Date: Wed, 8 Nov 2017 14:39:51 +0100 From: Andrea Venturoli <ml@netfence.it> To: freebsd-questions@freebsd.org Subject: Maximum number of UFS snapshots Message-ID: <8453ff76-0340-16c5-35b2-341ae6367606@netfence.it>
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Hello. I read an UFS filesystem can have up to 20 snapshot. Looks like this is fixed in the kernel sources(*) and cannot be increased. (*) sys/ufs/ffs/fs.h reads: > /* > * The maximum number of snapshot nodes that can be associated > * with each filesystem. This limit affects only the number of > * snapshot files that can be recorded within the superblock so > * that they can be found when the filesystem is mounted. However, > * maintaining too many will slow the filesystem performance, so > * having this limit is a good idea. > */ > #define FSMAXSNAP 20 I wonder if this is something that can be changed. Leaving performance considerations aside, what would this imply? Inability to read previously formatted UFS filesystems? Impossibility to share UFS filesystems with other machines? Superblock growing beyond its maximum size? Anything else? bye & Thanks av. P.S. This is mainly out of curiosity. Although such a FS would fit my needs, I'm not reckless enough to try this in production :)
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