution (VMware + the specific kind of storage array).
– AlexP
Dec 14 '17 at 16:25
add a comment |Â
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1
What's a "linear striped volume group"? I thought it was either linear or striped. As a general rule, for striping to provide any advantage the stripes must reside of distinct physical disks. Since you seem to be using some sort of hardware array you should let the array do its magic and provide the minimum possible complications at higher levels.
– AlexP
Dec 14 '17 at 13:24
Sorry for the misleading term... It's a linear volume group over two virtual disks. I know that the two virtual disks are on the same LUN, but I don't have any idea what kind of storage setup is behind. EMC DMX is the only info I have. And it's a shared environment, on this LUN are at least 6 other VMs. Write latency peaks up to 1200ms (!), average is 150-400ms. I don't have to many options, changing to a single disk VG is one of them.
– WDZaphod
Dec 14 '17 at 14:27
A linear volume over two virtual disks should be perfectly fine. I strongly suggest that you (1) find out what's the expected throughput of the array (both bandwidth and IOPS), and compare them with the observed performance, and (2) engage with a tech engineer who has in-depth knowledge of the infrastructure solution (VMware + the specific kind of storage array).
– AlexP
Dec 14 '17 at 16:25