Date: Mon, 20 Apr 2020 14:11:43 +0300 From: Lev Serebryakov <lev@FreeBSD.org> To: freebsd-fs <freebsd-fs@freebsd.org> Subject: Two ZFS pools on one system: load on one pool badly affects other one Message-ID: <802e3424-7edc-8e4a-b3e6-706c2b4a197e@FreeBSD.org>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Zet3zJYk89Xq3CLGp7azNq6UCA78T7C8e Content-Type: multipart/mixed; boundary="iYes23KYdsk3U8P2CUBHNQPpD9CxedtYg" --iYes23KYdsk3U8P2CUBHNQPpD9CxedtYg Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable I have system with two ZFS pools. Both pools are RADIZ on HDDs (not SSDs= ), and don't share any storage hardware. One pool is "my private space" a= nd other one is storage for torrents. Private space contains mirrors of FreeBSD SVN, my home directory, etc. S= torage for torrents contains torrents. My home directory contains, among other data, working copies of FreeBSD = src and ports. When torrent-client is stopped, disk-depended operations on PRIVATE pool= like "svn up ~/FreeBSD/ports" starts immediately on cold caches. When torrent-client are running (and reads about 5-6MB/s in small chunks= ), "svn up ~/FreeBSD/ports" could wait up to 5 minutes before start outpu= t of updated paths. ^T shows this: load: 0.48 cmd: svn 18126 [zio->io_cv] 275.95r 3.14u 6.14s 2% 21388k Is it normal? I understand, that ARC is shared between pools, but it loo= ks like too much interaction: there are NO shared I/O resources (disks, c= ontrollers) between pools and these operations, but "svn" waits 60-300 se= conds for some condition variable! --=20 // Lev Serebryakov --iYes23KYdsk3U8P2CUBHNQPpD9CxedtYg-- --Zet3zJYk89Xq3CLGp7azNq6UCA78T7C8e Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE+W0coLX0MYtnSzMK6rA8WL/cR48FAl6dg29fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEY5 NkQxQ0EwQjVGNDMxOEI2NzRCMzMwQUVBQjAzQzU4QkZEQzQ3OEYACgkQ6rA8WL/c R493Mg//fP1KvZSSdM1/O9ULUHlHSaC8NytA8GcZAkGKJ0/bnlXXPRkDBl0Yc4b5 7KSoK8b0k92rTPoFJHjOnVHA3un+1jCWunLmrU25dKL2yTBzefjcA3uOJVzgpTW5 6pqjecIN49An+iaFsRm7htrL2JTvCRVenhltd+Mwl02Uh0JPJinCGaJwAdWj+X3p qGSC0EjdjEaKp0sP6ReX8H6qgtEc9OnAUC79HjuOX9EDRXBKwKK9Rl8c9dYDL5VB Sw2IbETcKriHEMn+/Jwl0OsWsaE0McvY+c3MRdUejPH63R8qs0okS1LIwlsZuZFx 1HQ5vG45bVghQqGRrmeCRsB5q26/+/oKcQxGj/uItWRnlHqhoORtABAR/mlmFPWC v56WYf/1B02gKCOfSrV6s/AF+HYPn0rg67WDKXjeudBOtQxW9kzA4u9UZFaHlqDN N7NQ/PEYTPzrU2E+eYfyAO5/TCNtD1HJ9kt2lUBte2tLtF/0m9qN1xwjkPgNOLBZ dMDQJeVq3I6MiGtTYu6who1NAcq2Blg9fk45pn8x8d5RPGMPR4MUF4ZlscpTUiz0 ChP7GOlBBqR8UMGxavWMk9pptSAY1k0tJ5C+v/6oW/h1O8bqtwAwXTLm7YxMhpMJ 8s86e9D1i/cKtVHkGFDvK3hX6dVVGJeFoNiM0Uk5nf3wE5T/Heg= =HaJc -----END PGP SIGNATURE----- --Zet3zJYk89Xq3CLGp7azNq6UCA78T7C8e--
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