XS file systems
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@Dashrender said:
Is LVM a file system? or something higher than that? like the RAID layer before the file system?
LVM = Logical Volume Manager
Physical Device -> RAID Layer -> LVM -> Volume -> Filesystem
Same as on Windows. You know the Windows LVM layer as "Dynamic Disks".
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@BRRABill said:
I wonder how many Linux conversations he has per day, LOL.
Rather a lot. However a lot of them are actually Linux-triggered general conversations. Like LVM isn't a Linux thing, it's a generic OS thing that Windows Admins are often encouraged to ignore or not grok.
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@scottalanmiller said:
@Dashrender said:
Is LVM a file system? or something higher than that? like the RAID layer before the file system?
LVM = Logical Volume Manager
Physical Device -> RAID Layer -> LVM -> Volume -> Filesystem
Same as on Windows. You know the Windows LVM layer as "Dynamic Disks".
Yeah, I rarely use Dynamic Disks. In my situations it's not a common need.
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@Dashrender said:
Yeah, I rarely use Dynamic Disks. In my situations it's not a common need.
The big reason for any LVM is risk mitigation, not a need at the outset. You use it so that you are prepared for the unknown. Plus it is what normally provides for snapshots.
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@scottalanmiller said:
@Dashrender said:
Yeah, I rarely use Dynamic Disks. In my situations it's not a common need.
The big reason for any LVM is risk mitigation, not a need at the outset. You use it so that you are prepared for the unknown. Plus it is what normally provides for snapshots.
So a non VM'ed Linux machine can take a snapshot?
let me ask that another way.
A baremetal Linux box can do a snapshot if using LVM?
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@Dashrender said:
@scottalanmiller said:
@Dashrender said:
Yeah, I rarely use Dynamic Disks. In my situations it's not a common need.
The big reason for any LVM is risk mitigation, not a need at the outset. You use it so that you are prepared for the unknown. Plus it is what normally provides for snapshots.
So a non VM'ed Linux machine can take a snapshot?
let me ask that another way.
A baremetal Linux box can do a snapshot if using LVM?
Yes, this isn't a snapshot at the hypervisor level this is a snapshot below the filesystem. The windows analogy, a bad one but still, is the "previous versions" feature.
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@Dashrender said:
A baremetal Linux box can do a snapshot if using LVM?
Of course. Every enterprise has OS since the 1990s except Windows and Windows since only a little bit later than that. That was standard long before virtualization started using it in the AMD64 space.
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@coliver said:
Yes, this isn't a snapshot at the hypervisor level this is a snapshot below the filesystem. The windows analogy, a bad one but still, is the "previous versions" feature.
Windows VSS is a direct "copy" (by feature, not by implementation) of the Linux LVM system which, in turn, was a copy of the one from AIX.
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@scottalanmiller said:
@coliver said:
Yes, this isn't a snapshot at the hypervisor level this is a snapshot below the filesystem. The windows analogy, a bad one but still, is the "previous versions" feature.
Windows VSS is a direct "copy" (by feature, not by implementation) of the Linux LVM system which, in turn, was a copy of the one from AIX.
That makes more sense.
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Some systems that have had snapshots for as long as I can remember...Solaris, AIX, BSD, Linux, HP-UX and, at some point later after we had been long mocking it for lacking them, Windows. Mac is not enterprise and might have it, but I have no idea. It did at one point via ZFS but might have reverted and lost that functionality.
