[zfs-discuss] General Questions on ARC & L2ARC
pandu at poluan.info
Thu Aug 29 00:57:25 EDT 2013
I'm quite new to ZFS, but even then already love it to death -- had some
brushes with disaster that were averted by a timely 'zfs rollback', and now
my boss loves ZFS, too :-)
I hope I don't come across as an annoying newb, but I have several
questions around ARC & L2ARC.
1. Since ZFS' ARC might fell victim to Linux memory fragmentation , what
if I just set zfs_arc_min = zfs_arc_max ? Won't that cause the ARC to stay
at a fixed size, hence not affected by memory fragmentation issue as the
zfs module can allocate the ARC memory since boot?
2. I have also read several times in this forum/group about employing ZRAM
for L2ARC. On benefit mentioned in  is that L2ARC size is constant, so
it will not cause 'gotchas' like what happens when ARC baloons in size. But
I've searched and yet to find a comprehensive analysis on this strategy's
benefits vs drawbacks. Can someone point me to such resource and/or provide
me with one?
Thank you very much for your assistance.
 "ZFS consuming twice ARC's size and crashing system"
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