Date: Sat, 15 Aug 2020 11:34:07 +0200 (CEST) From: Wojciech Puchar <wojtek@puchar.net> To: freebsd-hackers@freebsd.org Subject: gmirror balance model "prefer" doesnt work properly Message-ID: <alpine.BSF.2.20.2008151127420.18876@puchar.net>
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ada0p3 is partition on SSD, ada3p3 is partition on magnetic disk.
Geom name: root
State: COMPLETE
Components: 2
Balance: prefer
Slice: 2097152
Flags: NONE
GenID: 0
SyncID: 1
ID: 3736675121
Type: AUTOMATIC
Providers:
1. Name: mirror/root
Mediasize: 107374181888 (100G)
Sectorsize: 512
Stripesize: 4096
Stripeoffset: 0
Mode: r1w1e1
Consumers:
1. Name: ada0p3
Mediasize: 107374182400 (100G)
Sectorsize: 512
Stripesize: 0
Stripeoffset: 525139968
Mode: r1w1e1
State: ACTIVE
Priority: 1
Flags: (null)
GenID: 0
SyncID: 1
ID: 3655477467
2. Name: ada3p3
Mediasize: 107374182400 (100G)
Sectorsize: 512
Stripesize: 4096
Stripeoffset: 0
Mode: r1w1e1
State: ACTIVE
Priority: 0
Flags: NONE
GenID: 0
SyncID: 1
ID: 3836554217
according to manual reads should be preferred from device of higher
priority. i've set priority 1 for ssd, 0 for hdd. but reads are from hdd
only.
tried reverse - 0 for ssd, 1 for hdd - too reads are from hdd.
looking in code seems like it is not implemented at all
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE)
break;
}
just take first active disk.
why?
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