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
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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
New contributor
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
New contributor
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
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