Zfs no linux, eu estou fazendo um arquivo tar grande, estou assistindo ele adicionar ao arquivo, e ele vai muito rápido, até atingir 2.4gig de tamanho, então ele apenas rastreia, por horas.
O mesmo arquivo no ext4 não tem problema. Alguém tem alguma ideia de por que isso pode ser?
O sistema de arquivos zfs está em um vdev 1tb espelhado. Muito espaço.
zpool list z
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
z 928G 463G 465G - 28% 49% 1.00x ONLINE -
Editar: Adicionando resultados de get all e iostat ...
root@io:~# zfs get all z
NAME PROPERTY VALUE SOURCE
z type filesystem -
z creation Sat Jul 25 8:29 2015 -
z used 472G -
z available 427G -
z referenced 19K -
z compressratio 1.10x -
z mounted yes -
z quota none default
z reservation none default
z recordsize 128K default
z mountpoint /z default
z sharenfs off default
z checksum on default
z compression lz4 local
z atime on default
z devices on default
z exec on default
z setuid on default
z readonly off default
z zoned off default
z snapdir hidden default
z aclinherit restricted default
z canmount on default
z xattr on default
z copies 1 default
z version 5 -
z utf8only off -
z normalization none -
z casesensitivity sensitive -
z vscan off default
z nbmand off default
z sharesmb off default
z refquota none default
z refreservation none default
z primarycache all default
z secondarycache all default
z usedbysnapshots 0 -
z usedbydataset 19K -
z usedbychildren 472G -
z usedbyrefreservation 0 -
z logbias latency default
z dedup off default
z mlslabel none default
z sync standard default
z refcompressratio 1.00x -
z written 19K -
z logicalused 521G -
z logicalreferenced 9.50K -
z filesystem_limit none default
z snapshot_limit none default
z filesystem_count none default
z snapshot_count none default
z snapdev hidden default
z acltype off default
z context none default
z fscontext none default
z defcontext none default
z rootcontext none default
z relatime off default
z redundant_metadata all default
z overlay off default
when it's going fast.
avg-cpu: %user %nice %system %iowait %steal %idle
4.30 0.25 8.97 9.29 0.00 77.20
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 0.00 0.50 0.00 6.00 24.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 0.50 0.00 1.00 0.00 6.00 12.00 0.00 2.00 0.00 2.00 2.00 0.20
sdc 0.00 0.00 108.50 199.50 3702.50 11780.25 100.54 3.78 12.35 23.93 6.06 2.69 82.80
sdd 0.00 0.00 255.00 177.50 1930.50 10308.25 56.60 2.39 5.57 5.49 5.68 1.95 84.40
avg-cpu: %user %nice %system %iowait %steal %idle
4.00 0.13 10.98 2.98 0.00 81.92
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 0.00 0.00 401.50 0.00 1168.50 0.00 5.82 1.09 2.71 2.71 0.00 1.48 59.40
sdd 0.00 0.00 443.50 0.00 9012.00 0.00 40.64 1.70 3.83 3.83 0.00 1.31 58.00
after 2.1 gigs.
avg-cpu: %user %nice %system %iowait %steal %idle
2.41 0.00 3.99 15.76 0.00 77.85
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 0.00 4.50 0.00 20.00 8.89 0.00 0.00 0.00 0.00 0.00 0.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdc 1.00 0.00 173.00 51.00 8988.00 1645.75 94.94 3.31 14.79 17.47 5.73 4.09 91.60
sdd 2.00 0.00 357.50 36.50 21646.00 818.75 114.03 3.90 10.39 11.14 3.01 2.19 86.40
avg-cpu: %user %nice %system %iowait %steal %idle
3.17 0.00 2.09 10.71 0.00 84.03
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 7.50 0.00 1.50 0.00 40.00 53.33 0.00 2.67 0.00 2.67 2.67 0.40
sdb 0.00 28.00 0.50 13.00 2.00 162.00 24.30 0.03 1.93 0.00 2.00 1.93 2.60
sdc 2.00 0.00 360.00 0.00 22623.50 0.00 125.69 5.33 14.65 14.65 0.00 2.71 97.60
sdd 0.00 0.00 163.50 0.00 7950.25 0.00 97.25 3.46 21.17 21.17 0.00 5.83 95.40
Portanto, há muito mais leitura quando está a abrandar. Alguma ideia do porquê? Tar deveria estar escrevendo, eu acho.
Obrigado.
Tags zfs linux filesystems