------=_NextPart_000_0000_01D27555.FFA43FF0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0001_01D27555.FFA43FF0" ------=_NextPart_001_0001_01D27555.FFA43FF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi, Ii am about to migrate to a new storage. Whats the best practice in sizing? 1 big Storage Domain or multiple smaller ones? My current Setup: 11 Hosts 7 FC Storage Domains 1 TB each Can anyone tell me the pro and cons of 1 vs. many? Thx Christian ------=_NextPart_001_0001_01D27555.FFA43FF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" = xmlns:o=3D"urn:schemas-microsoft-com:office:office" = xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" = xmlns=3D"http://www.w3.org/TR/REC-html40"><head><META = HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = charset=3Dus-ascii"><meta name=3DGenerator content=3D"Microsoft Word 15 = (filtered medium)"><style><!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0cm; margin-bottom:.0001pt; font-size:11.0pt; font-family:"Calibri",sans-serif; mso-fareast-language:EN-US;} a:link, span.MsoHyperlink {mso-style-priority:99; color:#0563C1; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:#954F72; text-decoration:underline;} span.E-MailFormatvorlage17 {mso-style-type:personal-compose; font-family:"Calibri",sans-serif; color:windowtext;} .MsoChpDefault {mso-style-type:export-only; font-family:"Calibri",sans-serif; mso-fareast-language:EN-US;} @page WordSection1 {size:612.0pt 792.0pt; margin:70.85pt 70.85pt 2.0cm 70.85pt;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--></head><body lang=3DDE-AT = link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p = class=3DMsoNormal><span lang=3DEN-US>Hi,<o:p></o:p></span></p><p = class=3DMsoNormal><span lang=3DEN-US>Ii am about to migrate to a new = storage.<o:p></o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US>Whats the best practice in sizing? <o:p></o:p></span></p><p = class=3DMsoNormal><span lang=3DEN-US>1 big Storage Domain or multiple = smaller ones?<o:p></o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US>My current Setup:<o:p></o:p></span></p><p = class=3DMsoNormal><span lang=3DEN-US>11 Hosts<o:p></o:p></span></p><p = class=3DMsoNormal><span lang=3DEN-US>7 FC Storage Domains 1 TB = each<o:p></o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US>Can anyone tell me the pro and cons of 1 vs. = many?<o:p></o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US><o:p> </o:p></span></p><p class=3DMsoNormal><span = lang=3DEN-US>Thx Christian<o:p></o:p></span></p></div></body></html> ------=_NextPart_001_0001_01D27555.FFA43FF0-- ------=_NextPart_000_0000_01D27555.FFA43FF0 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There are many factors that can be discussed on this issue, two things that pop up on my mind are that many storage domains will make your Data Center be more robust and flexible, since you can maintain part of the storage domains which could help with upgrading your storage server in the future or fixing issues that might occur in your storage, without moving your Data Center to a non operational state. One storage domain is preferrable if you want to use large disks with your VMs that small storage domains does not have the capacity to do so Regards, Maor On Mon, Jan 23, 2017 at 9:52 AM, Grundmann, Christian < Christian.Grundmann@fabasoft.com> wrote:
Hi,
Ii am about to migrate to a new storage.
Whats the best practice in sizing?
1 big Storage Domain or multiple smaller ones?
My current Setup:
11 Hosts
7 FC Storage Domains 1 TB each
Can anyone tell me the pro and cons of 1 vs. many?
Thx Christian
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I know that there is a monitoring process which monitors each Storage Domain, so I guess that if you will have multiple storage domains this will make the monitor runs every time multiple times, but I think that the affect is insignificant on the Host or the Storage Domain. You should also consider the limitation of logical volumes in a volume group, IINM LVM has a default limit of 255 volumes (I'm not sure how it behaves regarding efficiency if you use more volumes) oVirt uses LV also for snapshots so with one storage domain you might get to this limit pretty quick On Mon, Jan 23, 2017 at 4:35 PM, Grundmann, Christian < Christian.Grundmann@fabasoft.com> wrote:
Hi,
thx for you input
both aren’t problems for me, all domains are from the same storage and so can’t be maintained independently.
Are there performance problems with only one Domain (like waiting for locks etc.) which I don’t have that much with multiple?
Thx Christian
*Von:* Maor Lipchuk [mailto:mlipchuk@redhat.com] *Gesendet:* Montag, 23. Jänner 2017 15:32 *An:* Grundmann, Christian <Christian.Grundmann@fabasoft.com> *Cc:* users@ovirt.org *Betreff:* Re: [ovirt-users] Storage Domain sizing
There are many factors that can be discussed on this issue,
two things that pop up on my mind are that many storage domains will make your Data Center be more robust and flexible, since you can maintain part of the storage domains which could help with upgrading your storage server in the future or fixing issues that might occur in your storage, without moving your Data Center to a non operational state.
One storage domain is preferrable if you want to use large disks with your VMs that small storage domains does not have the capacity to do so
Regards,
Maor
On Mon, Jan 23, 2017 at 9:52 AM, Grundmann, Christian < Christian.Grundmann@fabasoft.com> wrote:
Hi,
Ii am about to migrate to a new storage.
Whats the best practice in sizing?
1 big Storage Domain or multiple smaller ones?
My current Setup:
11 Hosts
7 FC Storage Domains 1 TB each
Can anyone tell me the pro and cons of 1 vs. many?
Thx Christian
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Hi Christian, Indeed, lvm adds some overhead when scanning the domains, so there is a limit around 300 lvs per domain, where each snapshot of each disk counts as a new lv. On the other hand, having too many domains can also affect on overall performance required for oVirt to manage all of them. I suggest, if you have 7 now and they work fine - try sticking to them. Or, reduce to 3 or 5 and monitor your performance. Also, afaik, there should be a lot of performance improvements coming in the new release, so try 4.1 and see. I hope this helps. Marina. On Mon, Jan 23, 2017 at 9:53 AM, Maor Lipchuk <mlipchuk@redhat.com> wrote:
I know that there is a monitoring process which monitors each Storage Domain, so I guess that if you will have multiple storage domains this will make the monitor runs every time multiple times, but I think that the affect is insignificant on the Host or the Storage Domain.
You should also consider the limitation of logical volumes in a volume group, IINM LVM has a default limit of 255 volumes (I'm not sure how it behaves regarding efficiency if you use more volumes) oVirt uses LV also for snapshots so with one storage domain you might get to this limit pretty quick
On Mon, Jan 23, 2017 at 4:35 PM, Grundmann, Christian < Christian.Grundmann@fabasoft.com> wrote:
Hi,
thx for you input
both aren’t problems for me, all domains are from the same storage and so can’t be maintained independently.
Are there performance problems with only one Domain (like waiting for locks etc.) which I don’t have that much with multiple?
Thx Christian
*Von:* Maor Lipchuk [mailto:mlipchuk@redhat.com] *Gesendet:* Montag, 23. Jänner 2017 15:32 *An:* Grundmann, Christian <Christian.Grundmann@fabasoft.com> *Cc:* users@ovirt.org *Betreff:* Re: [ovirt-users] Storage Domain sizing
There are many factors that can be discussed on this issue,
two things that pop up on my mind are that many storage domains will make your Data Center be more robust and flexible, since you can maintain part of the storage domains which could help with upgrading your storage server in the future or fixing issues that might occur in your storage, without moving your Data Center to a non operational state.
One storage domain is preferrable if you want to use large disks with your VMs that small storage domains does not have the capacity to do so
Regards,
Maor
On Mon, Jan 23, 2017 at 9:52 AM, Grundmann, Christian < Christian.Grundmann@fabasoft.com> wrote:
Hi,
Ii am about to migrate to a new storage.
Whats the best practice in sizing?
1 big Storage Domain or multiple smaller ones?
My current Setup:
11 Hosts
7 FC Storage Domains 1 TB each
Can anyone tell me the pro and cons of 1 vs. many?
Thx Christian
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
-- Thanks, Marina.
On Mon, Jan 23, 2017 at 7:33 PM, Marina Kalinin <mkalinin@redhat.com> wrote:
Hi Christian,
Indeed, lvm adds some overhead when scanning the domains, so there is a limit around 300 lvs per domain, where each snapshot of each disk counts as a new lv.
We are testing currently 1000 lvs per storage domain. It is slower than 750, I'm not sure yet how it compared to 100 or 300 lvs. But basically, the number of lvs is limited, so once the pass the limit that make the system too slow for you, you need to add a new storage domain. If you are managing less then 300 lvs, and you have don't have other reason to have multiple storage domains (e.g. separate storage servers, separate users, etc.), few storage domain is best. I don't know if having more physical devices on the host will lead to better performance, you will have to test this with your environment.
On the other hand, having too many domains can also affect on overall performance required for oVirt to manage all of them. I suggest, if you have 7 now and they work fine - try sticking to them. Or, reduce to 3 or 5 and monitor your performance. Also, afaik, there should be a lot of performance improvements coming in the new release, so try 4.1 and see. I hope this helps.
Marina.
On Mon, Jan 23, 2017 at 9:53 AM, Maor Lipchuk <mlipchuk@redhat.com> wrote:
I know that there is a monitoring process which monitors each Storage Domain, so I guess that if you will have multiple storage domains this will make the monitor runs every time multiple times, but I think that the affect is insignificant on the Host or the Storage Domain.
You should also consider the limitation of logical volumes in a volume group, IINM LVM has a default limit of 255 volumes (I'm not sure how it behaves regarding efficiency if you use more volumes) oVirt uses LV also for snapshots so with one storage domain you might get to this limit pretty quick
On Mon, Jan 23, 2017 at 4:35 PM, Grundmann, Christian <Christian.Grundmann@fabasoft.com> wrote:
Hi,
thx for you input
both aren’t problems for me, all domains are from the same storage and so can’t be maintained independently.
Are there performance problems with only one Domain (like waiting for locks etc.) which I don’t have that much with multiple?
Thx Christian
Von: Maor Lipchuk [mailto:mlipchuk@redhat.com] Gesendet: Montag, 23. Jänner 2017 15:32 An: Grundmann, Christian <Christian.Grundmann@fabasoft.com> Cc: users@ovirt.org Betreff: Re: [ovirt-users] Storage Domain sizing
There are many factors that can be discussed on this issue,
two things that pop up on my mind are that many storage domains will make your Data Center be more robust and flexible, since you can maintain part of the storage domains which could help with upgrading your storage server in the future or fixing issues that might occur in your storage, without moving your Data Center to a non operational state.
One storage domain is preferrable if you want to use large disks with your VMs that small storage domains does not have the capacity to do so
Regards,
Maor
On Mon, Jan 23, 2017 at 9:52 AM, Grundmann, Christian <Christian.Grundmann@fabasoft.com> wrote:
Hi,
Ii am about to migrate to a new storage.
Whats the best practice in sizing?
1 big Storage Domain or multiple smaller ones?
My current Setup:
11 Hosts
7 FC Storage Domains 1 TB each
Can anyone tell me the pro and cons of 1 vs. many?
Thx Christian
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
-- Thanks, Marina.
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
participants (4)
-
Grundmann, Christian -
Maor Lipchuk -
Marina Kalinin -
Nir Soffer