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| ▲ | drewg123 11 hours ago | parent | next [-] |
| Solaris had a unified page cache, and ARC existed separately, along side of it there as well. One huge problem with ZFS is that there is no zero copy due to the ARC wart. Eg, if you're doing sendfile() from a ZFS filesystem, every byte you send is copied into a network buffer. But if you're doing sendfile from a UFS filesystem, the pages are just loaned to the network. This means that on the Netflix Open Connect CDN, where we serve close to the hardware limits of the system, we simply cannot use ZFS for video data due to ZFS basically doubling the memory bandwidth requirements. Switching from UFS to ZFS would essentially cut the maximum performance of our servers in half. |
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| ▲ | johannes1234321 11 hours ago | parent | prev | next [-] |
| Even on Solaris the ARC existed. ZFS replaces a lot of systems traditionally not directly related to a Filesystem implementation. For instance using the `zfs` tool one wouldn't only configure file system properties, but also control NFS exports, which traditionally was done using /etc/exports. |
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| ▲ | p_l 4 hours ago | parent [-] | | This was done as part of major UI/UX reshaping in Solaris 10 to make sysadmin lives easier, what it ultimately does is... Edits exports file.. ZFS and ZPOOL tools provide accesses to multiple different subsystems in ways that make more sense to end user, a lot like LVM and LUKS do on top of device mapper these days |
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| ▲ | goku12 11 hours ago | parent | prev | next [-] |
| Can you elaborate the last paragraph? In what way doesn't zfs fit? (I couldn't make it out from the first two paragraphs.) Where did btrfs fall short of your expectations? Why would you avoid zfs on general purpose machines if you deem it good enough for file servers? |
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| ▲ | goku12 3 hours ago | parent [-] | | @arghwhat: To clarify, this isn't a rhetorical question. I'm interested in your technical insight on the subject - especially the comparisons. |
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| ▲ | pmarreck 9 hours ago | parent | prev [-] |
| I've been booting off ZFS-on-root for years. |
