Do I really need a ZIL SLOG? Announcing the arrival of Valued Associate #679: Cesar Manara ...
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Do I really need a ZIL SLOG?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30 pm US/Eastern)FreeNAS: single-disk ZFS?FreeNAS has poor performance with write speeds under 1 MB/sHow important is the 1GB RAM per 1TB disk space rule for ZFS?Will FreeNAS/ZFS let me manage my storage this wayWhat is the best way to setup separate FreeNAS jails/plugins using separate datasets?ZFS 85% utilization barrier with the dedicated SSD Cache / Log partitionsCan ZFS cope with sudden power loss? (What events cause a pool to be irrecoverable if the disk itself hasn't failed or become unreliable)How concerned should I be about checksum errors in a ZFS mirror?Expanding a FreeNAS/ZFS pool by migrating to Storage Spaces ParityOptimal ZFS Pool configuration for a home NAS
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I'm building a NAS for home/personal use that will use ZFS (probably running FreeNAS) over a SATA SSD array. In terms of usage, I expect the system to be "idle" (not counting ZFS background stuff e.g. scrubs) more often than not, and I expect the main performance bottleneck to be the 1Gb ethernet.
I'm vaguely familiar with the ZIL, but confused about the use of a SLOG / secondary ZIL storage device.
The system is going to be on a UPS, so it's probably more likely to experience something like a kernel panic than a sudden loss of system power. Regardless, as long as it doesn't eat my pool, I'm not particularly bothered that a catastrophic event might cause the last few minute's data to be lost. (Remember, this is a home system, not something mission critical.)
In particular, is it possible to have only the primary ZIL in RAM (and what would be the "safety" impact of that)? If I don't have a dedicated SLOG device, does that mean I am forced to use the storage pool for SLOG, and what is the actual impact (both performance and wear) of that? If I do need a dedicated device, is a high-performing NVMe SSD (e.g. a modest-sized WD Black SN750) sufficient or do I really need to spend $250 on an Intel 900p?
Most of what I've been able to find says "yes, that $250 900p is absolutely vital", but don't really explain what situation I'd be in if I omit it.
nas zfs freenas
asked 11 hours ago
MatthewMatthew
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I'm building a NAS for home/personal use that will use ZFS (probably running FreeNAS) over a SATA SSD array. In terms of usage, I expect the system to be "idle" (not counting ZFS background stuff e.g. scrubs) more often than not, and I expect the main performance bottleneck to be the 1Gb ethernet.
I'm vaguely familiar with the ZIL, but confused about the use of a SLOG / secondary ZIL storage device.
The system is going to be on a UPS, so it's probably more likely to experience something like a kernel panic than a sudden loss of system power. Regardless, as long as it doesn't eat my pool, I'm not particularly bothered that a catastrophic event might cause the last few minute's data to be lost. (Remember, this is a home system, not something mission critical.)
In particular, is it possible to have only the primary ZIL in RAM (and what would be the "safety" impact of that)? If I don't have a dedicated SLOG device, does that mean I am forced to use the storage pool for SLOG, and what is the actual impact (both performance and wear) of that? If I do need a dedicated device, is a high-performing NVMe SSD (e.g. a modest-sized WD Black SN750) sufficient or do I really need to spend $250 on an Intel 900p?
Most of what I've been able to find says "yes, that $250 900p is absolutely vital", but don't really explain what situation I'd be in if I omit it.
nas zfs freenas
asked 11 hours ago
MatthewMatthew
1012
New contributor
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm building a NAS for home/personal use that will use ZFS (probably running FreeNAS) over a SATA SSD array. In terms of usage, I expect the system to be "idle" (not counting ZFS background stuff e.g. scrubs) more often than not, and I expect the main performance bottleneck to be the 1Gb ethernet.
I'm vaguely familiar with the ZIL, but confused about the use of a SLOG / secondary ZIL storage device.
The system is going to be on a UPS, so it's probably more likely to experience something like a kernel panic than a sudden loss of system power. Regardless, as long as it doesn't eat my pool, I'm not particularly bothered that a catastrophic event might cause the last few minute's data to be lost. (Remember, this is a home system, not something mission critical.)
In particular, is it possible to have only the primary ZIL in RAM (and what would be the "safety" impact of that)? If I don't have a dedicated SLOG device, does that mean I am forced to use the storage pool for SLOG, and what is the actual impact (both performance and wear) of that? If I do need a dedicated device, is a high-performing NVMe SSD (e.g. a modest-sized WD Black SN750) sufficient or do I really need to spend $250 on an Intel 900p?
Most of what I've been able to find says "yes, that $250 900p is absolutely vital", but don't really explain what situation I'd be in if I omit it.
nas zfs freenas
asked 11 hours ago
MatthewMatthew
1012
New contributor
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm building a NAS for home/personal use that will use ZFS (probably running FreeNAS) over a SATA SSD array. In terms of usage, I expect the system to be "idle" (not counting ZFS background stuff e.g. scrubs) more often than not, and I expect the main performance bottleneck to be the 1Gb ethernet.
I'm vaguely familiar with the ZIL, but confused about the use of a SLOG / secondary ZIL storage device.
The system is going to be on a UPS, so it's probably more likely to experience something like a kernel panic than a sudden loss of system power. Regardless, as long as it doesn't eat my pool, I'm not particularly bothered that a catastrophic event might cause the last few minute's data to be lost. (Remember, this is a home system, not something mission critical.)
In particular, is it possible to have only the primary ZIL in RAM (and what would be the "safety" impact of that)? If I don't have a dedicated SLOG device, does that mean I am forced to use the storage pool for SLOG, and what is the actual impact (both performance and wear) of that? If I do need a dedicated device, is a high-performing NVMe SSD (e.g. a modest-sized WD Black SN750) sufficient or do I really need to spend $250 on an Intel 900p?
Most of what I've been able to find says "yes, that $250 900p is absolutely vital", but don't really explain what situation I'd be in if I omit it.
nas zfs freenas
nas zfs freenas
asked 11 hours ago
MatthewMatthew
1012
New contributor
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 11 hours ago
MatthewMatthew
1012
New contributor
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 11 hours ago
MatthewMatthew
1012
New contributor
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 11 hours ago
MatthewMatthew
1012
asked 11 hours ago
MatthewMatthew
1012
1012
New contributor
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Matthew is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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